Prescription Stop-Smoking Medicines Explained
Date: July 22, 2026
From: Stop Smoking Guru
Prescription medicines can roughly double or even triple your chances of quitting compared with willpower alone. They're not for everyone, and they must be prescribed and monitored by a doctor, but they're worth asking about.
This is general information to help you have a conversation with your doctor or pharmacist. Never buy prescription medicines from websites that don't require a prescription: you can't be sure what you're getting.
Varenicline
Varenicline (sold under brand names including Champix and Chantix, and as generic versions) works on the same brain receptors as nicotine. It partly stimulates them, easing cravings and withdrawal, and partly blocks them, so smoking is less satisfying. Clinical trial reviews have found it to be one of the most effective single treatments, more effective than bupropion or a single form of NRT.
- How it's taken: tablets, usually started one to two weeks before your quit date, for a 12-week course (sometimes longer).
- Common side effects: nausea (taking it with food and water helps), sleep problems and vivid dreams, headache.
- Safety: earlier concerns about mood changes were examined in a large international trial, which did not find a significant increase in serious psychiatric side effects compared with placebo. Your doctor will still want to know about any mental health history.
Bupropion (Zyban)
Bupropion was first developed as an antidepressant. As a stop-smoking aid, it is thought to reduce cravings and withdrawal by acting on brain chemicals such as dopamine and noradrenaline.
- How it's taken: tablets, started one to two weeks before quit day, usually for 7 to 9 weeks.
- Common side effects: dry mouth, trouble sleeping, headache.
- Who shouldn't take it: it carries a small risk of seizures and isn't suitable for people with epilepsy, eating disorders and some other conditions. A doctor will check.
Cytisine
Cytisine (also called cytisinicline) is a plant-derived compound that works in a similar way to varenicline. It has been used in Central and Eastern Europe for decades and is usually much cheaper. Studies suggest it helps people quit, with effects broadly comparable to some other treatments, and it has become available in more countries in recent years. Ask your doctor whether it's an option where you live.
Comparing the options
| Medicine | Start | Typical course | Main side effects |
|---|---|---|---|
| Varenicline | 1–2 weeks before quit day | 12 weeks | Nausea, vivid dreams |
| Bupropion | 1–2 weeks before quit day | 7–9 weeks | Dry mouth, insomnia; seizure risk |
| Cytisine | Varies by product | About 25 days to 12 weeks, depending on regimen | Nausea, sleep changes |
Combining treatments
Some doctors combine a prescription medicine with nicotine replacement, particularly for heavier smokers. That's a decision for your prescriber. Whatever you use, adding behavioural support makes it more likely to work; see ways to quit smoking compared.
Questions to ask your doctor
- Which medicine suits my health history and other medicines?
- How do I start it, and when should my quit date be?
- What side effects should I report straight away?
- Will any of my other medicines need adjusting once I stop smoking? (Smoking affects how some drugs are processed.)
- Is there a local stop-smoking service I can use alongside it?