Simparica: Warning – Dangerous Drug For Dogs

Zoetis the company that manufactures the flea and tick drug Simparica, have been falsely claiming that the drug is safe. In truth, the drug is known to cause deadly seizures and ataxia in pets who take the drug.

Even the FDA and AVMA knew of the hazardous side effects linked to Simparica, yet still approved it to be used for the treatment of fleas and ticks.

Four flea, tick products linked to seizures, ataxia

Posted Oct. 31, 2018

Four flea and tick products may cause seizures, tremors, and lost coordination in some cats and dogs.

Food and Drug Administration officials have received thousands of reports of adverse events connected with three products—Bravecto, Nexgard, and Simparica—containing drugs in the isoxazoline class. The agency approved a fourth product, Credelio, containing a drug in the class this year.

“The FDA is working with manufacturers of isoxazoline products to include new label information to highlight neurologic events because these events were seen consistently across the isoxazoline class of products,” a Sept. 20 announcement states.

The agency has approved all four products since 2013 for treatment and prevention of flea infestations and treatment and control of tick infestations. They are safe and effective for most pets, but veterinarians should use patient medical histories to decide whether isoxazoline-class drugs are appropriate, the announcement states.

Siobhan DeLancey, who is a spokeswoman for the FDA Center for Veterinary Medicine, said the agency has received about 5,400 reports of adverse events connected with the drugs.

She provided a statement that said agency officials are seeing reports of neurologic events at similar rates across the isoxazoline product class, when those reports are compared with sales data. But the agency is unable to compare among products because it’s impossible to know how many of the doses sold have been administered.

Researchers who conducted preapproval studies saw some of the neurologic signs, and some of the product labels already note that potential, DeLancey said. In the reports of adverse events since approval, some animals developed seizures with no known history of them.

Most of the reports involve dogs, but whether the risk is higher in dogs or cats is unknown. Only one of the products—Bravecto—is approved for use in cats.

FDA reports that summarize evidence used toward approval of the four products include descriptions of seizures, tremors, ataxia, and lethargy among a small number of dogs and ataxia in a few cats involved in clinical trials. Results of one trial for Simparica involving a small number of 8-week-old puppies, for example, indicated that those that received higher doses were more likely to have neurologic signs.

Do not give your companion animals these medications. The seizures are a lifelong side effect. It does not go away at all. Once neurological damage takes place there is no reversing the damage. There is only a long road of treatments via more medication.

There’s proof of Simparica induced seizures all over the Web. Youtube for an example of a recent victim of simparica can be found here:

For the correct information on dealing with seizures. You are supposed to move everything dangerous out of their way. Cushion their head as well as gently hold them and comfort them, Until the seizure has passed.

If your companions are suffering from seizures it’s best to take them to a Veterinarians Office immediately after the episode. Preferably a different veterinarian who didn’t prescribe the medication.


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The Guardian - Gwen Cho

Vocal and Active for animal rights and welfare. I work with the animal welfare community offline and I am new to journalism. I'm also a volunteer at NYC no-kill shelters as well as humanitarian shelters.

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