What side effects may I notice from receiving Unisom?

Side effects that you should report to your care team as soon as possible:
-Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat
-Sudden eye pain or change in vision such as blurry vision, seeing halos around lights, vision loss
-Trouble passing urine
Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
-Constipation
-Drowsiness the day after use
-Dry mouth
-Headache
-Upset stomach

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