Simparica is a fast-acting oral flea and tick preventative that begins killing fleas and ticks within hours of administration and remains effective for one month to prevent re-infestations. It is indicated for the treatment and prevention of flea infestations (Ctenocephalides felis), and the treatment and control of tick infestations [Amblyomma americanum (Lone Star tick), Amblyomma maculatum (Gulf Coast tick), Dermacentor variabilis (American dog tick), Ixodes scapularis (deer tick/black-legged tick), and Rhipicephalus sanguineus (brown dog tick)]. Simparica begins to kill adult fleas within 3 hours and ticks within 8 hours of administration. Treatment with Simparica may begin at any time of the year and is safe to use year-round without interruption. Simparica is given monthly and requires a prescription from your veterinarian.