AZRX AzurRx BioPharma Inc

We are offering (i) 1,650,000 shares of our common stock and (ii) Series C Warrants to purchase up to an aggregate of 6,498,195 shares of our common stock (“Series C Warrants”). Each share of common stock is being sold together with one warrant to purchase one share of our common stock. The Series C Warrants are exercisable immediately upon issuance at an exercise price of $1.26 per share and expire five years from the date of issuance. The shares of common stock and Series C Warrants will be issued separately. This prospectus also covers the shares of common stock issuable upon the exercise of the warrants being offered.

We are also offering prefunded warrants (the “Prefunded Warrants”) to purchase up to an aggregate of 4,848,195 shares of common stock to investors whose purchase of shares of common stock in this offering would otherwise result in such purchasers, together with their affiliates and certain related parties, beneficially owning more than 4.99% (or, at the election of the purchasers, 9.99%) of our outstanding shares of common stock immediately following the closing of this offering. Subject to limited exceptions, a holder of Prefunded Warrants will not have the right to exercise any portion of its Prefunded Warrants if the holder, together with its affiliates, would beneficially own in excess of 4.99% (or, at the election of the purchasers, 9.99%) of the number of shares of common stock outstanding immediately after giving effect to such exercise. This offering also relates to the shares of common stock issuable upon exercise of any Prefunded Warrants sold in this offering. Each Prefunded Warrant is immediately exercisable for one share of common stock at an exercise price of $0.01 per share and may be exercised at any time until exercised in full. The Series C Warrants and the Prefunded Warrants are referred to collectively as the warrants.

Our common stock is listed on The Nasdaq Capital Market under the symbol “FWBI”. The last reported sale price of our common stock on February 25, 2022, was $1.26 per share.

There is no established trading market for any of the warrants, and we do not expect a market to develop. We do not intend to apply for a listing for any of the warrants on any securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of the warrants will be limited.

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page S-6 of this prospectus supplement.

We engaged H.C. Wainwright & Co., LLC to act as our exclusive placement agent in connection with this offering. The placement agent is not purchasing the securities offered by us in this offering and is not required to arrange the purchase or sale of any specific number or dollar amount of securities, but will use its reasonable best efforts to arrange for the sale of the securities offered.

We expect that delivery of the securities being offered pursuant to this prospectus supplement and the accompanying prospectus will be made on or about March 2, 2022, subject to the satisfaction of certain customary closing conditions.

Neither the Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement and the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

Although our common stock is currently listed on the Nasdaq Capital Market, there is limited trading activity. We can give no assurance that an active market will develop, or if developed, that it will be sustained. If an investor acquires shares of our common stock, the investor may not be able to liquidate our shares should there be a need or desire to do so.

Because the effective offering price per common share and warrant is higher than the as adjusted net tangible book value per share of common stock after giving effect to this offering, you will suffer immediate and substantial dilution in the net tangible book value of the securities you purchase in this offering. For a further description of the dilution that investors in this offering will experience, see “Dilution.”

In the event that holders of our outstanding warrants, stock options and convertible preferred stock exercise or convert their securities into our common stock, you will suffer additional dilution in your investment.

Because the expected net proceeds of this offering are not sufficient for our company to regain and maintain compliance with Nasdaq’s continued listing requirements, we will be required to raise additional equity capital prior to May 25, 2022 to maintain our Nasdaq listing. In addition, we may raise additional equity capital above the amount required to satisfy Nasdaq’s continued listing requirements as we have incurred recurring losses, negative operating cash flows and require significant cash resources to execute our business plan. To raise additional capital, we may offer additional shares of our common stock or other securities convertible into or exchangeable for our common stock at prices that may not be the same as the effective offering price per share of common stock in this offering. We may sell shares or other securities in any other offering at a price per share that is less than the effective offering price per share paid by investors in this offering, and investors purchasing shares or other securities in the future could have rights superior to existing stockholders. The price per share at which we sell additional shares of our common stock, or securities convertible or exchangeable into common stock, in future transactions may be higher or lower than the price per share paid by investors in this offering (on a fully-converted basis). Furthermore, sales of a substantial number of shares of our common stock in the public markets, or the perception that such sales could occur, could depress the market price of our common stock.

There is no established public trading market for the warrants being offered in this offering, and we do not expect a market to develop. In addition, we do not intend to apply to list such warrants on any national securities exchange or other nationally recognized trading system, including the Nasdaq Capital Market. Without an active market, the liquidity of the warrants will be limited.

The Series C Warrants being offered by us in this offering have an exercise price of $1.26 per share and expire five and one-half years from the original issuance date. In the event that the market price of our common stock does not exceed the exercise price of the Series C Warrants during the period when they are exercisable, the Series C Warrants may not have any value.

If you acquire warrants to purchase shares of our common stock in this offering, you will have no rights with respect to our common stock until you acquire shares of such common stock upon exercise of your warrants. Upon exercise of your warrants, you will be entitled to exercise the rights of a common shareholder only as to matters for which the record date occurs after the exercise date.

We will have considerable discretion in the application of the net proceeds of this offering, including for any of the purposes described in the section entitled “Use of Proceeds.” We intend to use the net proceeds received by us

from this offering to fund the remaining cash portion of the purchase price for the First Wave Acquisition and for other general corporate purposes, which may include product manufacturing, clinical development and/or increases in working capital. We may choose not to apply any of the net proceeds of the offering for the purposes described above, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. As a result, investors will be relying upon management’s judgment with only limited information about our specific intentions for the use of the net proceeds of this offering. We may use the net proceeds for purposes that do not yield a significant return or any return at all for our stockholders. In addition, pending their use, we may invest the net proceeds from this offering in a manner that does not produce income or that loses value.

You may be unable to sell your shares of common stock at or above the offering price. The market price for our common stock has been and may continue to be volatile and subject to wide fluctuations in response to factors including the following:

Many of these factors are beyond our control. The stock markets in general, and the market for pharmaceutical and biotechnological companies in particular, have historically experienced extreme price and volume fluctuations. These fluctuations often have been unrelated or disproportionate to the operating performance of these companies. These broad market and industry factors could reduce the market price of our common stock, regardless of our actual operating performance.

Our operations have consumed substantial amounts of cash since inception. During the years ended December 31, 2020 and 2019, we incurred total losses of approximately $32.8 million and $15.3 million,

respectively. During the nine months ended September 30, 2021 and 2020, we incurred total losses of $47.5 million and $15.2 million. We have outstanding payment obligations related to the First Wave Acquisition of installments of $500,000 per month payable through August 2022 and $1.0 million per month payable from September 2022 through July 2023 for an aggregate outstanding amount of $14.0 million. We expect to continue to spend substantial amounts on product development, including conducting clinical trials for niclosamide and adrulipase and purchasing clinical trial materials from our suppliers. We will require substantial additional funds to support our continued research and development activities, as well as the anticipated costs of preclinical studies and clinical trials, regulatory approvals and potential commercialization. We could spend our available financial resources much faster than we currently expect.

Until such time, if ever, as we can generate a sufficient amount of product revenue and achieve profitability, we expect to seek to finance future cash needs through equity and/or debt financings or corporate collaboration and licensing arrangements. We currently have no other commitments or agreements relating to any of these types of transactions and we cannot be certain that additional funding will be available on acceptable terms, or at all. If we are unable to raise additional capital, we will have to delay, curtail or eliminate one or more of our research and development programs. If we are able to raise additional capital, our stockholders may experience additional dilution, and as a result, our stock price may decline.

