Sarolaner

Simparica is used to prevent and treat flea infestations (Ctenocephalides felis and C. canis) and to treat and control infestations with multiple tick species, including Amblyomma americanum (Lone Star tick), Dermacentor variabilis (American dog tick), Dermacentor reticulatus (brown dog tick), Ixodes hexagonus, Ixodes ricinus, and Rhipicephalus sanguineus. It may also be used as part of a treatment strategy for flea allergy dermatitis and sarcoptic mange.

Simparica contains sarolaner, an isoxazoline compound that works by blocking ligand-gated chloride channels, specifically those gated by the neurotransmitter gamma-aminobutyric acid (GABA), in the nervous system of fleas and ticks. This disruption causes uncontrolled neural activity, resulting in paralysis and death of the parasites. The medication is absorbed systemically and distributed through the dog's bloodstream, where it is ingested by feeding parasites.

Simparica is for use in dogs only and should not be given to cats or other animals. The medication is administered orally once monthly with or without food. Common side effects may include vomiting, diarrhea, lethargy, and in rare cases, neurological effects such as tremors or seizures, particularly in dogs with a history of neurological disorders. Always consult with a veterinarian before use, especially for dogs with a history of seizures or neurological conditions, and ensure proper dosing based on the dog's weight.