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Merck says Covid antiviral pill halves risk of hospitalisation or death


Newsletter: The Road to Recovery

Merck said it would ask US regulators to authorise the first antiviral pill to treat Covid-19 after a late-stage clinical trial showed the drug cut the risk of hospitalisation or death in half.

If the US Food and Drug Administration authorises the drug, called molnupiravir, it would be the first treatment of its kind — a twice-daily pill prescribed for five days to patients who have recently been diagnosed with Covid.

The US pharmaceuticals company said on Friday that it had stopped the phase 3 clinical trial early after an interim analysis showed that 7.3 per cent of patients on the drug had died or been hospitalised, versus 14.1 per cent of those receiving a placebo.

The decision to halt the study was taken following a recommendation from an independent committee of scientists monitoring the trial and after consultations with the FDA.

The interim analysis of data from 775 patients showed that none of the participants receiving molnupiravir had died during the first 29 days of the study, versus eight who received a placebo, Merck said.

Merck said it would apply for emergency use authorisation for the drug in the US within the next two weeks and seek a green light in several other countries.

The drug demonstrated “consistent efficacy” across multiple coronavirus variants, including the highly transmissible Delta strain that has led to a fresh wave of Covid cases in several countries, Merck said.

An FDA authorisation would pave the way for general practitioners to begin prescribing the pill to recently diagnosed “outpatients” who have not yet been hospitalised.

“Being the first oral antiviral in the outpatient setting to show a benefit is pretty remarkable,” said Nick Kartsonis, senior vice-president of clinical research at Merck. “It’s clearly an important point in the evolution of our fight against Covid-19.”

Merck said it expected to produce 10m courses of the treatment by the end of the year. The US government recently signed a deal to procure approximately 1.7m courses of the drug and the pharma company also has agreements in place with several other countries.

Merck is developing the antiviral treatment in partnership with Ridgeback Biotherapeutics, a small Miami-based biotech company run by a wife-and-husband team. The companies are engaged in a race with Pfizer to develop a pill that can be prescribed shortly after infection with the intention of preventing severe disease.

Health experts have predicted that such a drug could be a vital tool to help hasten the end of a pandemic that has cost more than 4.7m lives worldwide.

So far, the only treatments approved for Covid in the US are monoclonal antibodies developed by Regeneron, Eli Lilly and GlaxoSmithKline, which are typically given via intravenous infusions.

Molnupiravir was studied in patients who had tested positive for Covid within the first five days of showing symptoms, who also had at least one “risk factor” such as old age, obesity or diabetes that meant they might become seriously sick.

However, that relatively short timeframe could present a challenge to healthcare systems because many patients do not receive a confirmed diagnosis of Covid until well after the five-day window.

An earlier trial of molnupiravir in hospitalised patients was stopped after disappointing results.

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