Provisions of our restated certificate of incorporation, our restated by-laws and Delaware law may have the effect of deterring unsolicited takeovers or delaying or preventing a change in control of our company or changes in our management, including transactions in which our stockholders might otherwise receive a premium for their shares over then current market prices. In addition, these provisions may limit the ability of stockholders to approve transactions that they may deem to be in their best interests. These provisions include:

In addition, Section 203 of the Delaware General Corporation Law prohibits a publicly-held Delaware corporation from engaging in a business combination with an interested stockholder, generally a person which together with its affiliates owns, or within the last three years, has owned 15% of our voting stock, for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner.

The existence of the foregoing provisions and anti-takeover measures could limit the price that investors might be willing to pay in the future for shares of our common stock. They could also deter potential acquirers of our company, thereby reducing the likelihood that you could receive a premium for your common stock in an acquisition.

Since we are no longer an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012, we are no longer able to take advantage of certain exemptions from various reporting requirements that were previously available to us, but which were not available to other public companies that are not emerging growth companies. Accordingly, we will be required to comply with increased disclosure obligations regarding executive compensation in our periodic reports and proxy statements and the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. As a result, we will incur greater expenses associated with such reporting requirements. These expenses would further increase if we ceased to be a “smaller reporting company.” In addition, if we are deemed an accelerated filer or large accelerated filer in the future, we expect to incur additional management time and cost to comply with the more stringent reporting requirements applicable to companies that are deemed accelerated filers or large

accelerated filers, including complying with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act. We have not yet completed the process of compiling the system and processing documentation needed to comply with such requirements. We may not be able to complete our evaluation, testing and any required remediation in a timely fashion when required to do so. In that regard, we currently do not have an internal audit function, and we will need to hire or contract for additional accounting and financial staff with appropriate public company experience and technical accounting knowledge.

Our management and other personnel need to devote a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costly. We cannot predict or estimate the amount of additional costs we may incur as a result of this.

Under Rule 12b-2 of the Exchange Act, a “smaller reporting company” is a company that is not an investment company, an asset-backed issuer or a majority-owned subsidiary of a parent company that is not a smaller reporting company, and, according to the amended definition effective September 10, 2018, had a public float of less than $250 million as of the last business day of its most recently completed second fiscal quarter or, if such public float is less than $700 million, had annual revenues of less than $100 million during the most recently completed fiscal year. Smaller reporting companies are permitted to provide simplified executive compensation disclosure in their filings; and they have certain other decreased disclosure obligations in their SEC filings, including, among other things, only being required to provide two years of audited financial statements in annual reports. We qualify as a smaller reporting company. For as long as we continue to be a smaller reporting company, we expect that we will take advantage of the reduced disclosure obligations available to us as a result of those respective classifications. Decreased disclosure in our SEC filings as a result of our having availed ourselves of scaled disclosure may make it harder for investors to analyze our results of operations and financial prospects.

The trading market for our shares is influenced by the research and reports that industry or securities analysts publish about us or our business. We do not have any control over these analysts. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, we could lose visibility in the financial markets, which in turn could cause our share price or trading volume to decline. Moreover, if one or more of the analysts who cover us downgrade our stock, or if our results of operations do not meet their expectations, our share price could decline.

Our Board has the authority to fix and determine the relative rights and preferences of preferred stock. Our Board also has the authority to issue preferred stock without further stockholder approval.

We currently have approximately 662.25 shares of Series B Preferred Stock outstanding with a stated value of $7,700 per share, which are currently convertible at the holder’s option at any time, together with any accrued but unpaid dividends thereon, into shares of common stock at a conversion price of $7.70 per share, subject to certain adjustments.

Our Series B Preferred Stock gives its holders the preferred right to our assets upon liquidation and the right to receive dividend payments at 9.00% per annum before dividends are distributed to the holders of common stock, among other things. In addition, in the event we effect any issuance of common stock or common stock equivalents for cash consideration, or a combination of units thereof, the holders of the Series B Preferred Stock have the right, subject to certain exceptions, at their option, to exchange (in lieu of cash subscription payments) all or some of the Series B Preferred Stock then held (with a value per share of the Series B Preferred Stock equal to the Series B stated value per share, or $7,700.00, plus accrued and unpaid dividends thereon) for any securities or units issued in such

issuance on a dollar-for-dollar basis. The holders of the Series B Preferred Stock, voting as a separate class, also have customary consent rights with respect to certain corporate actions, including the issuance of an increased number of shares of Series B Preferred Stock, the establishment of any capital stock ranking senior to or on parity the Series B Preferred Stock as to dividends or upon liquidation, the incurrence of indebtedness, and certain changes to our Charter or Bylaws including other actions.

Our Board created a series of preferred stock designated as Series C Preferred Stock (“Series C Preferred Stock”), of which 57,000 shares are authorized for issuance, none of which are currently outstanding. Pursuant to the Series B Exchange Right, we may be required to issue shares of Series C Preferred Stock in certain circumstances. For a description of the terms of our Series C Preferred Stock, see “Description of Capital Stock – Preferred Stock – Series C Preferred Stock” in the accompanying prospectus.

Our obligations to the holders of the Series B Preferred Stock and any future holders of any additional series of preferred stock we may issue could limit our ability to obtain additional financing or increase our borrowing costs, which could have an adverse effect on our financial condition and hinder the accomplishment of our corporate goals.

In addition to the Series B Preferred Stock and Series C Preferred Stock, our Board could authorize the issuance of additional series of preferred stock with such rights preferential to the rights of our common stock, including the issuance of a series of preferred stock that has greater voting power than our common stock or that is convertible into our common stock, which could decrease the relative voting power of our common stock or result in dilution to our existing stockholders.

On July 16, 2020, we consummated a private placement offering (the “Series B Private Placement”) in which we issued an aggregate of approximately 2,912.58 shares of Series B Preferred Stock, at a price of $7,700.00 per share, initially convertible into an aggregate of 2,912,509 shares of common stock at $7.70 per share, together with warrants to purchase an aggregate of 1,456,209 shares of common stock at an exercise price of $8.50 per share. The Series B Preferred Stock carries a cumulative dividend at a rate of 9.0% per annum, payable at our option either in cash or in kind in additional shares of Series B Preferred Stock. As a result of previous conversions and exchanges, as of February 18, 2022, 662.25 shares of Series B Preferred Stock were outstanding, with an aggregate stated value of approximately $5,100,000, plus accrued and unpaid dividends through such date of approximately $519,000, and a conversion price of $7.70 per share.

Under the Series B Certificate of Designations, in the event we effect any issuance of common stock or common stock equivalents for cash consideration, or a combination of units thereof (a “Subsequent Financing”), each holder of the Series B Preferred Stock has the right to exchange the stated value, plus accrued and unpaid dividends, of the Series B Preferred Stock for any securities issued in the Subsequent Financing, in lieu of any cash subscription payments therefor (the “Series B Exchange Right”). As a result of our registered direct offering and private placement consummated in January 2021, as of February 18, 2022, we may be required to issue in the aggregate up to 7,491.51 additional shares of Series C Preferred Stock that would be convertible into up to 749,124 underlying shares of common stock, together with warrants to purchase up to an additional 749,124 shares of our common stock, to any holders of Series B Preferred Stock who elect to exercise their Series B Exchange Right in connection with that offering. Alternatively, as a result of sales of additional shares of common stock made on November 30, 2021, at a price of $2.1657 per share, pursuant to our At The Market Agreement dated May 26, 2021 (the “ATM Agreement”) (such price being the lowest price per share sold under the ATM Agreement to date), as of February 18, 2022, we may be required to issue in aggregate up to 2,148,011 shares of common stock, with no warrants, to any holders of Series B Preferred Stock who elect to exercise their Series B Exchange Right into shares of common stock. In any event, we anticipate that we would convert any shares of Series C Preferred Stock to be issued pursuant to the Series B Exchange Right into underlying shares of common stock immediately upon issuance.

