Chantix / Teva-Varenicline / Apo-Varenicline (generic name: varenicline) are
smoking cessation medications that help adults who want to stop smoking.
Varenicline works by binding to
nicotinic acetylcholine receptors in the brain, acting as a
partial agonist, which reduces
nicotine cravings and eases
withdrawal symptoms. It also blocks nicotine from activating those receptors, making any smoking less satisfying. Varenicline belongs to the pharmacological class of
nicotinic receptor partial agonists.
Dosage
Follow the prescribing doctor’s dosage instructions which are printed on the label of the box. Check with a doctor or pharmacist if there are any doubts regarding the proper dosage and treatment regimen.
A person should choose a quit-smoking date and start Chantix one week before that date. The usual regime is as follows:
- Days 1–3: take 0.5 mg once daily (white tablet).
- Days 4–7: take 0.5 mg twice daily, morning and evening.
- Day 8 to end of treatment (usually 12 weeks): take 1 mg twice daily, morning and evening.
- If smoking has stopped after 12 weeks, an additional 12 weeks of 1 mg twice daily may be offered.
- Tablets should be swallowed whole with water, with or without food.
If a dose is missed, it should be taken as soon as remembered. If it is close to the next scheduled dose, the missed dose should be skipped. Do not take two doses at once.
Storage
- Store Chantix at room temperature, not above 25 °C (~77 °F).
- After opening a bottle, the shelf life is 28 days.
- Keep tablets in the original packaging, protected from moisture and heat.
- For more general information, read our article on drug storage.
This text is for informational purposes only. Please consult a doctor or pharmacist before using any medication.
The information leaflet that comes with the medication includes full information about the possible side effects. Be sure to read and understand these, and if there are any questions, discuss these with a healthcare provider or pharmacist before starting treatment.
Caution
Pregnant women should not be using Chantix unless this has been discussed with a healthcare provider, as it might harm the unborn baby or pose a risk of miscarriage. For this reason, women planning to become pregnant should use appropriate birth control measures during the treatment and one month after taking the last dose of Chantix. Chantix may pass into breast milk, and mothers should consult with a doctor if already feeding or planning to feed an infant.
Most people who use Chantix do not experience any adverse side effects. Doctors prescribe this medication because they assess the benefits of such treatment outweigh any likely unwanted effects.
Some of the side effects that have been reported include:
- Nausea
- Abnormal or vivid dreams
- Trouble sleeping (insomnia)
- Headache
- Constipation and flatulence
Not all side effects are listed here. If these or other unlisted symptoms persist or worsen, consult a healthcare provider or pharmacist.
Chantix is approved for smoking cessation in adults, helping to stop tobacco use. It relieves symptoms of nicotine withdrawal such as cravings, irritability, anxiety, restlessness, difficulty concentrating, and increased appetite. A person may also experience reduced satisfaction if smoking occurs during treatment.
The focus is solely on adult smokers motivated to quit, typically as part of a smoking‑cessation program including counseling and behavioral support.