Doxepin is given by mouth and is used off label to treat psychogenic dermatoses such as excessive grooming and psychogenic alopecia. Give as directed. The most common side effect is sleepiness. Do not use in pets that are allergic to it or other tricyclic antidepressants, in pets currently using an MAOI or flea/tick collar, or in pets undergoing skin allergy testing within two weeks. If a negative reaction occurs, please call your veterinary office.