Stop-smoking medicines: varenicline, bupropion, cytisine (2026 guide)

Quitting smoking is one of the best things you can do for your health, but it is also one of the hardest. To improve the odds of success, several stop-smoking medicines exist: varenicline, bupropion and cytisine. This article reviews, in a factual and cautious way, what the scientific evidence says. It is general information only: these treatments are a medical decision and should never be taken without professional advice.

Warning. Most of the medicines described here require a prescription. This article is in no way a substitute for a consultation: never self-medicate, do not change a treatment on your own, and speak to your doctor or pharmacist before taking any action. General information is not a prescription. In France, the Tabac Info Service (39 89) helpline offers free support and a link to professionals; elsewhere, contact your national quitline.

Why take a medicine to stop smoking?

Tobacco dependence is largely a dependence on nicotine, which acts on specific receptors in the brain. When you quit, the drop in nicotine triggers withdrawal: irritability, anxiety, an overwhelming urge to smoke. Stop-smoking medicines act precisely on these brain receptors to reduce cravings and ease withdrawal symptoms, which helps people get through the first weeks, often the hardest. They do not create motivation on their own: they are a support, to be used as part of a broader, medically supervised effort.

Varenicline (Champix)

Varenicline, sold under the name Champix, acts directly on the brain's nicotinic receptors. According to Cochrane reviews, it is among the most effective treatments: it is thought to roughly double to triple the chances of quitting for good compared with a placebo. It is usually taken over several weeks, starting before the quit date set with the doctor.

Like any medicine, varenicline can cause side effects: nausea (the most common), vivid or unusual dreams, insomnia and headaches. Past concerns focused on possible psychiatric effects (mood, dark thoughts). The large EAGLES trial, designed to assess this question, did not confirm a significant increase in psychiatric risk compared with a placebo. Caution and follow-up nonetheless remain advisable, especially for people with a relevant history.

Bupropion (Zyban)

Bupropion, known as Zyban, was originally an antidepressant that proved useful for stopping smoking. According to Cochrane data, it is thought to increase the chances of quitting by about 1.6 times compared with a placebo: a real effect, slightly lower than that of varenicline. It can be a worthwhile option depending on each person's profile.

Bupropion carries important contraindications, notably a history of epilepsy or seizures, as well as certain eating disorders. It can interact with other medicines. That is exactly why only a doctor can judge whether it suits your situation: it must never be taken without prior medical assessment.

Cytisine

Cytisine is a plant-derived alkaloid, long used in several Eastern European countries. Its advantage: a low cost. Recent clinical trials, including work published in leading journals such as the New England Journal of Medicine (notably the trials led by the Rauora team and others), suggest an effectiveness comparable to that of varenicline. In some countries it is available without a prescription, but that does not mean it is harmless: medical or pharmaceutical advice is strongly recommended before using it.

Benefits and drawbacks at a glance

To make things clearer, here is a summary of the main benefits of these treatments:

• An effectiveness among the best available for improving the chances of quitting for good.
• A stronger effect when combined with behavioural support.
• For cytisine, a moderate cost and, in some countries, easier access.
• A targeted action on cravings and withdrawal, particularly useful in the first weeks.

And here are the main drawbacks and limits to keep in mind:

• Possible side effects (nausea, sleep problems, vivid dreams, headaches and so on).
• Contraindications and interactions, notably for bupropion.
• The need for medical follow-up during treatment.
• Prescription-only access for most of these medicines.

Medicine plus support: a winning combination

Health authorities, including the World Health Organization (WHO) and France's Haute Autorité de santé (HAS), stress one key point: a medicine is far more effective when paired with behavioural support. Advice from a professional, regular follow-up, telephone helplines or coaching apps: this support helps manage risky situations, anticipate relapses and stay motivated. The medicine acts on the physical craving; the support acts on habits and environment. It is the combination of the two that produces the best results.

In practice, the first step is not the pharmacy but the doctor's office. A professional will assess your dependence, history and preferences to recommend the most suitable strategy. In France, Tabac Info Service (39 89) can guide you free of charge; in other countries, look for the national quitline.