Clemastine Fumarate Tablets Side Effects Center

Last updated on RxList: 1/31/2022
Clemastine Fumarate Tablets Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

What Is Clemastine Fumarate Tablets?

Clemastine fumarate is an antihistamine is used to relieve symptoms of nasal allergies, including sneezing, runny nose, itching, and watery eyes. Clemastine fumarate is available in generic and over-the-counter versions.

What Are Side Effects of Clemastine Fumarate Tablets?

Common side effects of clemastine fumarate include:

  • drowsiness,
  • dizziness,
  • headache,
  • constipation,
  • stomach upset,
  • blurred vision,
  • trouble walking/clumsiness, or
  • dry mouth/nose/throat may occur

These side effects of clemastine fumarate may decrease as your body adjusts to the medication.

Dosage for Clemastine Fumarate Tablets

The recommended starting dose is 1.34 mg (1/2 tablet) twice daily. Clemastine fumarate tablets are recommended for the dermatologic indications at the 2.68 mg dosage level only. The maximum recommended dosage is 2.68mg three times daily.

What Drugs, Substances, or Supplements Interact with Clemastine Fumarate Tablets?

Clemastine fumarate may interact with MAO inhibitors. Tell your doctor all medications and supplements you use.

Clemastine Fumarate Tablets During Pregnancy or Breastfeeding

During pregnancy, clemastine fumarate should be used only if recommended by your doctor. Consult your doctor before breastfeeding.

Additional Information

Our clemastine fumarate Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Allergies can best be described as: See Answer
Clemastine Fumarate Tablets Professional Information


Transient drowsiness, the most common adverse reaction associated with clemastine fumarate, occurs relatively frequently and may require discontinuation of therapy in some instances.

Antihistaminic Compounds: It should be noted that the following reactions have occurred with one or more antihistamines and, therefore, should be kept in mind when prescribing drugs belonging to this class, including clemastine fumarate.

The most frequent adverse reactions are underlined.

  1. General: Urticaria, drug rash, anaphylactic shock, photosensitivity, excessive perspiration, chills, dryness of mouth, nose, and throat.
  2. Cardiovascular System: Hypotension, headache, palpitations, tachy-cardia, extrasystoles.
  3. Hematologic System: Hemolytic anemia, thrombocytopenia, agranulocytosis.
  4. Nervous System: Sedation, sleepiness, dizziness, disturbed coordination, fatigue, confusion, restlessness, excitation, nervousness, tremor, irritability, insomnia, euphoria, paresthesias, blurred vision, diplopia, vertigo, tinnitus, acute labyrinthitis, hysteria, neuritis, convulsions.
  5. GI System: Epigastric distress, anorexia, nausea, vomiting, diarrhea, constipation.
  6. GU System: Urinary frequency, difficult urination, urinary retention, early menses.
  7. Respiratory System: Thickening of bronchial secretions, tightness of chest and wheezing, nasal stuffiness.

Read the entire FDA prescribing information for Clemastine Fumarate Tablets (Clemastine Fumarate Tablets)


Could I Be Allergic? Discover Your Allergy Triggers See Slideshow

© Clemastine Fumarate Tablets Patient Information is supplied by Cerner Multum, Inc. and Clemastine Fumarate Tablets Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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