A vet prescription is required for the medicine you have chosen for the treatment and prevention of flea infestations ctenocephalides spp kills adult fleas eggs and larvae use as part of a treatment strategy for flea allergy dermatitis may aid in the control of existing environmental flea infestations in areas to which the animal has access for the prevention of heartworm disease and the treatment of adult roundworms ear mites biting lice and adult intestinal hookworms pif you d