Between February 1 and February 7, 2022, we entered into Waivers with certain holders of Series B Preferred Stock, pursuant to which we agreed to pay a cash waiver fee equal to ten percent of the stated value of the shares of Series B Preferred Stock held by such holder (other than holders who are insiders of our company), and such holder agreed to irrevocably waive its Series B Exchange Right with respect to any Subsequent Financing that occurs from and after the date of the Waiver until December 31, 2022. However, as of February 18, 2022, holders of Series B

Preferred Stock holding approximately $2.21 million of stated value of the shares of Series B Preferred Stock outstanding did not enter into a Waiver with us. Accordingly, such non-waiving holders may exercise their Series B Exchange Right in connection with this offering.

To raise additional capital, we may in the future offer additional shares of common stock or other securities convertible into or exchangeable for our common stock at prices and other terms that may be more favorable to investors than the terms of our prior offerings that may have been previously approved by our stockholders. As a result, holders of Series B Preferred Stock may become entitled to exercise their Series B Exchange Right in connection with that future offering. This may result in certain dilution to our stockholders and could afford our stockholders a smaller percentage interest in our voting power, liquidation value and aggregate book value. The existence of the Series B Exchange Right may make it more difficult for us to consummate future offerings of our securities at a time and a price that we deem appropriate and may trigger the obligation for the Company to obtain stockholder approval in connection with our future offerings under certain Nasdaq Listing Rules and related guidance.

These forward-looking statements are only predictions and we may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, so you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. We have based these forward-looking statements largely on our current expectations and projections about future events and trends that we believe may affect our business, financial condition and operating results. We have included important factors in the cautionary statements included in this prospectus supplement, as well as certain information incorporated by reference into this prospectus supplement and the accompanying prospectus, that could cause actual future results or events to differ materially from the forward-looking statements that we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make.

Discussions containing these forward-looking statements may be found, among other places, in the sections titled “Business,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” incorporated by reference from our most recent Annual Report on Form 10-K for the fiscal year ended December 31, 2020 and our most recent Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2021, as well as any amendments thereto, filed with the SEC. Additional factors are discussed under the caption “Risk Factors” in this prospectus supplement, the accompanying prospectus and any free writing prospectus we authorize for use in connection with this offering and under similar headings in the other documents that are incorporated by reference into this prospectus supplement. New risks and uncertainties arise from time to time, and it is impossible for us to predict these events or how they may affect us. We disclaim any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required by law.

You should read this prospectus supplement, the accompanying prospectus and any free writing prospectus we authorize for use in connection with this offering with the understanding that our actual future results may be materially different from what we expect. We do not assume any obligation to update any forward-looking statements whether as a result of new information, future events or otherwise, except as required by applicable law.

In this offering, we are offering shares of our common stock, Series C Warrants to purchase shares of our common stock, and Prefunded Warrants to purchase shares of common stock (and the shares of common stock issuable from time to time upon exercise of the warrants). No fractional warrants will be issued.

The material terms and provisions of our common stock and each other class of our securities that qualifies or limits our common stock are described under the caption “Description of Our Capital Stock” in the accompanying prospectus. On January 14, 2022, our stockholders approved an amendment to our Amended and Restated Certificate of Incorporation increasing the authorized number of shares of our common stock to 50,000,000 shares, which increase was effected on such date. Our common stock is listed on the Nasdaq Capital market under the symbol “FWBI”. Our transfer agent is Colonial Stock Transfer Company, Inc.

The following is a summary of the material terms and provisions of the Series C Warrants that are being offered hereby. This summary is subject to and qualified in its entirety by the form of Series C Warrant, which has been provided to the investors in this offering and which will be filed with the SEC as an exhibit to a Current Report on Form 8-K in connection with this offering and incorporated by reference into the registration statement of which this prospectus supplement forms a part. Prospective investors should carefully review the terms and provisions of the form of the Prefunded Warrant for a complete description of the terms and conditions of the Prefunded Warrant.

The Series C Warrants offered hereby will have an exercise price of $1.26 per share. The Series C Warrants will be immediately exercisable upon issuance and will be exercisable for five years from the date of issuance. The exercise price and number of shares of common stock issuable upon exercise are subject to appropriate adjustment in the event of share dividends, share splits, reorganizations or similar events affecting our shares of common stock. Series C Warrants will be issued in certificated form only.

The Series C Warrants will be exercisable, at the option of each holder, in whole or in part, by delivering to us a duly executed exercise notice accompanied by payment in full for the number of shares of common stock purchased upon such exercise (except in the case of a cashless exercise as discussed below). A holder (together with its affiliates) may not exercise any portion of such holder’s warrants to the extent that the holder would own more than 4.99% (or, at the election of the purchaser, 9.99%) of our outstanding shares of common stock immediately after exercise, except that upon at least 61 days’ prior notice from the holder to us, the holder may increase the amount of ownership of outstanding shares of common stock after exercising the holder’s Series C Warrants up to 9.99% of the number of shares of common stock outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the Series C Warrants. Purchasers in this offering may also elect prior to the issuance of Series C Warrants to have the initial exercise limitation set at 9.99% of our outstanding shares of common stock.

Any outstanding Series C Warrants will be automatically exercised via cashless exercise on the expiration date of the Series C Warrants.

If at the time of exercise of the Series C Warrant there is no effective registration statement registering, or the prospectus contained therein is not available for the resale of the shares of common stock issuable upon exercise of the Series C Warrant, then the Series C Warrants will only be exercisable on a “cashless exercise” basis under which the holder will receive upon such exercise a net number of common shares determined according to a formula set forth in the Series C Warrants.

In the event of any fundamental transaction, as described in the Series C Warrants and generally including any merger with or into another entity, sale of all or substantially all of our assets, tender offer or exchange offer, or reclassification of our shares of common stock, then upon any subsequent exercise of a Series C Warrant, the holder

will have the right to receive as alternative consideration, for each share of common stock that would have been issuable upon such exercise immediately prior to the occurrence of such fundamental transaction, the number of shares of common stock of the successor or acquiring corporation or of our company, if it is the surviving corporation, and any additional consideration receivable upon or as a result of such transaction by a holder of the number of shares of common stock for which the Series C Warrant is exercisable immediately prior to such event. In certain circumstances, the holder will have the right to receive the Black Scholes Value of the warrant calculated pursuant to a formula set forth in the Series C Warrants, payable either in cash or in the same type or form of consideration that is being offered and being paid to the holders of our common stock as described in the Series C Warrants.

In accordance with its terms and subject to applicable laws, a Series C Warrant may be transferred at the option of the holder upon surrender of the Series C Warrant to us together with the appropriate instruments of transfer and payment of funds sufficient to pay any transfer taxes (if applicable).

No fractional shares of common stock will be issued upon the exercise of the Series C Warrants. Rather, the number of shares of common stock to be issued will, at our election, either be rounded up to the nearest whole number or we will pay a cash adjustment in respect of such final fraction in an amount equal to such fraction multiplied by the exercise price.

There is no established trading market for the Series C Warrants, and we do not expect a market to develop. We do not intend to apply for a listing for the Series C Warrants on any securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of the Series C Warrants will be limited.

Except as otherwise provided in the Series C Warrants or by virtue of the holders’ ownership of shares of common stock, the holders of Series C Warrants do not have the rights or privileges of holders of our shares of common stock, including any voting rights, until such Series C Warrant holders exercise their warrants.

