FDA Approves Capstar for Pet Care: A New Weapon Against Screwworm Infestations

Display of Capstar flea treatment for dogs in pet store aisle.

The Groundbreaking FDA Authorization

On September 3, 2026, the FDA made a significant move in veterinary medicine by granting emergency use authorization for Capstar (nitenpyram) tablets and a generic version for the prevention and treatment of New World screwworm (NWS) infestations in dogs and cats. This authorization is notable because it marks the first FDA-sanctioned prevention option for this dangerous parasite in pets. According to Timothy Schell, PhD, director of the FDA’s Center for Veterinary Medicine, this development fulfills a long-standing need among veterinarians and pet owners to protect their animals from these infestations.

Understanding New World Screwworm

The New World screwworm is a particularly harmful parasite that infests warm-blooded animals, including our beloved pets. The larvae of the fly Cochliomyia hominivorax lay their eggs around open wounds, leading to severe tissue damage and, if untreated, potentially fatal consequences. It's crucial for pet owners and veterinary professionals to remain vigilant for signs of infestation, especially as animal populations travel to or from areas with known outbreaks.

The Emergency Use Authorization (EUA)

This EUA allows Capstar and the generic nitenpyram to be sold over the counter in different dosages based on the pet's weight, making it accessible to a broader audience. While USDA reports show the current risk to most pets in the U.S. as low, those venturing to or returning from affected regions need to be closely monitored. The FDA bases its approvals on a thorough analysis of available scientific evidence, ensuring that the benefits of these products for preventing and treating NWS infestations outweigh the associated risks.

Implications for Veterinary Practices

For veterinary clinic owners and practitioners, the introduction of this FDA-approved prevention option provides an essential tool in the clinical fight against parasitic infestations. This development not only enhances pet health but also offers potential for increased client trust and loyalty as pet owners seek veterinarians who can provide comprehensive preventive care strategies. Implementing this new option into practice could prove beneficial in both safeguarding animal health and optimizing clinic operations.

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