Medications and Drugs
Brand Names: Chantix
Generic Name: varenicline (Pronunciation: ver EN e kleen)
What is varenicline (Chantix)?
Varenicline may also be used for purposes not listed in this medication guide.
Chantix 0.5 mg
oval, white, imprinted with Pfizer, CHX 0.5
Chantix 1 mg
oblong, blue, imprinted with Pfizer, CHX 1.0
What are the possible side effects of varenicline (Chantix)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using this medication and call your doctor at once if you have any mood or behavior changes, confusion, anxiety, panic attacks, hallucinations, extreme fear, or if you feel impulsive, agitated, aggressive, restless, hostile, depressed, hyperactive (mentally or physically), or have thoughts about suicide or hurting yourself.
Your family or other caregivers should also be alert to changes in your mood or behavior.
Call your doctor at once if you have any of these other serious side effects:
Less serious side effects may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is the most important information I should know about varenicline (Chantix)?
You may choose from 2 ways to use varenicline. Ask your doctor which of the following methods is best for you:
To improve your chances for successful smoking cessation, be sure to quit smoking on your planned quit date.
After you stop smoking, the doses of any medications you are using may need to be adjusted. Tell your doctor about all other medicines you use, especially insulin, blood thinners, or asthma medication.
Stop using this medication and call your doctor at once if you have: any mood or behavior changes, confusion, anxiety, panic attacks, hallucinations, extreme fear, or if you feel impulsive, agitated, aggressive, restless, hostile, depressed, hyperactive (mentally or physically), or have thoughts about suicide or hurting yourself.
Varenicline may impair your thinking or reactions. You may also have mood or behavior changes when you quit smoking. Until you know how varenicline and the smoking cessation process is going to affect you, be careful if you drive or do anything that requires you to be cautious and alert.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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Smoking Cessation Resources
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- Are You Ready to Quit Smoking?