Merck says experimental pill halves Covid-19 deaths

Source: Associated Press

In a potential leap forward in the global fight against the pandemic, drugmaker Merck said Saturday that its experimental pill for people sick with Covid-19 reduced hospitalisations and deaths by half.

That could add a whole new easy-to-use weapon to an arsenal that already includes the Covid-19 vaccine.

The company said it will soon ask health officials in the US and around the world to authorise the pill’s use. A decision from the US Food and Drug Administration could come within weeks after that, and the drug, if it gets the OK, could be distributed quickly soon afterward.

If cleared, it would be the first pill shown to treat Covid-19. All other therapies now authorised in the US require an IV or injection. A pill taken at home, by contrast, would ease pressure on hospitals and could also help curb outbreaks in poorer and more remote corners of the world that don’t have access to the more expensive infusion therapies.

“This would allow us to treat many more people much more quickly and, we trust, much less expensively,” said Dr William Schaffner, an infectious disease expert at Vanderbilt University who was not involved in the research.

Merck and its partner Ridgeback Biotherapeutics said early results showed patients who received the drug, molnupiravir, within five days of Covid-19 symptoms had about half the rate of hospitalisation and death as those who received a dummy pill.

The study tracked 775 adults with mild-to-moderate Covid-19 who were considered to be at higher risk for severe disease because of health problems such as obesity, diabetes or heart disease. The results have not been reviewed by outside experts, the usual procedure for vetting new medical research.

Among patients taking molnupiravir, 7.3 per cent were either hospitalised or died at the end of 30 days, compared with 14.1 per cent of those getting the dummy pill. After that time period, there were no deaths among those who received the drug, compared with eight in the placebo group, according to Merck.

The results were so strong that an independent group of medical experts monitoring the trial recommended stopping it early.

Company executives said they plan to submit the data to the FDA in the coming days.

Even with the news of a potentially effective new treatment for Covid-19, experts stressed the importance of vaccines for controlling the pandemic, given that they help prevent transmission and also reduce the severity of illness in those who do get infected.

White House coronavirus coordinator Jeff Zients said that vaccination will remain the government’s main strategy for controlling the pandemic. “We want to prevent infections, not just wait to treat them when they happen,” he said.

Dr Anthony Fauci, the government's foremost authority on infectious diseases, called the results from Merck “very good news”.

Merck studied its drug only in people who were not vaccinated. But FDA regulators may consider authorising it for broader use in vaccinated patients who get breakthrough Covid-19 symptoms.

Andrew Pekosz of Johns Hopkins University predicted vaccines and antiviral drugs would ultimately be used together to protect against the worst effects of Covid-19.

“These shouldn’t be seen as replacements for vaccination — the two should be seen as two strategies that can be used together to significantly reduce severe disease,” Pekosz said.

Patients take four pills twice a day for five days. Side effects were reported by both groups in the Merck trial, but they were slightly more common among those who received a dummy pill. The company did not specify the problems.

Earlier study results showed the drug did not benefit patients who were already hospitalised with severe disease.

The US has approved one antiviral drug, remdesivir, specifically for Covid-19, and allowed emergency use of three antibody therapies that help the immune system fight the virus. But all the drugs have to given by IV or injection at hospitals or clinics, and supplies have been stretched by the latest surge of the delta variant.

Health experts, including Fauci, have long called for a convenient pill that patients could take when Covid-19 symptoms first appear, much the way Tamiflu is given to help fight the flu. Such medications are seen as key to controlling waves of infection.

Merck’s pill works by interfering with the coronavirus's ability to copy its genetic code and reproduce itself.

The US government has committed to purchasing enough pills to treat 1.7 million people, assuming the FDA authorises the drug. Merck said it can produce pills for 10 million patients by the end of the year and has contracts with governments worldwide. The company has not announced prices.

Several other companies, including Pfizer and Roche, are studying similar drugs and could report results in the coming weeks and months.

Merck had planned to enroll more than 1500 patients in its late-stage trial before the independent board stopped it early. The results reported on Saturday included patients across Latin America, Europe and Africa. Executives estimated 10 per cent of patients studied were from the US.