Varenicline vs Cytisinicline: Which Stop Smoking Tablet Is Right for You?
How varenicline (including the Champix brand) and cytisinicline compare on course length, effectiveness, side effects and suitability.
Part of the Access Doctor Stop Smoking Guide.
Key fact: NICE found no difference in how well varenicline and cytisinicline help people stop smoking, although the direct comparisons are limited. The biggest practical difference is the course: 12 weeks for varenicline, 25 days for cytisinicline.
There are two prescription tablets in this comparison, not three. Champix is a brand of varenicline, made by Pfizer; generic varenicline is the same medicine under its own name. Cytisinicline (also called cytisine) is a different medicine that works in a similar way. NICE recommends both, combined with behavioural support.
12 wks
Varenicline course (can be extended to 24)
25 days
Cytisinicline course: one pack of 100 tablets
18–65
Cytisinicline age range (varenicline: 18+)
Not Sure Which to Choose?
Our pharmacist independent prescribers review your health and smoking history and recommend the stop smoking tablet that's right for you.
Start Stop Smoking Consultation →Side-by-Side Comparison
| Varenicline / Champix | Cytisinicline | |
|---|---|---|
| Course length | 12 weeks; a further 12 weeks can help you stay stopped | 25 days |
| Dosing | 0.5mg once a day for 3 days, then 0.5mg twice a day for 4 days, then 1mg twice a day | 1 tablet every 2 hours (up to 6 a day) for 3 days, then reducing step by step to 1–2 a day |
| Quit date | Usually between day 8 and day 14 | Within the first 5 days |
| Age | 18 and over | 18 to 65 (NICE: not for 66 and over) |
| Kidney disease | Lower dose in severe kidney disease | Not recommended |
| Side effects reported most often | Feeling sick, headache, trouble sleeping, vivid dreams | Increased appetite, dry mouth, sleep problems, headache, raised heart rate |
| Hormonal contraception | No known effect | Add a barrier method such as condoms |
| Price at Access Doctor | Varenicline starter pack £30.99 | Full course £99.99 |
12 weeks or 25 days? Cytisinicline gets the whole course done in under a month, but you take tablets up to 6 times a day at first and must stop smoking within 5 days. Varenicline is twice a day and gives you longer to prepare, but you take it for 3 months.
How Do They Work?
Both medicines are nicotinic receptor partial agonists. They attach to the same receptors in the brain that nicotine uses. By stimulating them gently, they ease cravings and withdrawal symptoms. By occupying them, they stop nicotine from attaching, so a cigarette gives you much less of a “hit” if you do smoke.
Cytisinicline comes from a plant compound that has been used in Central and Eastern Europe since the 1960s. Varenicline was developed from it and has been used in the UK since 2006. Cytisinicline 1.5mg tablets became available in the UK in 2024.
Which Works Better?
The honest answer is that there's no clear winner. The evidence:
- Varenicline more than doubles your chances of stopping compared with no medicine. This is based on 41 studies and is high-certainty evidence (Cochrane 2023).
- Cytisinicline works better than no medicine and better than nicotine replacement, according to NICE's 2025 review.
- Head to head, NICE found no difference in effectiveness between the two. Only 2 trials have compared them directly, so the evidence is limited and could change as more studies report.
The best treatment for you is the one you can take as prescribed for the whole course.
Side Effects Compared
Both medicines are generally well tolerated, and most side effects are mild and settle within the first couple of weeks. In NICE's review, people taking varenicline were more likely to feel sick than people taking cytisinicline, but the difference was small. How you react to either medicine is individual, so the list below is a guide rather than a prediction.
Varenicline
Feeling sick is the most commonly reported side effect, usually mild. Taking it after food with a full glass of water helps. Vivid dreams and trouble sleeping are also common.
Cytisinicline
Increased appetite, dry mouth, stomach upset, sleep problems and a faster heart rate are reported most often. Smoking during treatment can make side effects worse.
Some of these, such as poor sleep, headache and increased appetite, are also symptoms of nicotine withdrawal. Read more in our guide to varenicline and Champix side effects.
Which One Suits You?
