FDA Grants First-Ever Emergency Authorization for Animal Drug to Protect Dogs from Deadly Parasite
Source: FDA
In a milestone moment for animal health, the U.S. Food and Drug Administration has issued its first-ever Emergency Use Authorization (EUA) for a veterinary medicine. The agency approved Credelio (lotilaner) chewable tablets for dogs facing infection from the New World screwworm, a destructive parasite capable of causing severe tissue damage and even death if untreated.
This decision marks a new chapter in rapid-response veterinary care. Traditionally used to combat fleas and ticks, Credelio is now authorized for emergency use against a far more dangerous threat following scientific review showing that the drug may help treat active screwworm infestations.
FDA Commissioner Marty Makary, M.D., M.P.H., explained the urgency behind the authorization, stressing the agency’s need to stay ahead of emerging animal health risks. Dr. Timothy Schell, who leads the FDA’s Center for Veterinary Medicine, reinforced that message, noting that the agency is reviewing additional emergency requests for other species at risk.
While the majority of U.S. dogs face low risk, pets that live near or travel to regions close to the U.S.–Mexico border are more vulnerable. Although the parasite had long been eradicated from North and Central America, confirmed spread since 2022 has raised alarm among veterinarians, wildlife agencies, and livestock producers. The New World screwworm targets warm-blooded animals, making it a potential threat not only to pets but also to agriculture and wildlife.
The authorization comes after the Secretary of Health and Human Services declared the parasite a potential public health emergency in August 2025. That declaration enabled the FDA to deploy emergency pathways typically reserved for fast-moving disease threats.
Credelio’s active ingredient, lotilaner, belongs to the isoxazoline class of antiparasitic drugs. These medications are widely used and generally safe, but the FDA reminds pet owners that rare neurological side effects can occur. Because of this, the treatment remains prescription-only, ensuring veterinarians can monitor each case closely.
Manufactured by Elanco US Inc., Credelio will remain under EUA status until federal authorities lift the emergency declaration or revoke authorization based on future evidence and disease trends. For now, its approval represents a proactive step in protecting companion animals and supporting wider biosecurity efforts.
As health officials continue monitoring the parasite’s movement, the authorization underscores a growing reality — safeguarding animal health is increasingly intertwined with protecting public health and national food systems.
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Source: FDA
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