FDA Issues Emergency Use Authorizations for Drugs to Treat New World Screwworm in Dogs and Cats

U.S. Food and Drug Administration sent this bulletin at 02/18/2026 01:29 PM EST

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US Food and Drug Administration

FDA Issues Emergency Use Authorizations for Drugs to Treat New World Screwworm in Dogs and Cats

February 18, 2026

FDA Issues Emergency Use Authorizations for Drugs to Treat New World Screwworm in Dogs and Cats

Today the U.S. Food and Drug Administration issued two Emergency Use Authorizations (EUAs) – one for NexGard (afoxolaner) chewable tablets for the treatment of New World screwworm (NWS) infestations (myiasis) in dogs, and the second for NexGard COMBO (esafoxolaner, eprinomectin, and praziquantel topical solution) for the treatment of NWS myiasis in cats.

For NexGard, the agency has concluded that based on the scientific evidence available, it is reasonable to believe that NexGard may be effective in the treatment of NWS myiasis in dogs and puppies, and the known and potential benefits of the product outweigh its known and potential risks.

For NexGard COMBO, the agency has concluded that based on the scientific evidence available, it is reasonable to believe that NexGard COMBO may be effective in the treatment of NWS myiasis in cats and kittens, and the known and potential benefits of the product outweigh its known and potential risks.

These EUAs will be effective until they are revoked or the HHS Secretary terminates the declaration that the potential public health emergency presented by NWS justifies the emergency use authorization of animal drugs for NWS.

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