FDA-Approved Tick & Flea Treatment Can Trigger Seizures In Pets, Report Health Officials


Pet owners should be high attention because health officials are warning them and veterinarians as well. It seems that certain flea and tick medications can trigger seizures and more neurological effects in cats and dogs.

A few days ago, The U.S. Food And Drug Administration has issued a warning to alert pet owners and vets about the potential for muscle tremors and seizures in dogs and cats when they are treated with flea and tick drugs which are included in the isoxazoline class.

The medication includes Bravecto, Credelio, Nexgard, and Simparica, and it’s also important to know that all of these are all sold in Canada.

Health Canada said it is aware of the FDA’s warning about the tick and flea medication and is “working with Canadian manufacturers of drugs belonging to the isoxazoline class to include new labeling information that neurological adverse events have been reported in animals receiving this class of drug.”

Such drugs are FDA-approved 

The FDA has previously approved the drugs for treatment and prevention of fleas and ticks in cats and dogs.

The FDA stated that the medications had been safely used in the majority of pets, but it still recommends pet owners to talk with their vets before using such medicines on their own animals.

“The FDA considers products in the isoxazoline class to be safe and effective for dogs and cats but is providing this information so that pet owners and veterinarians can take it into consideration when choosing flea and tick products for their pets,” the organization stated on its website.

Even if most cats and dogs did not have any neurological reaction, seizures could occur in animals without a prior history, according to the FDA. This is the reason for which high caution is really required.

The FDA is currently working with manufacturers of such products in order to support including new data on the products’ labels to highlight the potential adverse effects on pets.


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