Pfizer sued for patent infringement over Paxlovid

Pfizer Inc's blockbuster COVID-19 treatment Paxlovid violates an Enanta Pharmaceuticals Inc patent for its COVID drug still in development, according to a lawsuit filed Tuesday in Boston federal court.

Watertown, Massachusetts-based Enanta told the court it received the patent for its antiviral medication last week based on applications dating from July 2020. The company said it began human testing for its once-daily, oral COVID treatment in February, and that the Food and Drug Administration fast-tracked its review in March.

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Pfizer Sued For Patent Infringement Over COVID-19 Drug Paxlovid