The following is a summary of the material terms and provisions of the Prefunded Warrants that are being offered hereby. This summary is subject to and qualified in its entirety by the form of Prefunded Warrant, which has been provided to the investors in this offering and which will be filed with the SEC as an exhibit to a Current Report on Form 8-K in connection with this offering and incorporated by reference into the registration statement of which this prospectus supplement forms a part. Prospective investors should carefully review the terms and provisions of the form of the Prefunded Warrant for a complete description of the terms and conditions of the Prefunded Warrant.

The Prefunded Warrants offered hereby will have an exercise price of $0.01 per share. The Prefunded Warrants will be immediately exercisable and may be exercised at any time after their original issuance until such Prefunded Warrants are exercised in full. The exercise price and number of shares of common stock issuable upon exercise are subject to appropriate adjustment in the event of share dividends, share splits, reorganizations or similar events affecting our shares of common stock. Prefunded Warrants will be issued in certificated form only.

The Prefunded Warrants will be exercisable, at the option of each holder, in whole or in part, by delivering to us a duly executed exercise notice accompanied by payment in full for the number of shares of common stock purchased upon such exercise (except in the case of a cashless exercise as discussed below). A holder (together with its affiliates) may not exercise any portion of such holder’s warrants to the extent that the holder would own more than 4.99% (or, at the election of the purchaser, 9.99%) of our outstanding shares of common stock immediately after exercise, except that upon at least 61 days’ prior notice from the holder to us, the holder may increase the amount of ownership of outstanding shares of common stock after exercising the holder’s Prefunded Warrants up to 9.99%

of the number of shares of common stock outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the Prefunded Warrants. Purchasers in this offering may also elect prior to the issuance of Prefunded Warrants to have the initial exercise limitation set at 9.99% of our outstanding shares of common stock.

The holder may elect to receive upon exercise (either in whole or in part) the net number of shares of common stock determined according to a formula set forth in the Prefunded Warrants.

In the event of any fundamental transaction, as described in the Prefunded Warrants and generally including any merger with or into another entity, sale of all or substantially all of our assets, tender offer or exchange offer, or reclassification of our shares of common stock, then upon any subsequent exercise of a Prefunded Warrant, the holder will have the right to receive as alternative consideration, for each share of common stock that would have been issuable upon such exercise immediately prior to the occurrence of such fundamental transaction, the number of shares of common stock of the successor or acquiring corporation or of our company, if it is the surviving corporation, and any additional consideration receivable upon or as a result of such transaction by a holder of the number of shares of common stock for which the Prefunded Warrant is exercisable immediately prior to such event.

In accordance with its terms and subject to applicable laws, a Prefunded Warrant may be transferred at the option of the holder upon surrender of the Prefunded Warrant to us together with the appropriate instruments of transfer and payment of funds sufficient to pay any transfer taxes (if applicable).

No fractional shares of common stock will be issued upon the exercise of the Prefunded Warrants. Rather, the number of shares of common stock to be issued will, at our election, either be rounded up to the nearest whole number or we will pay a cash adjustment in respect of such final fraction in an amount equal to such fraction multiplied by the exercise price.

There is no established trading market for the Prefunded Warrants, and we do not expect a market to develop. We do not intend to apply for a listing for the Prefunded Warrants on any securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of the Prefunded Warrants will be limited.

Except as otherwise provided in the Prefunded Warrants or by virtue of the holders’ ownership of shares of common stock, the holders of Prefunded Warrants do not have the rights or privileges of holders of our shares of common stock, including any voting rights, until such Prefunded Warrant holders exercise their warrants.

The Placement Agent Warrants will have substantially the same terms as the other warrants issued in this offering, except with an exercise price of $1.73, or 125% of the effective purchase price per share of common stock and Series C Warrant issued in this offering and a termination date that will be five years from the date of this prospectus supplement.

Our common stock is listed on the Nasdaq Capital Market under the symbol “FWBI”. There is no established public trading market for the warrants, and we do not expect a market to develop. We do not intend to apply for a listing for the warrants on any securities exchange or other nationally recognized trading system. Without an active trading market, the liquidity of the warrants will be limited.

Under the Series B Certificate of Designations, each holder of the Series B Preferred Stock may have the right to exchange the stated value, plus accrued and unpaid dividends, of the Series B Preferred Stock for shares of common stock on a dollar-for-dollar basis with investors in this offering, in lieu of any cash subscription payments therefor, referred to herein as the Series B Exchange Right. Any shares of our common stock issued pursuant to the Series B Exchange Right are anticipated to be made pursuant to exemptions provided by Section 3(a)(9) under the Securities Act of 1933, as amended (the “Securities Act”), or another applicable exemption therefrom, and accordingly will be freely transferable without restriction upon issuance pursuant to the exemption provided by Rule 144 under the Securities Act.

Between February 1 and February 7, 2022, we entered into Waivers with certain holders of Series B Preferred Stock, pursuant to which we agreed to pay a cash waiver fee equal to ten percent of the stated value of the shares of Series B Preferred Stock held by such holder, and such holder agreed to irrevocably waive its Series B Exchange Right with respect to any Subsequent Financing that occurs from and after the date of the Waiver until December 31, 2022. However, as of February 18, 2022, holders of Series B Preferred Stock holding approximately $2.21 million of stated value of the shares of Series B Preferred Stock outstanding did not enter into a Waiver with us. Accordingly, such non-waiving holders may exercise their Series B Exchange Right in connection with this offering.

Exchange Act. These rules and regulations may limit the timing of purchases and sales of common shares by Wainwright acting as principal. Under these rules and regulations, Wainwright:

The securities purchase agreement is included as an exhibit to a Current Report on Form 8-K that we have filed with the SEC and that is incorporated by reference into the registration statement of which this prospectus supplement forms a part.

Wainwright served as our sales agent for an at-the-market offering pursuant to the ATM Agreement dated May 26, 2021 for which Wainwright received compensation of approximately $575,000. Wainwright acted as placement agent for our March 2021 registered direct offering and received cash compensation of approximately $800,000 and warrants to purchase up to 55,009 shares of common stock at an exercise price of $15.906 per share.Wainwright also acted as the sole book-running manager for our July 2021 firm commitment offering and received an underwriting discount equal to 8.0% of the gross proceeds of the offering, reimbursements for certain expenses, and warrants to purchase up to 73,181 shares of common stock at an exercise price of $6.875 per share. In addition, Wainwright provided advisory and other transaction-related services in connection with the First Wave Acquisition and received various fees paid in cash for such services. In connection with the Warrant Amendment Agreement, Wainwright will receive a cash fee equal to 7.0% of the Cash Consideration.

From time to time, Wainwright may provide in the future various advisory, investment and commercial banking and other services to us in the ordinary course of business, for which they have received and may continue to receive customary fees and commissions. However, except as disclosed in this prospectus supplement, we have no present arrangements with Wainwright for any further services.

The following documents filed with the SEC are incorporated by reference into this prospectus supplement:

We also incorporate by reference all documents we file pursuant to Section 13(a), 13(c), 14 or 15 of the Exchange Act (other than any portions of filings that are furnished rather than filed pursuant to Items 2.02 and 7.01 of a Current Report on Form 8-K) after the date of this prospectus supplement and prior to the termination of the offering.

Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for the purposes of this registration statement to the extent that a statement contained herein or in any other subsequently filed document which also is or deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this registration statement.

Upon written or oral request, we will provide you without charge, a copy of any or all of the documents incorporated by reference, other than exhibits to those documents unless the exhibits are specifically incorporated by reference in the documents. Any such request should be addressed to us at: 777 Yamato Road, Suite 502, Boca Raton, Florida 33431, Attention: Chief Financial Officer, or made by phone at (561) 589-7020. You should rely only on information contained in, or incorporated by reference into, this prospectus supplement and the accompanying prospectus or any free writing prospectus we authorize for use in connection with this offering. We have not authorized anyone to provide you with information different from that contained in such documents or incorporated by reference in such documents. We are not making offers to sell the securities in any jurisdiction in which such an offer or solicitation is not authorized or to anyone to whom it is unlawful to make such offer or solicitation.

