Not FDA approved for use in dogs and cats but it is a common and accepted practice to use clemastine in veterinary medicine. Available over the counter . Other antihistamines are more commonly used to treat cats. Histamine is released by body tissues during an allergic reaction. Symptoms include 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 determine which works the best at relieving the symptoms. Duration of treatment depends on reason for treatment and response to treatment. Side Effects Side effects include sedation and dry mouth. Not for use during pregnancy or lactation . Discontinue use at least 4 days prior to skin allergy testing.