What side effects may I notice from receiving Delsym?

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
-breathing problems
-confusion
-excitement, nervousness, restlessness, or irritability
-seizure
-slurred speech

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-headache
-stomach upset
-tiredness

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