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Clemastine is a medication approved for treating respiratory allergies, allergic skin reactions, and the common cold. The antihistamine works to relieve symptoms of these conditions by blocking acetylcholine receptors and H1 receptors in the body. The medicine comes in tablet and syrup form and is available both by prescription and over the counter (depending on the particular product). Potential side effects include drowsiness, dizziness, and coordination problems.

What Is Clemastine?

Clemastine fumarate (Tavist® Allergy, Dayhist® Allergy) is an antihistamine medication used to treat the symptoms of respiratory allergies (such as hay fever), the common cold, or allergic reactions (such as hives). It is available without a prescription (1.34 mg clemastine fumarate tablets) or by prescription only (clemastine fumarate syrup and 2.68 mg tablets).
(Click What Is Clemastine Used For? for more information, including possible off-label uses.)

Potential Side Effects

As with any medicine, clemastine can cause side effects. However, not everyone who takes the drug will experience bothersome side effects. Some people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or can easily be treated by you or your healthcare provider. Serious side effects are less common.
Possible side effects of clemastine include, but are not limited to:
  • Drowsiness
  • Dizziness
  • Coordination problems
  • Indigestion or heartburn.
(Click Side Effects of Clemastine to learn more, including potentially serious side effects that you should report immediately to your healthcare provider.)
5 Tips to Keep a Cold at Bay

Clemastine Drug Information

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