What side effects may I notice from receiving Guanfacine?

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
-changes in vision
-chest pain or chest tightness
-confusion
-depressed mood
-irregular, fast or slow heartbeat
-redness, blistering, peeling or loosening of the skin, including inside the mouth
-signs and symptoms of low blood pressure like dizziness; feeling faint or lightheaded, falls; unusually weak or tired
-trouble sleeping
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-change in sex drive or performance
-constipation
-drowsiness
-dry mouth
-headache
-tiredness
-weakness

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