FDA Authorizes Emergency OTC Treatment for New World Screwworm in Pets

The Food and Drug Administration (FDA) has issued an emergency use authorization for a generic over-the-counter tablet designed to treat New World screwworm (NWS) infestations in cats and dogs. This regulatory move marks the first time a generic animal medication has been approved to combat the parasite, which has recently reappeared in the United States after being eradicated in the 1960s. Recent reports from Texas and New Mexico have confirmed at least seven cases involving livestock and domestic animals, prompting federal authorities to bolster containment efforts.

New World screwworm larvae are highly destructive, as they burrow into the living tissue of warm-blooded animals through open wounds. If left untreated, these infestations cause severe physical trauma and significant suffering. The newly authorized nitenpyram tablets are designed to act rapidly, killing the majority of larvae within hours of the initial dose. While the treatment provides a critical tool for pet owners, the FDA notes that it does not prevent reinfestation and may require follow-up care from a veterinarian to ensure all larvae are removed.

This development is a significant component of the broader federal strategy to prevent the parasite from establishing a foothold in the U.S. again. Health and Human Services Secretary Robert F. Kennedy Jr. emphasized that providing an affordable, accessible treatment directly to pet owners is essential to the containment strategy. While federal officials maintain that the overall risk to the general pet population remains low, the authorization provides a necessary safeguard for animals located in or near the affected regions, protecting both domestic pets and the stability of the livestock industry.