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FDA Authorizes Capstar and Generic Nitenpyram for Prevention and Treatment of New World Screwworm in Dogs and Cats

FDA issued an Emergency Use Authorization for Capstar (nitenpyram) and revised the EUA for generic Nitenpyram Tablets so both products may be used to prevent and treat New World screwworm myiasis in dogs, puppies, cats, and kittens that weigh at least two pounds and are at least four weeks old. FDA says most U.S. dogs and cats remain at low risk because confirmed cases are geographically limited.

Primary source: FDA Center for Veterinary Medicine
Published: 2026-09-03
Reviewed and summarized by the AlmostAVet Editorial AI
Sep 3 2026
At a Glance

What This Means for Different Readers

Three quick summaries of the same article, tailored for different readers.

🏠
Pet Owner

A New Screwworm Prevention Option Is Now Authorized for Dogs and Cats

FDA issued an Emergency Use Authorization for Capstar (nitenpyram) and revised the EUA for generic Nitenpyram Tablets so both products may be used to prevent and treat New World screwworm myiasis in dogs, puppies, cats, and kittens that weigh at least two pounds and are at least four weeks old. FDA says most U.S. dogs and cats remain at low risk because confirmed cases are geographically limited. The important distinction is that this is not a signal that every U.S. pet suddenly needs extra medication. Risk is still concentrated by geography and travel history, so current location and exposure matter more than the headline alone.

The original source has the exact product, guidance, or study details behind the update.
🧪
Vet Tech

Capstar and Generic Nitenpyram Gain NWS Prevention-and-Treatment EUA

FDA issued an Emergency Use Authorization for Capstar (nitenpyram) and revised the EUA for generic Nitenpyram Tablets so both products may be used to prevent and treat New World screwworm myiasis in dogs, puppies, cats, and kittens that weigh at least two pounds and are at least four weeks old. FDA says most U.S. dogs and cats remain at low risk because confirmed cases are geographically limited. Triage and discharge conversations now need to distinguish prevention from treatment, confirm age and weight eligibility, and reinforce that suspected infestation is an urgent exam rather than an OTC-only problem.

Open the source for the operational details, eligibility limits, methods, or workflow implications.
🎓
Pre-Vet

FDA Expands Nitenpyram EUA From Treatment to Prevention of NWS Myiasis

FDA issued an Emergency Use Authorization for Capstar (nitenpyram) and revised the EUA for generic Nitenpyram Tablets so both products may be used to prevent and treat New World screwworm myiasis in dogs, puppies, cats, and kittens that weigh at least two pounds and are at least four weeks old. FDA says most U.S. dogs and cats remain at low risk because confirmed cases are geographically limited. The update is a clean example of how an EUA can be revised as evidence and outbreak needs change, while still preserving explicit limits on species, age, weight, and indication.

The source is the best place to inspect the regulatory scope, study design, and limitations.
Why This Matters
Emergency authorization is still product-, species-, age-, weight-, and indication-specific. Visible maggots, foul odor, or rapidly worsening wounds require immediate veterinary care even when a preventive product is available.