Federal regulators have authorized another emergency treatment for New World screwworm infestations in dogs, expanding the veterinary toolkit even as the FDA says the parasite remains contained within the United States.
The FDA issued an Emergency Use Authorization on August 13, 2026, for Simparica TRIO, a chewable tablet combining sarolaner, moxidectin, and pyrantel, for the treatment of New World screwworm infestations in dogs and puppies. It joins a lengthening list of authorized and conditionally approved products for pets, including Credelio Quattro for dogs, Credelio CAT, NexGard, NexGard COMBO, and generic nitenpyram tablets. Simparica TRIO is authorized for treatment only, not prevention, and it is available by prescription from a licensed veterinarian.
