What side effects may I notice from receiving Clemastine?

Side effects that you should report to your doctor or health care professional as soon as possible:
-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-changes in vision
-confused, agitated, nervous
-fast, irregular heartbeat
-low blood pressure
-seizures
-tremor
-trouble breathing
-trouble passing urine
-uncoordinated
-unusually weak or tired

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-constipation, diarrhea
-drowsy, tired
-dry mouth, nose, throat
-headache
-loss of appetite
-stomach upset, vomiting
-thick mucous
-unusual sweating

This list may not describe all possible side effects for Clemastine. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.