FDA: Certain flea and tick medication may cause neurological problems

Henrietta Strickland
September 22, 2018

Keeping your dog or cat up to date with preventative treatments so they remain free of fleas and ticks is something that every responsible pet owner should do, but a new alert from the FDA suggests that one particular class of these drugs could cause some pretty serious adverse effects.

"Another product in this class, Credelio, recently received FDA approval".

The agency's alert concerns drugs in the isoxazoline class, which includes FDA-approved medications Bravecto, Credelio, Nexgard and Simparica. All of these products contain a pesticide called isoxazoline.

While the FDA has not issued a recall on these products, they're issuing a warning to pet owners and veterinarians about the potential risks. While these treatments are considered to be generally safe and effective for use in cats and dogs, the FDA recommends pet owners consult with their veterinarian to review their pets' medical histories and determine whether a product in the isoxazoline class is appropriate for their animal.

".data received by the agency as part of its routine post-marketing activities indicates that some animals receiving Bravecto, NexGard or Simparica have experienced adverse events such as muscle tremors, ataxia, and seizures", the alert read.

Pet owners should contact a vet if their dog or cat has an adverse reaction to isoxazoline products.

Although the medicines for animals had previously earned FDA approval following careful testing, the agency noted that there is always the potential for new information to emerge after the product has been used on a larger population.

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