AP

US adds second COVID-19 pill, this time from Merck

Dec 23, 2021, 7:59 AM | Updated: 10:58 am
FILE - This undated photo provided by Merck & Co. shows their new antiviral medication molnupir...
FILE - This undated photo provided by Merck & Co. shows their new antiviral medication molnupiravir. U.S. regulators have authorized a second pill against COVID-19, an antiviral drug from Merck that may help blunt the wave of infections driven by the omicron variant. The Food and Drug Administration granted the drug emergency use Thursday, Dec. 23, 2021, for adults with early COVID-19 who face the highest risks of hospitalization.(Merck & Co. via AP, File)
(Merck & Co. via AP, File)

WASHINGTON (AP) — U.S. health regulators on Thursday authorized the second pill against COVID-19, providing another easy-to-use medication to battle the rising tide of omicron infections.

The Food and Drug Administration authorization of Merck’s molnupiravir comes one day after the agency cleared a competing drug from Pfizer. That pill, Paxlovid, is likely to become the first-choice treatment against the virus, thanks to its superior benefits and milder side effects.

As a result, Merck’s pill is expected to have a smaller role against the pandemic than predicted just a few weeks ago. Its ability to head off severe COVID-19 is much smaller than initially announced and the drug label will warn of serious safety issues, including the potential for birth defects.

The Food and Drug Administration authorized Merck’s drug for adults with early symptoms of COVID-19 who face the highest risks of hospitalization, including older people and those with conditions like obesity and heart disease. The U.K. first authorized the pill in early November.

Known as molnupiravir, the Merck drug will carry a warning against use during pregnancy. Women of childbearing age should use birth control during treatment and for a few days after while men should use birth control for at least three months after their final dose, the FDA said.

The restrictions were expected after an FDA advisory panel only narrowly endorsed the drug last month, warning that its use would have to be strictly tailored to patients who can benefit the most.

The Pfizer pill works differently and doesn’t carry the same risks. Additionally, Pfizer’s drug was roughly three times more effective in testing, reducing hospitalization and death by nearly 90% among high-risk patients, compared with 30% for Merck’s.

Some experts question whether there will be much of a role for the Merck drug in the U.S.

“To the extent that there’s an ample supply of Pfizer’s pill, I think it won’t be used,” said Dr. Gregory Poland of the Mayo Clinic, referring to the Merck drug. “There would be no reason, given it has less efficacy and a higher risk of side effects.”

For now, the FDA decision provides another potential option against the virus that has killed more than 800,000 Americans, even as health officials brace for record-setting cases, hospitalizations, and deaths driven by the omicron variant. Antiviral pills, including Merck’s, are expected to be effective against omicron because they don’t target the spike protein where most of the variant’s worrisome mutations reside.

The FDA based its decision on results showing nearly 7% of patients taking the drug ended up in the hospital and one died at the end of 30 days. That compared with 10% of patients hospitalized who were taking the placebo and nine deaths.

Federal officials have agreed to purchase enough of the drug to treat 3.1 million people.

The U.S. will pay about $700 for each course of Merck’s drug, which requires patients to take four pills twice a day for five days. A review by Harvard University and King’s College London estimated it costs about $18 to make each 40-pill course of treatment.

Merck’s drug inserts tiny errors into the coronavirus’ genetic code to slow its reproduction. That genetic effect has raised concerns that the drug could cause mutations in human fetuses and even spur more virulent strains of the virus. But FDA scientists said the variant risk is largely theoretical because people take the drug for such a short period of time.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

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US adds second COVID-19 pill, this time from Merck