News Briefs: Amylyx Is Withdrawing ALS Drug Relyvrio in U.S., Canada
Amylyx Pharmaceuticals, Inc. said on April 4 that it was voluntarily discontinuing the marketing authorization for Relyvrio (sodium phenylbutyrate and taurursodiol) in the U.S. and in Canada, where it is known as Albrioza. As part of a restructuring, the company also is laying off about 70% of its workforce. The FDA approved the agent for the treatment of amyotrophic lateral sclerosis (ALS) on Sept. 29, 2022, based on data from a Phase II trial involving 137 people. But on March 8, the company revealed that its Phase III PHOENIX trial did not meet the prespecified primary or secondary endpoints. Prior to the drug’s approval, the FDA’s Peripheral and Central Nervous System Drugs Advisory committee found that the study did not provide substantial evidence that the therapy was effective, but during a second meeting in September reversed course in favor of approval. At the time of Relyvrio’s approval, Amylyx co-founder and co-CEO Justin Klee declared that “if the PHOENIX trial is not successful, we will do what’s right for patients, which includes taking the drug voluntarily off the market.” The company will not allow any new prescriptions for the drug, but it will transition current patients who wish to remain on treatment with Relyvrio to a free drug program. Amylyx will present topline data from the PHOENIX trial at the American Academy of Neurology Annual Meeting in Denver on April 16.