US EditionFDA Authorizes Drug to Treat Cats and Kittens Infected with New World Screwworm
Credelio CAT, containing lotilaner, is now FDA-approved for treating New World screwworm in cats, addressing an emerging parasite threat near the U.S.-Mexico border.
- On Nov. 21, 2025, the U.S. Food and Drug Administration issued an Emergency Use Authorization for Credelio CAT to treat New World screwworm infestations in cats and kittens.
- Since 2022, New World screwworm has progressed north and confirmed cases near the U.S.-Mexico border raise exposure risk for outdoor cats; the FDA's earlier October EUA for dogs informed the feline authorization.
- Laboratory and field studies on lotilaner, an isoxazoline, indicated 100% larvicidal effectiveness in the Credelio CAT study in two Malaysian cats and supported by lotilaner studies in 11 naturally infested dogs in Brazil.
- Available by prescription only, Credelio CAT requires licensed veterinarians to monitor for isoxazoline-associated neurologic risks, and the EUA is limited to the emergency declaration duration.
- Elanco's messaging on preparedness states the EUA helps veterinarians and cat owners address the feline treatment gap, with research showing fewer vet visits for cats than dogs and recommendations for wound prevention through flea and tick protection.
53 Articles
53 Articles
Johnson City Press
Elanco's Credelio™ CAT (lotilaner) Receives First FDA Emergency Use Authorization (EUA) for Treatment of New World Screwworm (NWS) in Cats
EUA to Treat Cats for NWS Issued Prior to Fly Being Detected in the U.S.; Action Prepares Veterinarians and Pet Owners with Treatment Options
FDA authorizes drug to treat cats and kittens infected with New World screwworm
In October, the U.S. Food and Drug Administration (FDA) for the first time ever issued an Emergency Use Authorization (EUA) for a drug to treat dogs and puppies infected with the parasite New World screwworm (NWS). Now it’s doing the same approval to treat kittens and cats.
FDA authorizes drug to treat cats and kittens infected with New World screwworm
In October, the U.S. Food and Drug Administration (FDA) for the first time ever issued an Emergency Use Authorization (EUA) for a drug to treat dogs and puppies infected with the parasite New World screwworm (NWS). Now it’s doing the same approval to treat kittens and cats.
FDA authorizes drug to treat cats and kittens infected with New World screwworm
In October, the U.S. Food and Drug Administration (FDA) for the first time ever issued an Emergency Use Authorization (EUA) for a drug to treat dogs and puppies infected with the parasite New World screwworm (NWS). Now it’s doing the same approval to treat kittens and cats.
FDA authorizes drug to treat cats and kittens infected with New World screwworm
In October, the U.S. Food and Drug Administration (FDA) for the first time ever issued an Emergency Use Authorization (EUA) for a drug to treat dogs and puppies infected with the parasite New World screwworm (NWS). Now it’s doing the same approval to treat kittens and cats.
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