IngredAn adverse reaction to a product containing PYRIPROXYFEN and CYPHENOTHRIN! He was losing control of his hind quarters and was twitching non stop, pacing around my house and unable to sit still. BE CAREFUL When using flea/tick control products! They contain powerful insecticides that have been associated with THOUSANDS of complaints, and possibly with thousands of animal deaths due to adverse reactions to them!!! If your pet has such a reaction or starts behaving bizarrely, bathe him immediately with a mild shampoo and rinse your pet thoroughly!!!ingredients used by The Hartz Mountain Corp