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FDA Grants EUA for CLiK Extra to Prevent Screwworm

8/14/2026

Summary

FDA Authorizes Screwworm Treatment

The U.S. FDA issued an Emergency Use Authorization on August 13, 2026 for Simparica Trio to treat New World screwworm in dogs.
The EUA permits treatment only, not prevention, and Simparica Trio already covers heartworm, flea, tick, roundworm and hookworm.
The FDA warned that sarolaner can cause tremors, ataxia and seizures, so it requires a prescription for dogs with seizures.

Summary

FDA Grants EUA

FDA granted an Emergency Use Authorization on August 13, 2026 for CLiK Extra wound spray to prevent New World Screwworm in livestock and captive wildlife.
The EUA covers sheep, cattle, goats, swine, llamas, alpacas, camels, deer, elk, American bison.
CLiK Extra is applied to wounds, acts as an insect growth regulator that stops larval development, is sold over the counter, and requires producers to seek veterinary care for post-treatment infestations.

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FDA Authorizes Screwworm Treatment

The U.S. FDA issued an Emergency Use Authorization on August 13, 2026 for Simparica Trio to treat New World screwworm in dogs.
The EUA permits treatment only, not prevention, and Simparica Trio already covers heartworm, flea, tick, roundworm and hookworm.
The FDA warned that sarolaner can cause tremors, ataxia and seizures, so it requires a prescription for dogs with seizures.

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