FDA: Some flea and tick medications can increase seizure risk in pets

Maricruz Casares
Setiembre 22, 2018

Heads up, pet owners: The U.S. Food and Drug Administration on Thursday warned some flea and tick medications can potentially cause "neurological adverse events" in dogs and cats.

Flea and tick medication in the isoxazoline class includes products such as Bravecto, Nexgard and Simparica.

The FDA says the pills and chews in question are sold under the brand names Nexgard, Simparica, Bravecto and Credelio and all include the pesticide Isoxazoline.

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The affected products have been associated with neurologic adverse reactions, including muscle tremors, ataxia (the loss of full control of bodily movements), and seizures in some dogs and cats, the FDA reports. Veterinarians should use their specialized training to review their patients' medical histories and determine, in consultation with pet owners, whether a product in the isoxazoline class is appropriate for the pet.

While the FDA says the medications are still considered safe, it nevertheless issued an alert to owners and veterinarians. The FDA has been collecting and monitoring reports of these types of reactions from drugs in this class and urges pet owners who notice anything odd to contact either the FDA directly or any of the manufacturers who produce the drugs, including Merck, Elanco, Merial, and Zoetis.

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