What are the possible side effects of CHANTIX?

Serious side effects of CHANTIX may include:

• See "What is the most important information I should know about CHANTIX?"
• Seizures. Some people have had seizures during treatment with CHANTIX. In most cases, the seizures have happened during the first month of treatment with CHANTIX. If you have a seizure during treatment with CHANTIX, stop taking CHANTIX and contact your healthcare provider right away.
• New or worse heart or blood vessel (cardiovascular) problems, mostly in people, who already have cardiovascular problems. Tell your healthcare provider if you have any changes in symptoms during treatment with CHANTIX.
  Get emergency medical help right away if you have any of the following symptoms of a heart attack, including:
  • chest discomfort (uncomfortable pressure, squeezing, fullness or pain) that lasts more than a few minutes, or that goes away and comes back
  • pain or discomfort in one or both arms, back, neck, jaw or stomach
  • shortness of breath, sweating, nausea, vomiting, or feeling lightheaded associated with chest discomfort
• Sleepwalking can happen with CHANTIX, and can sometimes lead to behavior that is harmful to you or other people, or to property. Stop taking CHANTIX and tell your healthcare provider if you start sleepwalking.
• Allergic reactions can happen with CHANTIX. Some of these allergic reactions can be life-threatening.
• Serious skin reactions, including rash, swelling, redness, and peeling of the skin. Some of these skin reactions can become life-threatening.

Stop taking CHANTIX and get medical help right away if you have any of the following symptoms:

• swelling of the face, mouth (tongue, lips, and gums), throat or neck
• trouble breathing
• rash with peeling skin
• blisters in your mouth

The most common side effects of CHANTIX include:

• nausea
• sleep problems (trouble sleeping or vivid, unusual, or strange dreams)
• constipation
• gas
• vomiting

Tell your healthcare provider about side effects that bother you or that do not go away.

These are not all the side effects of CHANTIX. Ask your healthcare provider or pharmacist for more information.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.