FDA grants emergency use authorization for generic Nitenpyram tablets to treat New World screwworm in dogs and cats

The U.S. Food and Drug Administration has issued an Emergency Use Authorization for generic Nitenpyram tablets to treat New World screwworm infestations in dogs, puppies, cats and kittens that weigh at least two pounds and are at least four weeks old.

This is the first generic animal drug authorized for use against the pest, following an emergency declaration made in August 2025 as part of a broader effort to halt the spread of the infestation.

The FDA said the totality of scientific evidence supports the drug's effectiveness and that the benefits outweigh any known risks. The agency noted it has already issued ten EUAs and three conditional approvals for related countermeasures under the current administration.