Clear Spot Spot On Solution for Cats is for the prevention & treatment of flea infestations. With immediate insecticidal effect & persistent insecticidal activity for up to 4 weeks in dogs this product can be used to control Flea Allergy Dermatitis. Dosage: 4kg body weight should receive 1 pipette of Clearspot 40mg Spot-On Solution for Small Cats.4kg bodyweight Clearspot 80mg Spot-On Solution for Large Cats Use 1 x 0.8 ml pipette The product shows immediate insecticidal effect & persistent insecticidal activity for up to 4 weeks in cats. Should re-treatment become necessary earlier than 4 weeks, do not re-treat more frequently than weekly.