Top Vet Warns About Trifexis and Comfortis

Dr. Andrew Jones, DVM, better known as the “Online Vet,” is warning dog parents about two relatively new meds: Trifexis and Comfortis.

These are both chewable tablets administered to pooches on a monthly basis. Tefiexis is prescribed to treat fleas, hookworm, roundworm, whipworms and heart worm, while Comfortis is used specifically to treat fleas.

According to Dr. Jones, the FDA has recorded approximately 340 dog deaths associated with these meds, with reports of side effects in 26,000 pets.

The main culprit appears to be the ingredient spinosad, a natural insecticide in use in the U.S. since the late 1990s.

There have been reports of numerous effects from these meds including vomiting, diarrhea, convulsions, depression, lethargy, loss of appetite, among many others, and death.

The doc said on his Veterinary Secrets website: “Clearly, there are serious problems with this drug, and the FDA should be warning pet owners and veterinarians about these potential side effects before more dogs become ill or die.”

For more info and a full list of side effects, please see the doc’s website.

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