A vet prescription is required for the medicine you have chosen. Frontline Combo Spot On is to be used against infestations with fleas, ticks and/or biting lice. Elimination of fleas (Ctenocephalides spp.) & insecticidal efficacy against new infestations with adult fleas persists for 8 weeks. Prevention of the multiplication of fleas by inhibiting the development of eggs (ovicidal activity) & larvae & pupae (larvicidal activity) originating from eggs laid by adult fleas for 8 weeks after application. Elimination of ticks (Ixodes ricinus, Dermacentor variabilis, Rhipicephalus sanguineus). The product has persistent acaricidal efficacy for up to 4 weeks against ticks. Elimination of biting lice (Trichodectes canis). The product can be used as part of a treatment strategy for the control of Flea Allergy Dermatitis (FAD). If you do not yet have a prescription then you can print out the following blank veterinary Prescription Form which you can ask your vet to fill in when you next visit. Please note that changes to legislation in 2005 means that Vets must offer you a prescription to take away & not just supply you the medicines directly. This is to ensure more competition & lower prices for you.