Before using varenicline, tell your doctor if you have kidney disease, or a history of mental illness.
FDA pregnancy category C. This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.
It is not known whether varenicline passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.
Do not give this medicine to anyone younger than 18 years old.
Varenicline can cause drowsiness, which 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 are going to affect you, Be careful if you drive or do anything that requires you to be cautious and alert.
Seek emergency medical attention if you think you have used too much of this medicine. Symptoms of a varenicline overdose are unknown.
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose. Be sure to take the medicine after eating.
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, or if you feel agitated, depressed, or have thoughts about suicide or hurting yourself.
Your family or other caregivers should also be alert to changes in your mood or behavior.
Less serious side effects may include:
- nausea (may persist for several months);
- stomach pain, indigestion, vomiting, constipation, gas;
- weakness, tired feeling;
- increased appetite;
- unpleasant taste in your mouth;
- headache; or
- sleep problems (insomnia) or unusual dreams.
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.
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:
- a blood thinner such as warfarin (Coumadin); or
- theophylline (Respbid, Theobid, Theoclear, Theo-Dur, Uniphyl).
This list is not complete and there may be other drugs that can interact with or be affected by varenicline. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.
Chantix, varenicline, and Chantix Starter Pack
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Copyright 1996-2004 Cerner Multum, Inc. Version 2.05. Revision date 8/23/04