Virbac Effipro Spot-On for Cats Effipro Spot-On for Cats is for the prevention & treatment of fleas & ticks in cats & kittens over 2 months of age & weighing over 1kg. Effipro Spot-On for Cats contains 50mg fipronil, which is effective against fleas for up to 5 weeks & ticks for up to 2 weeks. It will usually kill fleas within 24 hours & ticks within 48 hours. If some species of tick (Rhipicephalus sanguineus & Ixodes ricinus) are present prior to application, they may not be killed within 48 hours, but may be killed within a week. It will not prevent ticks from attaching to your cat, but if it has been applied prior to exposure to ticks, they will be killed in 24-48 hours, usually before engorgement. Effipro Spot-On 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. Effipro Spot-On is quick & easy to apply in new leak-free pipettes & leaves no greasy residue. This product contains 4 x 0.5ml pipettes, which is 4 treatments. For optimal control of fleas & ticks, the treatment schedule with Effipro Spot-On can be based on your local conditions, but treatment should not be repeated within 4 weeks. Fleas from pets often infest the animal's basket, bedding & regular resting areas such as carpets & soft furnishings, so in cases of massive infestation, it is recommended that you treat these areas with a household flea spray & vacuum regularly. For optimum control of flea problems in a multi-pet household, all dogs & cats in the household should be treated with a suitable insecticide.