- The FDA issued an Emergency Use Authorization (EUA) for CLiK Extra (dicyclanil topical suspension) wound spray to prevent New World screwworm infestations.
- The authorization covers sheep, cattle, goats, swine and camelids, along with specified captive and captured wildlife species.
- CLiK Extra may be applied on or around wounds, including wounds associated with birth or surgical procedures.
- The product has not been shown to treat active New World screwworm infestations; animals with an existing infestation require an alternative treatment.
- Elanco says CLiK Extra will be available through standard product channels to animal health professionals, livestock producers and managers of captive and captured wildlife.
- The authorization follows earlier emergency authorizations for Elanco’s Negasunt Powder and Tanidil for New World screwworm.
The U.S. Food and Drug Administration has issued an Emergency Use Authorization for Elanco Animal Health’s CLiK Extra (dicyclanil topical suspension) wound spray as another option for preventing New World screwworm infestations in livestock and certain wildlife species.
Under the EUA, CLiK Extra can be applied on or around wounds to prevent infestations caused by New World screwworm (Cochliomyia hominivorax) larvae in sheep, cattle, goats, swine and camelids.
The authorization also covers captive and captured cervids, American bison, bighorn sheep and Sonoran pronghorn.
CLiK Extra is an unapproved product authorized for this emergency use and is not FDA approved for the indication.
Intended for prevention, not active infestations
Veterinarians and producers may use the spray on or around wounds, including wounds associated with birth and surgical procedures, to help prevent New World screwworm larvae from establishing an infestation.
The distinction between prevention and treatment is important. Elanco said CLiK Extra has not been shown to treat an active New World screwworm infestation.
If an animal’s wound is already infested, or an infestation develops following administration, an alternative treatment is necessary.
Elanco senior technical consultant M. Wayne Ayers, DVM, said frequent observation of animals and prompt wound care are important components of New World screwworm prevention.
“By checking animals as often as possible and using appropriate wound care for any noticeable lesions or sores, producers can potentially avoid conditions that might lead to New World screwworm larvae infestations,” Ayers said.
Elanco expands screwworm options
CLiK Extra joins other Elanco products made available in response to the New World screwworm threat.
Negasunt Powder and Tanidil received emergency authorizations earlier in 2026 for prevention and treatment of New World screwworm. According to Elanco, those products are available only through USDA’s Animal and Plant Health Inspection Service and its National Veterinary Stockpile, with distribution coordinated with state animal health officials and federally recognized tribal agencies.
Elanco also markets Catron IV, an EPA-registered screwworm and ear tick spray labeled to kill and control screwworm flies and maggots in several livestock species.
Unlike the emergency-stockpile distribution described for Negasunt and Tanidil, Elanco said CLiK Extra will be available through standard product channels to animal health professionals, livestock producers and people managing eligible captive and captured wildlife.
Authorization carries food-animal restrictions
The EUA includes several restrictions relevant to food-producing animals.
Sheep, cattle, goats, swine, cervids, American bison and bighorn sheep treated with CLiK Extra cannot be slaughtered or harvested for human consumption within 86 days of treatment.
Treated Sonoran pronghorn and camelids cannot be used for human consumption. A milk discard time has not been established, so the product should not be used in animals producing milk for human consumption.
A withdrawal period also has not been established for pre-ruminating calves. Treated calves and calves born to treated cows cannot be processed for veal.
The authorization remains in effect only while the federal declaration supporting the emergency use remains in place, unless the authorization is terminated or revoked sooner.
Elanco directs veterinarians and producers to the CLiK Extra New World Screwworm Fact Sheet for complete authorized-use and safety information.
Information sourced from the company’s press release.
