Benefits: Clemestine antihistamine helps relieve itching caused by allergies; Clemestine treats itching caused by atopy Clemestine has less of a sedative effect than other antihistamines Cautions:Use with caution when given with sedatives or tranquilizers.Use with caution in animals with prostate or bladder conditions, sever cardiac failure or glaucoma.Use with caution when given to pregnant or nursing animals.Do not use in animals that are allergic to it.Possible Side Effects:Side effects of Clemastine vary with cats and dogs. In dogs it's most commonly sedation, hyperactivity, and dry mouth. In cats, diarrhea is most common. The side effects of clemastine in dogs are sedation, paradoxical hyperactivity, and dryness of the mouth. Clemastine Fumarate Antihistamine 2.68mg 100 Count Bottle. I do not receive this product or any others in exchange for this article, I do get a commission for readers clicking the buy now links which helps to differ the cost of hosting this blog and I sincerely hope this article site helps you with your search for Vet Approved Rx products.