Merck & Co Inc’s experimental oral drug for COVID-19, molnupiravir, reduced by around 50% the chance of hospitalization or death for patients at risk of severe disease, according to interim clinical trial results announced on Friday.
Merck and partner Ridgeback Biotherapeutics plan to seek U.S. emergency use authorization for the pill as soon as possible, and to submit applications to regulatory agencies worldwide. Due to the positive results, the Phase 3 trial is being stopped early at the recommendation of outside monitors.
“This is going to change the dialogue around how to manage COVID-19,” Robert Davis, Merck’s chief executive officer, told Reuters.
If authorized, molnupiravir, which is designed to introduce errors into the genetic code of the virus, would be the first oral antiviral medication for COVID-19.
The news sent Merck’s shares up almost 8% in pre-market New York trading.
Rivals including Pfizer Inc and Swiss pharmaceutical Roche Holding AG are racing to develop an easy-to-administer antiviral pill for COVID-19 but so far, only antibody cocktails – which have to be given intravenously – are approved for treating non-hospitalized COVID-19 patients.
A planned interim analysis of 775 patients in Merck’s study found that 7.3% of those given molnupiravir were either hospitalized or had died by 29 days after treatment, compared with 14.1% of placebo patients. There were no deaths in the molnupiravir group, but there were eight deaths of placebo patients.
“Antiviral treatments that can be taken at home to keep people with COVID-19 out of the hospital are critically needed, Wendy Holman, Ridgeback’s CEO, said in a statement.
Scientists welcomed the potential new treatment to help prevent serious illness from the virus, which has killed almost 5 million people around the world.
“The availability of a well-tolerated, effective oral antiviral will be particularly useful in supplementing vaccination as a means to reduce the proportion of patients needing hospital care,” Professor Penny Ward, visiting professor in pharmaceutical medicine at Kings College London.
In the trial, which enrolled patients around the world, molnupiravir was taken every 12 hours for five days.
The study enrolled patients with laboratory-confirmed mild-to-moderate COVID-19, who had symptoms for no more than five days. All patients had at least one risk factor associated with poor disease outcome, such as obesity or older age.