Quick Takeaways:
- The FDA has issued an Emergency Use Authorization (EUA) for Ivermectin Liquid for Horses to help prevent short-term infestations of New World screwworm (NWS) in horses. The product may be used within 24 hours of birth or during initial wound care and is authorized only for horses.
- NWS larvae feed on the living tissue of warm-blooded animals, with newborn animals and those with open or healing wounds particularly vulnerable. The FDA determined that the product’s potential benefits outweigh its risks for short-term prevention, but it is not authorized to treat existing infestations.
- The prescription-only product provides prevention for no more than 24 hours and should be used alongside measures such as bandaging, repellents, and fly control. The EUA marks the FDA’s 11th authorization against NWS and remains effective until revoked or the relevant public health emergency declaration ends.
Why It Matters?
The EUA makes ivermectin liquid a short-term, horse-only screwworm prophylaxis tool, adding another regulated option to the NWS armamentarium and slightly strengthening biosecurity for foals and wounded horses, but because protection lasts only 24 hours and does not treat active infestations, it mainly nudges more prompt, protocol-based prevention (paired with bandaging, repellents, and fly control) rather than fundamentally changing NWS management or long‑term market dynamics.
Source: FDA