We may offer, issue and sell from time to time together or separately, in one or more offerings, any combination of (i) our common stock, (ii) our preferred stock, which we may issue in one or more series, (iii) warrants, (iv) subscription rights and (v) units. The preferred stock, warrants and subscription rights may be convertible into, or exercisable or exchangeable for, common or preferred stock or other securities of ours. The units may consist of any combination of the securities listed above.

The aggregate public offering price of the securities that we may offer will not exceed $150,000,000. We will offer the securities in an amount and on terms that market conditions will determine at the time of the offering. Our common stock is listed on the Nasdaq Capital Market under the symbol “AZRX.” The last reported sale price for our common stock on June 1, 2021 as quoted on the Nasdaq Capital Market was $0.86 per share. You are urged to obtain current market quotations of our common stock. We have no preferred stock, warrants, subscription rights or units listed on any market. Each prospectus supplement will indicate if the securities offered thereby will be listed on any securities exchange.

Should we offer any of the securities described in this prospectus, we will provide you with the specific terms of the particular securities being offered in supplements to this prospectus. You should read this prospectus and any supplement, together with additional information described under the headings “Where You Can Find More Information” and “Incorporation of Certain Information by Reference” carefully before you invest. This prospectus may not be used to sell securities unless accompanied by a prospectus supplement.

We may sell these securities directly to our stockholders or to other purchasers or through agents on our behalf or through underwriters or dealers as designated from time to time. If any agents or underwriters are involved in the sale of any of these securities, the applicable prospectus supplement will provide the names of the agents or underwriters and any applicable fees, commissions or discounts.

We are an “emerging growth company” as defined in Section 2(a) of the Securities Act of 1933, as amended the (“Securities Act”), and we have elected to comply with certain reduced public company reporting requirements.

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page 2 of this prospectus and the documents incorporated by reference into this prospectus for a discussion of the risks that you should consider in connection with an investment in our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission, or SEC, using a “shelf” registration process. Under this shelf registration process, we may from time to time offer and sell, in one or more offerings, any or all of the securities described in this prospectus, separately or together, up to an aggregate offering price of $150,000,000. This prospectus provides you with a general description of our securities being offered. When we issue the securities being offered by this prospectus, we will provide a prospectus supplement (which term includes, as applicable, the at-the-market sales agreement prospectus supplement filed with the registration statement of which this prospectus forms a part) that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information” and “Incorporation of Certain Information By Reference.”

This prospectus, including the documents that we incorporate by reference, contains forward-looking statements as that term is defined in the federal securities laws. The events described in forward-looking statements contained in this prospectus, including the documents that we incorporate by reference, may not occur. Generally, these statements relate to our business plans or strategies, projected or anticipated benefits or other consequences of our plans or strategies, financing plans, projected or anticipated benefits from acquisitions that we may make, or projections involving anticipated revenues, earnings or other aspects of our operating results or financial position, and the outcome of any contingencies. Any such forward-looking statements are based on current expectations, estimates and projections of management. We intend for these forward-looking statements to be covered by the safe-harbor provisions for forward-looking statements. Words such as “may,” “expect,” “believe,” “anticipate,” “project,” “plan,” “intend,” “estimate,” and “continue,” and their opposites and similar expressions are intended to identify forward-looking statements. We caution you that these statements are not guarantees of future performance or events and are subject to a number of uncertainties, risks and other influences, many of which are beyond our control that may influence the accuracy of the statements and the projections upon which the statements are based. Factors that may cause our results to materially differ from those expressed or implied by forward-looking statements include, but are not limited to, the risks and uncertainties discussed in the “Risk Factors” section on page 2 of this prospectus, in any prospectus supplement, in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020 or in other reports we file with the SEC.

Any one or more of these uncertainties, risks and other influences could materially affect our results of operations and whether forward-looking statements made by us ultimately prove to be accurate. Our actual results, performance and achievements could differ materially from those expressed or implied in these forward-looking statements. We undertake no obligation to publicly update or revise any forward-looking statements, whether from new information, future events or otherwise.

You should rely only on the information in this prospectus. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely upon it.

The descriptions of the securities contained in this prospectus, together with the applicable prospectus supplements, summarize all of the material terms and provisions of the various types of securities that we may offer. We will describe in the applicable prospectus supplement relating to any securities the particular terms of the securities offered by that prospectus supplement. If we indicate in the applicable prospectus supplement, the terms of the securities may differ from the terms we have summarized below. We may also include in the prospectus supplement information about material United States federal income tax considerations relating to the securities, and the securities exchange, if any, on which the securities will be listed.

We may sell from time to time, in one or more offerings:

In this prospectus, we refer to the common stock, preferred stock, subscription rights, warrants and units collectively as “securities.” The total dollar amount of all securities that we may sell pursuant to this prospectus will not exceed $150,000,000.

This prospectus may not be used to consummate a sale of securities unless it is accompanied by a prospectus supplement.

relative rights, preferences, and limitations of any series of preferred stock. The board of may increase or decrease the number of shares initially fixed for any series, but no decrease may reduce the number below the shares then outstanding and duly reserved for issuance. As of May 21, 2021, 5,194.81 shares were designated as Series B Preferred Stock, of which 893.52 were issued and outstanding, and 75,000 were designated as Series C Preferred Stock, of which none were issued and outstanding. This leaves 9,919,805.19 shares of preferred stock authorized but undesignated.

If we offer a specific series of preferred stock under this prospectus, we will describe the terms of the preferred stock in the prospectus supplement for such offering and will file a copy of the certificate establishing the terms of the preferred stock with the SEC. To the extent required, this description will include:

Under the Certificate of Designations for the Series B Preferred Stock (the “Series B Certificate of Designations”), each share of Series B Preferred Stock will be convertible, at the holder’s option at any time, into our common stock at a conversion rate equal to the quotient of (i) the $7,700 stated value (the “Series B Stated Value”) divided by (ii) the initial conversion price of $0.77, subject to specified adjustments for stock splits, cash or stock dividends, reorganizations, reclassifications other similar events as set forth in the Series B Certificate of Designations. In addition, if at any time after January 16, 2021, the six month anniversary of the date of the closing of our private placement transaction on July 16, 2020, the closing sale price per share of our common stock exceeds 250% of the initial conversion price, or $1.925, for 20 consecutive trading days, then all of the outstanding shares of Series B Preferred Stock will automatically convert (the “Automatic Conversion”) into such number of shares of our common stock as is obtained by multiplying the number of shares of Series B Preferred Stock to be so converted, plus the amount of any accrued and unpaid dividends thereon, by the Series B Stated Value per share and dividing the result by the then applicable conversion price.

The Series B Preferred Stock contains limitations that prevent the holder thereof from acquiring shares of our common stock upon conversion (including pursuant to the Automatic Conversion) that would result in the number of shares beneficially owned by such holder and its affiliates exceeding 9.99% of the total number of shares of our common stock outstanding immediately after giving effect to the conversion, which percentage may be increased or decreased at the holder’s election not to exceed 19.99%.

