Emergency authorization offers cattle producers protection during critical stages
Federal regulators have approved the emergency use of an existing livestock medicine to help protect cattle from a serious parasite threat. The U.S. Food and Drug Administration has issued an Emergency Use Authorization allowing IVOMEC ivermectin 1% Injection to be used to prevent infestations caused by New World screwworm in cattle.
“Protecting the health and well‑being of livestock is at the core of our mission. Emergency Use Authorization for IVOMEC® (ivermectin) 1% Injection provides cattle producers and veterinarians with an important preventive tool against New World screwworm,” said Steve Boren, Vice President, U.S. Livestock, Boehringer Ingelheim.
“We appreciate the proactive approach of the FDA and USDA in response to this emerging animal health threat and remain dedicated to supporting veterinarians, producers, and government as we work together to protect cattle herds.” said Boren.
The authorization applies to specific high-risk situations, including within 24 hours of birth, at the time of castration, or when a wound first appears. This measure is intended to protect cattle during their most vulnerable stages. The product is not approved for use in female dairy cattle producing milk for human consumption or in calves raised for veal.
New World screwworm is a destructive parasitic fly whose larvae feed on living tissue. Infestations can cause severe injury and may be fatal if not controlled quickly. While the pest is not currently present in the United States, recent detections in northern Mexico have raised concern among animal health officials and cattle producers.
The FDA determined that no adequate and approved alternative treatment is available for preventing screwworm infestations at these critical points. This makes authorization an important step in national preparedness. It is also the first time an over-the-counter product has received emergency approval for this specific purpose in cattle.
“Having worked in regions where New World screwworm is endemic, I’ve seen firsthand that effective readiness depends on access to preventive tools and strong producer education,” said Dr. Gustavo Sabatini, Global Technical Manager for Ruminant Parasiticides at Boehringer Ingelheim.
“Screwworm strikes cattle when they are most vulnerable, including at birth, and demands more labor‑intensive management on the ground. That’s why prevention is essential – not only to protect animal health, but also to safeguard the food supply and the livelihoods of cattle producers,” said Sabatini.
Industry leaders say the authorization supports early prevention rather than costly treatment after infestation occurs. Preventive tools reduce labor demands, protect animal welfare, and help safeguard food supply.
The emergency authorization will remain in effect only while federal officials determine that conditions justify its use. Producers are advised to carefully follow label directions and safety guidelines, including slaughter withdrawal periods and species restrictions.
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