Use caution driving or operating machinery until you know how Chantix may affect you. Some people who use Chantix may feel sleepy, dizzy, or have trouble concentrating, that can make it hard to drive or perform other activities safely.

Do not take Chantix if you have had a serious allergic or skin reaction to Chantix, which may include:

• Swelling of the face, mouth, and throat that can cause trouble breathing.
• Rash
• Redness
• Peeling of the skin