Each holder of shares of Series B Preferred Stock, in preference and priority to the holders of all other classes or series of our stock, is entitled to receive dividends, commencing from the date of issuance. Such dividends may be paid by us only when, as and if declared by our board of directors, out of assets legally available therefore, semiannually in arrears on the last day of June and December in each year, commencing December 31, 2020, at the dividend rate of 9.0% per year, which is cumulative and continues to accrue on a daily basis whether or not declared and whether or not we have assets legally available therefore. We may pay such dividends at our sole option either in cash or in kind in additional shares of Series B Preferred Stock (rounded down to the nearest whole share), provided we must pay in cash the fair value of any such fractional shares in excess of $100.00. Under the Series B Certificate of Designations, to the extent that applicable law or any of our existing contractual restrictions prohibit any required issuance of additional shares of Series B Preferred Stock as in-kind dividends or otherwise (“Additional Shares”), then appropriate adjustment to the conversion price of the Series B Preferred Stock shall be made so that the resulting number of conversion shares includes the aggregate number of shares of our common stock into which such Additional Shares would otherwise be convertible.

Under the Series B Certificate of Designations, each share of Series B Preferred Stock carries a liquidation preference equal to the Series B Stated Value (as adjusted thereunder) plus accrued and unpaid dividends thereon (the “Series B Liquidation Preference”).

In the event we effect any issuance of common stock or common stock equivalents for cash consideration, or a combination of units thereof (a “Subsequent Financing”), each holder of the Series B Preferred Stock has the right, subject to certain exceptions set forth in the Series B Certificate of Designations, at its option, to exchange (in lieu of cash subscription payments) all or some of the Series B Preferred Stock then held (with a value per share of Series B Preferred Stock equal to the Series B Liquidation Preference) for any securities or units issued in a Subsequent Financing on dollar-for-dollar basis. As a result, we may currently be required to issue additional shares of Series C Preferred Stock to any holders of Series B Preferred Stock who elect to exercise this right. Any shares of Series C Preferred Stock to be issued pursuant to this right would, upon issuance, be immediately converted into underlying shares of our common stock.

The holders of the Series B Preferred Stock, voting as a separate class, will have customary consent rights with respect to certain corporate actions by us. We may not take the following actions without the prior consent of the holders of at least a majority of the Series B Preferred Stock then outstanding: (a) authorize, create, designate, establish, issue or sell an increased number of shares of Series B Preferred Stock or any other class or series of capital stock ranking senior to or on parity with the Series B Preferred Stock as to dividends or upon liquidation; (b) reclassify any shares of common stock or any other class or series of capital stock into shares having any preference or priority as to dividends or upon liquidation superior to or on parity with any such preference or priority of Series B Preferred Stock; (c) amend, alter or repeal our Charter or Bylaws and the powers, preferences, privileges, relative, participating, optional and other special rights and qualifications, limitations and restrictions thereof, which would adversely affect any right, preference, privilege or voting power of the Series B Preferred Stock; (d) issue any indebtedness or debt security, other than trade accounts payable, insurance premium financings and/or letters of credit, performance bonds or other similar credit support incurred in the ordinary course of business, or amend, renew, increase, or otherwise alter in any material respect the terms of any such indebtedness existing as of the date of first issuance of shares of Series B Preferred Stock; (e) redeem, purchase, or otherwise acquire or pay or declare any dividend or other distribution on (or pay into or set aside for a sinking fund for any such purpose) any of our capital stock; (f) declare bankruptcy, dissolve, liquidate, or wind up our affairs; (g) effect, or enter into any agreement to effect, a Change of Control (as defined in the Series B Certificate of Designations); or (h) materially modify or change the nature of our business.

Under the Certificate of Designations for the Series C Preferred Stock (the “Series C Certificate of Designations”), each share of Series C Preferred Stock will be convertible, at either the holder’s option or at our option at any time, into common stock at a conversion rate equal to the quotient of (i) the Series C Stated Value of $750 plus all accrued and accumulated and unpaid dividends on such share of Series C Preferred Stock divided by (ii) the initial conversion price of $0.75, subject to specified adjustments for stock splits, cash or stock dividends, reorganizations, reclassifications other similar events as set forth in the Series C Certificate of Designations.

The Series C Preferred Stock contains limitations that prevent the holders thereof from acquiring shares of our common stock upon conversion that would result in the number of shares beneficially owned by any such holder and

its affiliates exceeding 9.99% of the total number of shares of our common stock outstanding immediately after giving effect to the conversion. As a result, the Series C Certificate of Designations provides for the issuance of pre-funded warrants to purchase shares of our common stock, with an exercise price of $0.001 per share and with no expiration date, if necessary to comply with this limitation.

Each holder of shares of Series C Preferred Stock, subject to the preference and priority to the holders of our Series B Preferred Stock, is entitled to receive dividends, commencing from the date of issuance of the Series C Preferred Stock. Such dividends may be paid only when, as and if declared by our board of directors, out of assets legally available therefore, quarterly in arrears on the last day of March, June, September and December in each year, commencing on the date of issuance, at the dividend rate of 9.0% per year. Such dividends are cumulative and continue to accrue on a daily basis whether or not declared and whether or not we have assets legally available therefore.

Under the Series C Certificate of Designations, each share of Series C Preferred Stock carries a liquidation preference equal to the Series C Stated Value plus accrued and unpaid dividends thereon and any other fees or liquidated damages then due and owing thereon.

The holders of the Series C Preferred Stock have no voting rights. We may not take the following actions without the prior consent of the holders of at least a majority of the Series C Preferred Stock then outstanding: (a) alter or change adversely the powers, preferences or rights given to the Series C Preferred Stock or alter or amend the Series C Certificate of Designations, (b) authorize or create any class of stock ranking as to dividends, redemption or distribution of assets upon a Liquidation (as defined in the Series C Certificate of Designations) senior to, or otherwise pari passu with, the Series C Preferred Stock, (c) amend our Charter or other charter documents in any manner that adversely affects any rights of the holders of the Series C Preferred Stock, (d) increase the number of authorized shares of Series C Preferred Stock, or (e) enter into any agreement with respect to any of the foregoing.

The transfer agent and registrar for any series or class of preferred stock will be set forth in each applicable prospectus supplement.

Certain provisions of Delaware law, our Charter and Bylaws discussed below may have the effect of making more difficult or discouraging a tender offer, proxy contest or other takeover attempt. These provisions are expected to encourage persons seeking to acquire control of our company to first negotiate with our Board of Directors. We believe that the benefits of increasing our ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire or restructure our company outweigh the disadvantages of discouraging these proposals because negotiation of these proposals could result in an improvement of their terms.

We are subject to Section 203 of the Delaware General Corporation Law (the “DGCL”). Section 203 generally prohibits a public Delaware corporation from engaging in a “business combination” with an “interested stockholder” for a period of three years after the date of the transaction in which the person became an interested stockholder, unless:

Section 203 defines a “business combination” to include:

In general, Section 203 defines an “interested stockholder” as any person that is:

Under specific circumstances, Section 203 makes it more difficult for an “interested stockholder” to effect various business combinations with a corporation for a three-year period, although the stockholders may, by adopting an amendment to the corporation’s certificate of incorporation or bylaws, elect not to be governed by this section, effective 12 months after adoption.

Our Charter and Bylaws do not exclude us from the restrictions of Section 203. We anticipate that the provisions of Section 203 might encourage companies interested in acquiring us to negotiate in advance with our Board of Directors since the stockholder approval requirement would be avoided if a majority of the directors then in office approve either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder.

Provisions of our Charter and Bylaws may delay or discourage transactions involving an actual or potential change of control or change in our management, including transactions in which stockholders might otherwise receive a premium for their shares, or transactions that our stockholders might otherwise deem to be in their best interests. Therefore, these provisions could adversely affect the price of our common stock.

Our Bylaws provide that our stockholders may take action by written consent or electronic transmission, setting forth the action so taken, signed or e-mailed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting for such purpose.

