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Explainer: How does Merck's COVID-19 pill compare to Pfizer's?

An experimental COVID-19 treatment pill, called molnupiravir and being developed by Merck & Co Inc and Ridgeback Biotherapeutics LP. [Reuters]

Rival antiviral pills from Pfizer Inc and Merck & Co that demonstrated efficacy in trials of adults with Covid-19 who are at high risk of serious illness are now both in use. The drugs are being studied to see if they can prevent infection in people exposed to the virus.

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