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What Are the Common Reactions to Clemastine?

Possible Side Effects

Based on the limited information from prescription clemastine products, the most common side effects of antihistamines like clemastine include:
  • Drowsiness
  • Sedation (a feeling of sleepiness and reduced anxiety)
  • Dizziness
  • Indigestion or heartburn
  • Coordination problems
  • Thickening of bronchial secretions (chest mucus).
Other reported clemastine side effects (or side effects of other similar antihistamines) include:
  • Fatigue
  • Restlessness, excitation, nervousness, or irritability
  • Shakiness (tremor)
  • Insomnia
  • An unusual, pleasant feeling (euphoria)
  • Sensitivity to the sun
  • Excessive sweating and/or chills
  • Dry mouth, nose, or throat
  • Unusual sensations, such as tingling or numbness
  • A spinning sensation (vertigo)
  • Loss of appetite, nausea, or vomiting
  • Diarrhea or constipation
  • Nasal stuffiness
  • Early menstrual period.

Final Thoughts

You may experience some or none of the clemastine side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have side effects from a medicine that you have never tried. Therefore, make sure to let your healthcare provider know if you develop any side effects while taking the drug or if something "just does not seem right." While it may not be a side effect of clemastine, your healthcare provider will be able to diagnose and treat the problem.
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