repeat after me..."Google is my friend..."

http://www.nlm.nih.gov/medlineplus/d...l#side-effects
What side effects can this medication cause?
Although side effects from chlorpheniramine are not common, they can occur. Tell your doctor if any of these symptoms are severe or do not go away:

dry mouth, nose, and throat
upset stomach
headache
chest congestion
diarrhea
If you experience any of the following symptoms, call your doctor immediately:

vision problems
difficulty urinating
difficulty breathing
muscle weakness
prolonged drowsiness
excitement (especially in children)
dizziness
skin rash

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