Sept 1 (Reuters) – Pfizer Inc (PFE.N) and Merck & Co Inc (MRK.N) announced on Wednesday new trials of their experimental oral antiviral drugs for COVID-19 as the race to develop an easy-to-administer treatment for the potentially fatal illness heats up.
Pfizer said its latest mid-to-late-stage trial will enroll 1,140 non-hospitalized adults diagnosed with coronavirus infection who are not at risk of severe illness. Patients in the trial will be given Pfizer’s pill, known as PF-07321332, and a low dose of ritonavir, an older medication widely used in combination treatments for HIV infection.
Pfizer’s drug is designed to block the activity of a key enzyme that is needed for the coronavirus to multiply.
Merck said its new trial will study experimental drug molnupiravir for the prevention of COVID-19 among adults in the same household as someone diagnosed with symptomatic coronavirus infection. Merck and partner Ridgeback Biotherapeutics are already conducting a late-stage trial of the treatment in non-hospitalized patients to see if it reduces the risk of hospitalization or death.
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