These Tick and Flea Medications Are Causing Seizures in Dogs

As dog parents we are always trying to keep our dog safe and happy, but a new report by the FDA states we may be doing more harm than good when it comes to flea and tick prevention.

The government agency warns against drugs in the Isoxazoline class, saying they can potentially cause seizures and other neurological side effects.

FDA-approved products in this class include Bravecto, Credelio, Nexgard and Simparica.

While most dogs (and cats) won’t have any effects, the agency warns that some animals could experience seizures, tremors and complete loss of muscle control – even if they have no prior history of these disorders.

Related: How to Keep Your Dog Safe From the Everyday Toxins Lurking Around Your House

The FDA recommends talking to your veterinarian to see what flea and tick options are best for your dog.

If you think your dog may have had adverse effects from these flea and tick products, visit your vet immediately. Also, report it to FDA or the manufacturer, which is required to share these complaints with the government agency.

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

Related: Here’s What Is in Dog Food That Causes Allergies — and What to Do About It

One comment on “These Tick and Flea Medications Are Causing Seizures in Dogs

  • this is a timely article.. our beloved and beautiful dog is fighting autoimmune disease all in within days of using Nexgard.
    Last Saturday we gave our dog her Nexgard chewable for ticks.
    The vet had recommended this and our dog had taken it previously,, this time, and maybe because of a build up over time in her system, she had a horrible reaction, became lethargic within a day of the dosage, didnt want to eat and had a temp. ( Though the exact cause may never be pinpointed, there is no doubt Nexgard had a terrible reaction in her system) Vet visits everyday since for her care and blood work. She is on medications.. THERE is no worse feeling then to see my dog so sick and lethargic.. DO NOT use Nexgard. My dog is struggling and we are sick over this.. do not use this product.
    ( by the way,, the vet did say after the diagnosis, we would not be using Nexgard again for my dog)

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