FDA warns common flea and tick meds linked to neurological problems in dogs and cats

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(WPEC / CBS News) -- The U.S. Food and Drug Administration is alerting pet owners and veterinarians that some flea and tick medications can cause adverse reactions in dogs and cats.

Olha Schedrina / The Natural History Museum / (CC BY 4.0): Flea under a microscope

Some animals receiving drugs in the isooxazoline class have experienced adverse events such as muscle tremors, ataxia, and seizures, according to the FDA.

The medicine includes Bravecto, Nexgard, and Simparica. Another product in this class is Credelio, which recently received FDA approval. The FDA says these products are approved for the treatment and prevention of flea infestations, and the treatment and control of tick infestations.

If your dog or cat experiences and adverse reaction, they say you should contact your veterinarian.

To report suspected adverse drug events for these products and/or obtain a copy of the Safety Data Sheet (SDS), or for technical assistance, you can contact the manufacturer(s):

Merck Animal Health (Bravecto): 800-224-5318
Elanco Animal Health (Credelio): 888-545-5973
Merial (Nexgard): 888-637-4251
Zoetis (Simparica): 888-963-8471

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