Little more than a year since FDA approval of its COVID-19 vaccine, Pfizer Inc. has published final phase II/III data on its oral antiviral candidate, Paxlovid (nirmatrelvir + ritonavir), confirming that, for non-hospitalized, high-risk adults with COVID-19, taking the drug within three days of symptom onset reduced all-cause risk of hospitalization or death by 89% vs. placebo.
Although Pfizer Inc.’s COVID-19 oral antiviral candidate, Paxlovid (PF-07321332; ritonavir), has yet to be authorized anywhere, the push for compulsory licensing of the drug has begun.
One of the biggest concerns at the Nov. 30 meeting of the FDA’s Antimicrobial Drugs Advisory Committee is that, if Merck & Co. Inc.-Ridgeback Biotherapeutics Inc.’s antiviral drug, molnupiravir, is authorized for use in treating mild to moderate COVID-19 in patients at high risk of progressing to severe disease, it might be used too broadly, given its potential risks.
A divided FDA advisory committee voted 13-10 Nov. 30 that the known and potential benefits of the Merck & Co. Inc.-Ridgeback Biotherapeutics Inc.’s antiviral drug, molnupiravir, outweighs its known and potential risks. If granted an emergency use authorization (EUA), molnupiravir would become the first take-at-home oral drug in the U.S. to keep mild and moderate COVID-19 infections from becoming severe in high-risk adults.
Molnupiravir, the take-at-home pill from Merck & Co. Inc. hailed as a potential game-changer against COVID-19, is not as effective as previously thought, according to newly released trial data from the company.
It’s decision time for oral drugs that could help the world return to normal even in the midst of the COVID-19 pandemic. The U.K. already has granted emergency authorization to Merck & Co. Inc. and Ridgeback Biotherapeutics Inc.’s antiviral, Lagevrio (molnupiravir), and the EMA is expected to complete its evaluation of the oral drug within the next few weeks. In the U.S., the FDA could announce its decision on Lagevrio shortly after its Antimicrobial Drugs Advisory Committee weighs in Nov. 30 on emergency use authorization.
Just a day after the world's first approval of Merck & Co. Inc.'s oral antiviral for COVID-19 positioned it to offer a new way to keep Britons at high risk of severe disease out of the hospital, Pfizer Inc. is stopping a phase II/III trial of its oral antiviral, Paxlovid, early for "overwhelming efficacy" in a similar group. Interim results showed that combining the drug, also known as PF-07321332, with ritonavir reduced the risk of hospitalization or death for adults with mild to moderate COVID-19 but at high risk of severe disease by 89% vs. placebo.
