FDA Approves New Drug for Screwworm in Pets

FDA just approved nitenpyram, a generic drug, as the first-ever treatment for New World screwworm in dogs and cats — a flesh-eating parasite that lays eggs in open wounds. Though previously approved for fleas under the brand Capstar, this emergency authorization speeds deployment for urgent cases. The drug kills most larvae within hours, with a second dose recommended six hours later, but it’s short-acting and won’t prevent new infestations. Vets may still need to manually remove any remaining maggots. Once considered eradicated in the U.S., screwworm outbreaks are resurfacing — even in pets — making this approval a critical win for pet owners and ranchers alike.

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