We have shares of common stock and preferred stock available for future issuance without stockholder approval. We may utilize these additional shares for a variety of corporate purposes, including future public offerings to raise additional capital, to facilitate corporate acquisitions or payment as a dividend on the capital stock.

The existence of unissued and unreserved common stock and preferred stock may enable our board of directors to issue shares to persons friendly to current management or to issue preferred stock with terms that could render more difficult or discourage a third-party attempt to obtain control of us by means of a merger, tender offer, proxy contest or otherwise, thereby protecting the continuity of our management. In addition, the board of directors has the discretion to determine designations, rights, preferences, privileges and restrictions, including voting rights, dividend rights, conversion rights, redemption privileges and liquidation preferences of each series of preferred stock, all to the fullest extent permissible under the DGCL and subject to any limitations set forth in our Charter. The purpose of

authorizing the board of directors to issue preferred stock and to determine the rights and preferences applicable to such preferred stock is to eliminate delays associated with a stockholder vote on specific issuances. The issuance of preferred stock, while providing desirable flexibility in connection with possible financings, acquisitions and other corporate purposes, could have the effect of making it more difficult for a third party to acquire, or could discourage a third party from acquiring, a majority of our outstanding voting stock.

We may issue subscription rights to purchase our common stock. These subscription rights may be offered independently or together with any other security offered hereby and may or may not be transferable by the stockholder receiving the subscription rights in such offering. In connection with any offering of subscription rights, we may enter into a standby arrangement with one or more underwriters or other purchasers pursuant to which the underwriters or other purchasers may be required to purchase any securities remaining unsubscribed for after such offering.

The prospectus supplement relating to any subscription rights we offer, if any, will, to the extent applicable, include specific terms relating to the offering, including some or all of the following:

To the extent applicable, each warrant, subscription right and unit, will be represented either by a certificate issued in definitive form to a particular investor or by one or more global securities representing the entire issuance of securities. Certificated securities in definitive form and global securities will be issued in registered form. Definitive securities name you or your nominee as the owner of the security, and in order to transfer or exchange these securities or to receive payments other than interest or other interim payments, you or your nominee must physically deliver the securities to the trustee, registrar, paying agent or other agent, as applicable. Global securities name a depositary or its nominee as the owner of warrants represented by these global securities. The depositary maintains a computerized system that will reflect each investor’s beneficial ownership of the securities through an account maintained by the investor with its broker/dealer, bank, trust company or other representative, as we explain more fully below.

Registered Global Securities. We may issue, to the extent applicable, warrants, subscription rights and units, in the form of one or more fully registered global securities that will be deposited with a depositary or its nominee identified in the applicable prospectus supplement and registered in the name of that depositary or nominee. In those cases, one or more registered global securities will be issued in a denomination or aggregate denominations equal to the portion of the aggregate principal or face amount of the securities to be represented by registered global securities. Unless and until it is exchanged in whole for securities in definitive registered form, a registered global security may not be transferred except as a whole by and among the depositary for the registered global security, the nominees of the depositary or any successors of the depositary or those nominees.

If not described below, any specific terms of the depositary arrangement with respect to any securities to be represented by a registered global security will be described in the prospectus supplement relating to those securities. We anticipate that the following provisions will apply to all depositary arrangements.

Ownership of beneficial interests in a registered global security will be limited to persons, called participants, that have accounts with the depositary or persons that may hold interests through participants. Upon the issuance of a registered global security, the depositary will credit, on its book-entry registration and transfer system, the participants’ accounts with the respective principal or face amounts of the securities beneficially owned by the participants. Any dealers, underwriters or agents participating in the distribution of the securities will designate the accounts to be credited. Ownership of beneficial interests in a registered global security will be shown on, and the transfer of ownership interests will be effected only through, records maintained by the depositary, with respect to interests of participants, and on the records of participants, with respect to interests of persons holding through participants. The laws of some states may require that some purchasers of securities take physical delivery of these securities in definitive form. These laws may impair your ability to own, transfer or pledge beneficial interests in registered global securities.

So long as the depositary, or its nominee, is the registered owner of a registered global security, that depositary or its nominee, as the case may be, will be considered the sole owner or holder of the securities represented by the registered global security for all purposes under the applicable indenture or warrant agreement. Except as described below, owners of beneficial interests in a registered global security will not be entitled to have the securities represented by the registered global security registered in their names, will not receive or be entitled to receive physical delivery of the securities in definitive form and will not be considered the owners or holders of the securities under the applicable indenture or warrant agreement. Accordingly, each person owning a beneficial interest in a registered global security must rely on the procedures of the depositary for that registered global security and, if that person is not a participant, on the procedures of the participant through which the person owns its interest, to exercise any rights of a holder under the applicable indenture or warrant agreement. We understand that under existing industry practices, if we request any action of holders or if an owner of a beneficial interest in a registered global security desires to give or take any action that a holder is entitled to give or take under the applicable indenture or warrant agreement, the depositary for the registered global security would authorize the participants holding the relevant beneficial interests to give or take that action, and the participants would authorize beneficial owners owning through them to give or take that action or would otherwise act upon the instructions of beneficial owners holding through them.

Any payments to holders with respect to warrants represented by a registered global security registered in the name of a depositary or its nominee will be made to the depositary or its nominee, as the case may be, as the

registered owner of the registered global security. None of the Company, the trustees, the warrant agents or any other agent of the Company, the trustees or the warrant agents will have any responsibility or liability for any aspect of the records relating to payments made on account of beneficial ownership interests in the registered global security or for maintaining, supervising or reviewing any records relating to those beneficial ownership interests.

We expect that the depositary for any of the securities represented by a registered global security, upon receipt of any payment of principal, premium, interest or other distribution of underlying securities or other property to holders on that registered global security, will immediately credit participants’ accounts in amounts proportionate to their respective beneficial interests in that registered global security as shown on the records of the depositary. We also expect that payments by participants to owners of beneficial interests in a registered global security held through participants will be governed by standing customer instructions and customary practices, as is now the case with the securities held for the accounts of customers in bearer form or registered in “street name,” and will be the responsibility of those participants.

If the depositary for any of these securities represented by a registered global security is at any time unwilling or unable to continue as depositary or ceases to be a clearing agency registered under the Securities Exchange Act of 1934, as amended, or the Exchange Act, and a successor depositary registered as a clearing agency under the Exchange Act is not appointed by us within 90 days, we will issue securities in definitive form in exchange for the registered global security that had been held by the depositary. Any securities issued in definitive form in exchange for a registered global security will be registered in the name or names that the depositary gives to the relevant trustee or warrant agent or other relevant agent of ours or theirs. It is expected that the depositary’s instructions will be based upon directions received by the depositary from participants with respect to ownership of beneficial interests in the registered global security that had been held by the depositary.

Unless otherwise set forth in a prospectus supplement accompanying this prospectus, we may sell the securities being offered hereby, from time to time, by one or more of the following methods:

Offerings of securities covered by this prospectus also may be made into an existing trading market for those securities in transactions at other than a fixed price, either:

Those at-the-market offerings, if any, will be conducted by underwriters acting as principal or agent of the Company, who may also be third-party sellers of securities as described above. The prospectus supplement with respect to the offered securities will set forth the terms of the offering of the offered securities, including:

The distribution of the securities may be effected from time to time in one or more transactions:

Each prospectus supplement will set forth the manner and terms of an offering of securities including:

In addition, we may enter into derivative or hedging transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. The applicable prospectus supplement may indicate, in connection with such a transaction, that the third parties may sell securities covered by and pursuant to this prospectus and an applicable prospectus supplement. If so, the third party may use securities pledged by us or borrowed from us or others to settle such sales and may use securities received from us to close out any related short positions. We may also loan or pledge securities covered by this prospectus and an applicable prospectus supplement to third parties, who may sell the loaned securities or, in an event of default in the case of a pledge, sell the pledged securities pursuant to this prospectus and the applicable prospectus supplement.

