FDA Grants Emergency Approval for First OTC Treatment for New World Screwworm in Pets

Officials say the FDA-approved generic drug kills most screwworm larvae within hours of administration. The medication is available in two dosage strengths and is administered based on an animal’s weight.

WASHINGTON, D.C. (RFD NEWS) — Efforts to combat New World screwworm received another boost this week after the Food and Drug Administration (FDA) issued an Emergency Use Authorization for the first generic over-the-counter (OTC) treatment approved for dogs and cats exposed to the pest.

The medication is available in two dosage strengths and is administered based on an animal’s weight. According to FDA officials, the treatment kills most screwworm larvae within hours of administration and is followed by a second dose.

The authorization comes as federal and state animal health agencies continue efforts to contain the pest following multiple confirmed cases in the United States.

Federal officials say the authorization provides veterinarians, pet owners, and animal health professionals with an additional tool as containment and eradication efforts continue in response to recent detections in Texas.

In a statement, U.S. Secretary of Health & Human Services Robert F. Kennedy Jr. said the approval reflects the government’s continued focus on preventing the pest’s spread:

“The U.S. Government is maintaining an aggressive approach to stop the spread and eradicate this pest. When I signed the initial emergency declaration back in August 2025, we established a proactive defense. Today’s authorization is the latest tactical tool in that ongoing containment strategy — providing an affordable, fast-acting treatment for dogs and cats in affected areas.”

Officials say the treatment adds another layer of protection as animal health authorities work alongside the USDA and state agencies to contain the New World screwworm and prevent further infestations.

The authorization applies to companion animals, while separate treatment and prevention strategies remain in place for livestock producers monitoring cattle and other susceptible animals in affected regions.

Marion is a digital content manager for RFD News and FarmHER + RanchHER. She started working for Rural Media Group in May 2022, bringing a decade of digital experience in broadcast media and some cooking experience to the team.

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