Elanco Secures FDA Authorization for Clik Extra for New World Screwworm as Iconic Sheep Brand Enters Emergency Veterinary Response

The FDA has granted Elanco Emergency Use Authorization for CLiK Extra (dicyclanil topical suspension) wound spray for application on or around wounds to prevent New World screwworm infestations in sheep, cattle, goats, swine, camelids and captive wildlife species — a product whose active ingredient dicyclanil was originally developed and commercialised by Novartis Animal Health as CLiK, one of the most successful sheep ectoparasiticide brands in European and Australasian markets before Elanco acquired the Novartis Animal Health portfolio in 2015.

Nine weeks after USDA confirmed New World screwworm in a calf in Zavala County, Texas, the United States now has a third EUA-backed veterinary tool in its outbreak response, with CLiK Extra authorised on August 7, 2026.

CLiK Extra joins Elanco’s Negasunt Powder and Tanidil in the company’s New World screwworm response portfolio, both of which received emergency authorizations earlier in 2026. Both CLiK Extra and Negasunt Powder are distributed exclusively through USDA’s Animal and Plant Health Inspection Service and its National Veterinary Stockpile, in coordination with state animal health officials and federally recognised tribal agencies.

CLiK Extra’s mechanism is critical to understand in the US outbreak context: the product prevents infestations but does not treat an active one. If larvae are already present when the spray is applied, producers must use alternative products. An 86-day harvest restriction applies, with a treatment interval of at least one hour between applications.

The brand carries significant industry heritage. CLiK and CLiK Extra were developed by Novartis Animal Health’s research team as dicyclanil-based insect growth regulators, providing long-lasting prevention of blowfly strike in sheep across the UK, Ireland, Australia and New Zealand. Elanco acquired the entire Novartis Animal Health portfolio — including CLiK — in its landmark 2015 acquisition, inheriting one of the most trusted sheep ectoparasiticide brands in global agriculture.

Acting FDA Commissioner Kyle Diamantas said the authorization gives American farmers, ranchers, veterinarians and wildlife managers the tools needed to fight back as the outbreak continues across Texas and New Mexico.

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