Effipro spot on for cats is used for the treatment of flea (Ctenocephalides spp.) & tick (Dermacentor reticulatus) infestations. Effipro cats has a persistent acaricidal efficacy for up to 2 weeks against ticks (Rhipicephalus sanguineus, Ixodes ricinus, Dermacentor reticulatus). If ticks of some species (Rhipicephalus sanguineus & Ixodes ricinus) are present when the product is applied, all the ticks may not be killed within the first 48 hours but they may be killed within a week.