The U.S. Food and Drug Administration (FDA) has issued emergency use authorization (EUA) for the use of Bimectin (Bimeda-manufactured ivermectin) 1% injection products for the prevention of infestations caused by New World screwworm (NWS) in cattle when administered within 24 hours of birth, at the time of castration, or at the appearance of a wound.
“This authorization reflects the FDA’s commitment to expanding generic drug options against New World screwworm,” says Timothy Schell, director of the FDA’s Center for Veterinary Medicine. “By authorizing both generic and pioneer products, the Agency is ensuring producers aren’t dependent on a single manufacturer or product to protect their herds.”
To maintain the continued safety of the food supply and avoid drug residues, it is critical that cattle producers carefully follow the 35-day slaughter withdrawal time and not administer this drug in lactating dairy cows and calves that will be processed for veal.
Based on the totality of the scientific evidence available, the FDA has concluded it is reasonable to believe that Bimectin injection may be effective for the prevention of NWS myiasis in certain cattle when used as authorized, and the known and potential benefits of the product outweigh its known and potential risks.
Bimectin injection is a generic version of Ivomec, which was authorized in February 2026 for the prevention of NWS myiasis in cattle. The FDA previously approved Bimectin injection for the treatment and control of various parasites in cattle. This EUA is only for the Bimectin injection and does not authorize other dosage forms of Bimectin.
Bimectin injection is available over the counter without a prescription. Cattle producers are responsible for using Bimectin injection in accordance with the product labeling and fact sheet.
“This EUA reflects months of dedicated work by our regulatory team to secure expanded access to Bimectin (ivermectin) 1% Injection for screwworm prevention in cattle. This is the first ANADA (generic) injectable cattle dewormer to be granted an EUA for NWS,” says Dr. Eric Moore, Bimeda technical veterinarian. “We’re proud to offer producers and veterinarians a trusted, over-the-counter ivermectin injection in the same label formats they’ve relied on for years — now at a more affordable cost and with wider availability when protecting cattle against New World screwworm matters most.”
Bimectin injection is not authorized for use in lactating dairy cows or in calves that will be processed for veal.
For more information, visit BimedaUS.com/BimectinInj/EUA
