US health regulators have authorised 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 announcement on Merck's molnupiravir comes one day after the agency cleared a competing drug from Pfizer.Pfizer's pill, Paxlovid, is likely to become the first-choice treatment against the virus, because of its superior benefits and milder side effects.
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