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Are there any side effects of clemastine?

Yes, when using clemastine to treat your symptoms, there can be some side effects. If you have side effects that do not go away, stop the medicine and call your doctor. Common side effects include drowsiness, dizziness and dry mouth. Other side effects, such as dry throat and nose, jitteriness and changes in mucus thickness, can also develop. Depending on your age, current health, medical history and use of other medications, severe clemastine side effects can also develop. Severe side effects include the following:

  • convulsions
  • irregular heartbeat
  • lack of alertness
  • tremors
  • wheezing
  • hallucinations

These can be a medical emergency. Call your doctor or 911 right away. An allergic reaction to clemastine is also possible. Symptoms of allergic reaction include hives, itching and rash. Call your doctor immediately if these occur. If severe or allergic reaction symptoms develop, like difficulty breathing, tightness in the chest and swelling of the mouth, face, lips or tongue, this is a medical emergency. Call 911.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.