Medically reviewed on May 2, 2018
Uses of Chantix:
- It is used to help you stop smoking.
What do I need to tell my doctor BEFORE I take Chantix?
- If you have an allergy to varenicline or any other part of Chantix (varenicline).
- If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
This medicine may interact with other drugs or health problems.
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Chantix (varenicline) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
What are some things I need to know or do while I take Chantix?
- Tell all of your health care providers that you take Chantix (varenicline). This includes your doctors, nurses, pharmacists, and dentists.
- Avoid driving and doing other tasks or actions that call for you to be alert until you see how Chantix (varenicline) affects you.
- Accidents like car accidents have happened in people taking Chantix (varenicline). Talk with your doctor.
- Do not take Chantix (varenicline) for longer than you were told by your doctor.
- Talk with your doctor before you drink alcohol.
- When you stop smoking, other drugs may be affected. Talk with your doctor.
- Talk with your doctor if you have seizures or have ever had seizures.
- New or worse mental, mood, or behavior problems have happened with Chantix (varenicline). These problems include thoughts of suicide or killing someone else, depression, forceful actions, fury, anxiety, and anger. These problems have happened in people with and without a history of mental or mood problems. Watch people who take Chantix (varenicline) closely. If you think you have any of these problems, call your doctor right away. Call your doctor right away if you have any other signs like nervousness, restlessness, grouchiness, panic attacks, or any new or worse changes in mood or actions.
- You may have signs of nicotine withdrawal when you try to quit smoking even when using drugs like this one to help you quit smoking. There are many signs of nicotine withdrawal. Rarely depression and suicidal thoughts have happened in people trying to quit smoking. Talk with your doctor.
- Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using Chantix (varenicline) while you are pregnant.
- Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.
How is this medicine (Chantix) best taken?
Use Chantix (varenicline) as ordered by your doctor. Read all information given to you. Follow all instructions closely.
- Get counseling to help you quit smoking.
- Take after eating with a full glass of water.
- There are different ways that you can use Chantix (varenicline) to help you quit smoking. Talk with your doctor about when to start treatment with this drug and when to stop smoking.
What do I do if I miss a dose?
- Take a missed dose as soon as you think about it.
- If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
- Do not take 2 doses at the same time or extra doses.
See also: Dosage Information (in more detail)
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Shortness of breath.
- Feeling confused.
- Hallucinations (seeing or hearing things that are not there).
- Very upset stomach or throwing up.
- A very bad skin reaction (Stevens-Johnson syndrome/toxic epidermal necrolysis) may happen. It can cause very bad health problems that may not go away, and sometimes death. Get medical help right away if you have signs like red, swollen, blistered, or peeling skin (with or without fever); red or irritated eyes; or sores in your mouth, throat, nose, or eyes.
- Heart attack and stroke have rarely happened in people taking Chantix (varenicline). However, smoking may also raise the chance for these events. Call your doctor right away if you have signs of heart attack like chest pain that may spread to the arms, neck, jaw, back, or stomach; sweating that is not normal; or feeling sick or throwing up. Call your doctor right away if you have signs of stroke like change in strength on 1 side is greater than the other; eyesight, speech, or balance problems; change in thinking clearly and with logic; or very bad headache.
- Sleepwalking has happened with Chantix (varenicline). Sometimes, this can lead to harm to you or others. Call your doctor right away if you start to sleepwalk.
What are some other side effects of Chantix?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Upset stomach or throwing up.
- Strange or odd dreams.
- Not able to sleep.
- Hard stools (constipation).
- Dry mouth.
- Belly pain.
- Change in taste.
- Feeling tired or weak.
- Signs of a common cold.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.
See also: Side effects (in more detail)
If OVERDOSE is suspected:
If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
How do I store and/or throw out Chantix?
- Store at room temperature.
- Store in a dry place. Do not store in a bathroom.
- Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
- Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
Consumer information use
- If your symptoms or health problems do not get better or if they become worse, call your doctor.
- Do not share your drugs with others and do not take anyone else's drugs.
- Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
- Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
- This medicine comes with an extra patient fact sheet called a Medication Guide. Read it with care. Read it again each time Chantix (varenicline) is refilled. If you have any questions about Chantix (varenicline), please talk with the doctor, pharmacist, or other health care provider.
- If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
More about Chantix (varenicline)
- Chantix Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Drug Interactions
- Compare Alternatives
- Support Group
- Pricing & Coupons
- En Español
- 1020 Reviews – Add your own review/rating
- Drug class: smoking cessation agents
- Chantix (Advanced Reading)
- Chantix Start Month Pak (Advanced Reading)
- Chantix Starter Pack (Advanced Reading)