In order to facilitate the offering of certain securities under this prospectus or an applicable prospectus supplement, certain persons participating in the offering of those securities may engage in transactions that stabilize, maintain or otherwise affect the price of those securities during and after the offering of those securities. Specifically, if the applicable prospectus supplement permits, the underwriters of those securities may over-allot or otherwise create a short position in those securities for their own account by selling more of those securities than have been sold to them by us and may elect to cover any such short position by purchasing those securities in the open market.

In addition, the underwriters may stabilize or maintain the price of those securities by bidding for or purchasing those securities in the open market and may impose penalty bids, under which selling concessions allowed to syndicate members or other broker-dealers participating in the offering are reclaimed if securities previously distributed in the offering are repurchased in connection with stabilization transactions or otherwise. The effect of these transactions may be to stabilize or maintain the market price of the securities at a level above that which might otherwise prevail in the open market. The imposition of a penalty bid may also affect the price of securities to the extent that it discourages resales of the securities. No representation is made as to the magnitude or effect of any such stabilization or other transactions. Such transactions, if commenced, may be discontinued at any time.

In order to comply with the securities laws of certain states, if applicable, the securities must be sold in such jurisdictions only through registered or licensed brokers or dealers. In addition, in certain states the securities may not be sold unless they have been registered or qualified for sale in the applicable state or an exemption from the registration or qualification requirement is available and is complied with.

Rule 15c6-1 under the Exchange Act generally requires that trades in the secondary market settle in two business days, unless the parties to any such trade expressly agree otherwise. Your prospectus supplement may provide that the original issue date for your securities may be more than two scheduled business days after the trade date for your securities. Accordingly, in such a case, if you wish to trade securities on any date prior to the second business day before the original issue date for your securities, you will be required, by virtue of the fact that your securities initially are expected to settle in more than two scheduled business days after the trade date for your securities, to make alternative settlement arrangements to prevent a failed settlement.

This prospectus, any applicable prospectus supplement and any applicable pricing supplement in electronic format may be made available on the Internet sites of, or through other online services maintained by, us and/or one or more of the agents and/or dealers participating in an offering of securities, or by their affiliates. In those cases, prospective investors may be able to view offering terms online and, depending upon the particular agent or dealer, prospective investors may be allowed to place orders online.

Other than this prospectus, any applicable prospectus supplement and any applicable pricing supplement in electronic format, the information on our website or the website of any agent or dealer, and any information contained in any other website maintained by any agent or dealer:

There can be no assurance that we will sell all or any of the securities offered by this prospectus.

This prospectus may also be used in connection with any issuance of common stock or preferred stock upon exercise of a warrant if such issuance is not exempt from the registration requirements of the Securities Act.

In addition, we may issue the securities as a dividend or distribution or in a subscription rights offering to our existing securityholders. In some cases, we or dealers acting with us or on our behalf may also purchase securities and reoffer them to the public by one or more of the methods described above. This prospectus may be used in connection with any offering of our securities through any of these methods or other methods described in the applicable prospectus supplement.

Unless otherwise indicated in the applicable prospectus supplement, the validity of the securities offered hereby will be passed upon for us by Lowenstein Sandler LLP, New York, New York. If the validity of the securities offered hereby in connection with offerings made pursuant to this prospectus are passed upon by counsel for the underwriters, dealers or agents, if any, such counsel will be named in the prospectus supplement relating to such offering.

The audited annual consolidated financial statements of AzurRx BioPharma, Inc. incorporated by reference in this prospectus and elsewhere in the registration statement have been incorporated by reference in reliance upon the report of Mazars USA LLP, independent registered public accounting firm, upon the authority of said firm as experts in accounting and auditing. The 2020 and 2019 audited annual consolidated financial statements of AzurRx BioPharma, Inc., as of and for the years ended December 31, 2020 and 2019, have been audited by Mazars USA LLP, independent registered public accounting firm. The audit report dated March 31, 2021 for the 2020 audited annual consolidated financial statements includes an explanatory paragraph which states that certain circumstances raise substantial doubt about our ability to continue as a going concern.

Section 145 of the DGCL provides that we may indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal or investigative (other than an action by us or in our right) by reason of the fact that he is or was our director, officer, employee or agent, or is or was serving at our request as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by him or her in connection with such action, suit or proceeding if he acted in good faith and in a manner he or she reasonably believed to be in or not opposed to our best interests, and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful. Section 145 further provides that we similarly may indemnify any such person serving in any such capacity who was or is a party or is threatened to be made a party to any threatened, pending or completed action or suit by is or in our right to procure judgment in our favor, against expenses actually and reasonably incurred in connection with the defense or settlement of such action or suit if he or she acted in good faith and in a manner he reasonably believed to be in or not opposed to our best interests and except that no indemnification shall be made in respect of any claim, issue or matter as to which such person shall have been adjudged to be liable to us unless and only to the extent that the Delaware Court of Chancery or such other court in which such action or suit was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses which the Court of Chancery or such other court shall deem proper.

Our Charter limits the liability of our directors to the fullest extent permitted by Delaware law. In addition, we have entered into indemnification agreements with certain of our directors and officers whereby we have agreed to indemnify those directors and officers to the fullest extent permitted by law, including indemnification against expenses and liabilities incurred in legal proceedings to which the director or officer was, or is threatened to be made, a party by reason of the fact that such director or officer is or was a director, officer, employee or agent of the Company, provided that such director or officer acted in good faith and in a manner that the director or officer reasonably believed to be in, or not opposed to, the best interests of the Company.

We have director and officer liability insurance to cover liabilities our directors and officers may incur in connection with their services to us, including matters arising under the Securities Act. Our Charter and Bylaws also provide that we will indemnify our directors and officers who, by reason of the fact that he or she is one of our officers or directors of our company, is involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative, related to their board role with the company.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to our directors, officers and controlling persons pursuant to the foregoing provisions, or otherwise, we have been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful

defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, we will, unless in the opinion of our counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by us is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

We are subject to the informational requirements of the Securities Exchange Act of 1934, as amended, and in accordance therewith file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information regarding registrants that file electronically with the SEC. The address of the SEC’s website is www.sec.gov.

We make available free of charge on or through our website at www.pioneerpowersolutions.com, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file such material with or otherwise furnish it to the SEC.

We have filed with the SEC a registration statement under the Securities Act, relating to the offering of these securities. The registration statement, including the attached exhibits, contains additional relevant information about us and the securities. This prospectus does not contain all of the information set forth in the registration statement. You can obtain a copy of the registration statement for free at www.sec.gov. The registration statement and the documents referred to below under “Incorporation of Certain Information By Reference” are also available on our website, www.azurrx.com.

We have not incorporated by reference into this prospectus the information on our website, and you should not consider it to be a part of this prospectus.

The following documents filed with the SEC are incorporated by reference into this prospectus:

We also incorporate by reference all documents we file pursuant to Section 13(a), 13(c), 14 or 15 of the Exchange Act (other than any portions of filings that are furnished rather than filed pursuant to Items 2.02 and 7.01 of a Current Report on Form 8-K) after the date of the initial registration statement of which this prospectus is a part and prior to effectiveness of such registration statement. All documents we file in the future pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this prospectus and prior to the termination of the offering are also incorporated by reference and are an important part of this prospectus.

Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for the purposes of this registration statement to the extent that a statement contained herein or in any other subsequently filed document which also is or deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this registration statement.