Effipro spot on for cats is used for the treatment of flea ctenocephalides spp and 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 and 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