health
FDA Clears Emergency Use of Drug to Fight Screwworm Infections in Pets
June 12, 2026 / 10:42 AM EDT / CBS News
TL;DR
- FDA grants emergency use authorization for nitenpyram to treat New World screwworm in dogs and cats.
- Nitenpyram is the first generic animal drug approved for this purpose.
- The medication is suitable for dogs and cats weighing at least two pounds and aged at least four weeks.
- Nitenpyram was previously approved for flea treatment under the brand name Capstar.
- Studies showed nitenpyram expelled most maggots, with remaining larvae dying.
- New World screwworm, previously thought eradicated in the U.S., has reappeared in Texas cattle and a New Mexico dog.
- The drug kills larvae within hours, but a second dose is recommended six hours later.
- Nitenpyram's effects are short-acting and do not prevent new infestations.