Clemastine is an antihistamine available in over-the-counter (OTC) medicines that temporarily reduce symptoms due to the common cold, hay fever, or other respiratory allergies. It may be written as clemastine or clemastine fumigate, but it is the same active ingredient. Clemastine can be found in allergy medicines.
Clemastine is approved by the U.S. Food and Drug Administration (FDA) and is safe and effective when used according to the Drug Facts label directions. Clemastine-containing medicines may cause drowsiness. Speak to a healthcare provider before using an allergy medicine containing clemastine if you are currently taking sedatives or tranquilizers.