CHANTIX® What are the possible side effects of CHANTIX?

(varenicline tartrate)

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.

Find CHANTIX® medical information:

Find CHANTIX® medical information:

Our scientific content is evidence-based, scientifically balanced and non-promotional. It undergoes rigorous internal medical review and is updated regularly to reflect new information.

CHANTIX® Quick Finder

Medication Guide

Health Professional Information

What are the possible side effects of CHANTIX?

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.

Prescribing Information
Download Prescribing Information

Health Professional Information

What are the possible side effects of CHANTIX?

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.

Resources

Didn’t find what you were looking for? Contact us.

MI Digital Assistant

Chat online with Pfizer Medical Information regarding your inquiry on a Pfizer medicine.

Call 800-438-1985*

*Contact Medical Information.9AM-5PM ET Monday to Friday; excluding holidays.

Report Adverse Event

Pfizer Safety

To report an adverse event related to the Pfizer-BioNTech COVID-19 Vaccine, and you are not part of a clinical trial* for this product, click the link below to submit your information:

Pfizer Safety Reporting Site

*If you are involved in a clinical trial for this product, adverse events should be reported to your coordinating study site.

If you cannot use the above website, or would like to report an adverse event related to a different Pfizer product, please call Pfizer Safety at (800) 438-1985.

FDA Medwatch

You may also contact the U.S. Food and Drug Administration (FDA) directly to report adverse events or product quality concerns either online at www.fda.gov/medwatch or call (800) 822-7967.