Eprinomectin is a veterinary macrocyclic lactone parasiticide/endectocide used topically in cattle formulations such as Eprimectin Pour-On. It provides broad-spectrum control of internal and external parasites in beef and dairy cattle, including lactating animals. The product category is listed as an OTC animal drug under an abbreviated new animal drug application pathway.
The FDA has expanded animal drug options for New World screwworm through conditional approvals and emergency use authorizations. The agency lists products for cattle, dogs and cats and says its guidance page will be updated as more drugs move through the system.
The U.S. Food and Drug Administration issued two Emergency Use Authorizations on February 18, 2026, for NexGard products to treat New World screwworm infestations in dogs and cats.
