Acasti Pharma Announces the Closing of Over-Allotment Option for its Public Offering of Common Shares

LAVAL, QUÉBEC--(Marketwired - Jan. 22, 2018) - Acasti Pharma Inc. (NASDAQ:ACST)(TSX VENTURE:ACST), a biopharmaceutical innovator focused on the research, development and commercialization of its prescription drug candidate CaPre® (omega-3 phospholipid) for the treatment of severe hypertriglyceridemia, today announced that the underwriters of its offering of 9,900,990 common shares, together with warrants to purchase up to 8,910,891 common shares (the "Offering") have given notice to exercise their over-allotment option by purchasing an additional 766,179 common shares at a price of US$1.01 per share, for additional gross proceeds to Acasti of approximately US$773,000. Closing of the exercise of the over-allotment option occurred on Monday, January 22, 2018.

The Benchmark Company, LLC is acting as book-running manager of this Offering and as representative of the underwriters, The Benchmark Company, LLC and Dawson James Securities, Inc.

A registration statement relating to the offering was filed with the Securities and Exchange Commission (SEC) on December 19, 2017 and has become effective. The final prospectus relating to this offering, as supplemented, may be obtained by contacting Dawson James Securities, Inc., Attention: Prospectus Department, 1 North Federal Highway, 5th Floor, Boca Raton, FL 33432, [e-mail] or toll free at 866.928.0928, or by accessing the SEC's website at www.sec.gov.

This press release is for information purposes only and shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About Acasti Pharma

Acasti Pharma is a biopharmaceutical innovator advancing a potentially best-in-class cardiovascular drug, CaPre (omega-3 phospholipid), for the treatment of hypertriglyceridemia, a chronic condition affecting an estimated one third of the U.S. population. The company's strategy is to initially develop and commercialize CaPre for the 3 to 4 million patients in the U.S. with severe hypertriglyceridemia. Since its founding in 2008, Acasti Pharma has focused on addressing a critical market need for an effective, safe and well-absorbing omega-3 therapeutic that can make a positive impact on the major blood lipids associated with cardiovascular disease risk. For more information, visit www.acastipharma.com.