Generic Name Diphenhydramine Brand Name Benadryl, Histacalm Type of Drug Antihistamine, antiemetic , antitussive , sedative Form and Storage Liquid elixir, capsule, tablet, and injectable Store at room temperature in a tightly closed container. General Information FDA approved only for external use in dogs and cats but it is a common and accepted practice to use diphenhydramine in the oral and injectable forms. Available over the counter and by prescription. Histamine is released by body tissues during an allergic reaction. Symptoms are itching, sneezing, and swelling especially of the face.
Anaphylactic shock is a severe and possibly fatal allergic reaction.
One type of antihistamine may work better than another in some pets so trial periods of 1-2 weeks may be needed using different antihistamines to see which works the best at relieving the symptoms. Duration of treatment depends on reason for treatment and response to treatment. Contents of slow-release capsules should not be allowed to dissolve on food before ingestion. Vomiting, diarrhea, and lack of appetite are less commonly seen. Sedative effects may decrease over time.