Fipnil Spot-on Solution for Cats Fipnil Spot-on Solution for Cats treats fleas infestations in cats & kittens from 2 months of age. It contains Fipronil, the same active ingredient as Frontline, to protect fleas for up to 5 weeks. It can also be used as part of a treatment strategy for the control of Flea Allergy Dermatitis (FAD) where this has been previously diagnosed by a veterinary surgeon. While Fipnil Spot-on Solution for Cats has not demonstrated any immediate killing effect against ticks, it has shown to have an effect against Dermacentor reticulatus, so if ticks of this species are present when the product is applied, not all the ticks may be killed within the first 48 hours but they will be killed within a week. The dose of Fipnil Spot-on Solution for Cats is one pipette per cat. Animals should be weighed accurately prior to treatment to ensure that they receive the correct dose.