Phenylpyrazole insecticides
Also appears on labels as: fipronil
Fipronil, an insecticide of the phenylpyrazole family. It blocks the chloride channels of insect nerve cells.
Watched ingredients get highlighted on every product panel you open.
- Where it comes from
- Chemical synthesis.
- Why it's in the product
- The insecticide in many spot-ons for dogs and cats, often beside an insect growth regulator.
- Safety and toxicity
- The National Pesticide Information Center lists spot-on pet products among fipronil's uses. Flagged as a pesticide active, like every active in this aisle: the flag says what the ingredient is, not that it is riskier than the rest. Follow the label's species, weight band and directions.
We make the longer argument about this one on the pesticide actives evidence page.
General reference, not veterinary advice. Dose, breed, and existing conditions change the answer, so talk to your vet before changing what your pet eats. Think we got this wrong? Tell us and we log it publicly.
Found in 5 scored products
Lowest scores first. Its presence here is not what drove those scores.
