What side effects may I notice from receiving Varenicline?

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, tongue, or throat
-acting aggressive, being angry or violent, or acting on dangerous impulses
-breathing problems
-changes in emotions or moods
-chest pain or chest tightness
-feeling faint or lightheaded, falls
-hallucination, loss of contact with reality
-mouth sores
-redness, blistering, peeling or loosening of the skin, including inside the mouth
-signs and symptoms of a stroke like changes in vision; confusion; trouble speaking or understanding; severe headaches; sudden numbness or weakness of the face, arm or leg; trouble walking; dizziness; loss of balance or coordination
-seizures
-sleepwalking
-suicidal thoughts or other mood changes

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

-constipation
-gas
-headache
-nausea, vomiting
-strange dreams
-trouble sleeping

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