Varenicline may suit you better if you:
- are 66 or over: NICE says cytisinicline shouldn't be offered at this age
- have kidney disease: the varenicline dose can be adjusted, while cytisinicline isn't recommended
- want more time before your quit date, or want to cut down gradually over 12 weeks
- prefer tablets twice a day rather than every few hours
- use the pill, patch or another hormonal contraceptive and don't want to add condoms
- have tried cytisinicline before and it didn't work
Cytisinicline may suit you better if you:
- want a shorter course: 25 days rather than 12 weeks
- felt sick on varenicline before, or are worried about nausea
- are ready to stop smoking within the first 5 days
- would rather buy one pack that covers the whole course
Neither is suitable if you're pregnant or breastfeeding, or under 18. Cytisinicline also isn't suitable if you have unstable angina, have had a recent heart attack or stroke, or have significant heart rhythm problems.
Champix vs Generic Varenicline
Champix was withdrawn in 2021 while a manufacturing impurity was investigated, and returned to UK pharmacies in 2025. Generic varenicline became available in late 2024. Both contain the same active medicine at the same doses and must meet the same MHRA quality standards, so they work in the same way. The tablets may look different, and the generic usually costs less.
Ready to start? Buy varenicline (from £30.99 for the starter pack), choose Champix tablets if you prefer the brand, or buy cytisinicline for the 25-day course. A prescriber checks your answers first.
Stop Smoking · Rx
Varenicline Tablets
The generic form of Champix: a 12-week course. Starter pack from £30.99.
View product →Stop Smoking · Rx
Champix (Varenicline)
The original brand of varenicline, back in the UK since 2025.
View product →Stop Smoking · Rx
Cytisinicline 1.5mg Tablets
A 25-day course in one pack of 100 tablets: £99.99.
View product →Get the Right Stop Smoking Tablet
Complete a short online consultation. A UK pharmacist prescriber will check whether varenicline, Champix or cytisinicline is safe and suitable for you.
Start Stop Smoking Consultation →Frequently Asked Questions
Is cytisinicline better than varenicline?
Not clearly. NICE found no difference in effectiveness between them, although only 2 trials have compared them directly. Cytisinicline has a shorter 25-day course, while varenicline is taken for 12 weeks and can be used by people aged 66 and over.
Is cytisinicline the same as cytisine?
Yes. Cytisinicline is the international name for cytisine, a plant-based compound. In the UK it's licensed as cytisinicline 1.5mg tablets.
Is generic varenicline as good as Champix?
Yes. Generic varenicline contains the same active medicine as Champix at the same doses, and it must meet the same MHRA standards. Only the tablet's appearance, packaging and price differ.
What are the alternatives to Champix in the UK?
Generic varenicline is the same medicine. Cytisinicline is a different tablet that works in a similar way. Combination nicotine replacement and nicotine vapes are non-prescription options that NICE also recommends.
Can I switch from varenicline to cytisinicline?
Yes, if varenicline didn't work or you couldn't tolerate it, a prescriber can consider cytisinicline instead. You shouldn't take both at the same time.
Does cytisinicline cause less nausea than varenicline?
In NICE's review, people taking varenicline were more likely to feel sick than those taking cytisinicline, but the difference was small. Cytisinicline more often causes increased appetite, dry mouth and sleep problems.
Can I use nicotine patches with varenicline or cytisinicline?
You can, but it isn't usually needed and may add to side effects such as nausea and headache with varenicline. Smoking or using nicotine during cytisinicline treatment can make its side effects worse, so ask your prescriber first.
References
- NICE. Tobacco: preventing uptake, promoting quitting and treating dependence (NG209). nice.org.uk
- Livingstone-Banks J, et al. Cochrane Database of Systematic Reviews. Nicotine receptor partial agonists for smoking cessation. 2023. cochranelibrary.com
- Electronic Medicines Compendium. Champix (varenicline) film-coated tablets: Summary of Product Characteristics. medicines.org.uk
- Electronic Medicines Compendium. Cytisinicline 1.5mg tablets: Summary of Product Characteristics. medicines.org.uk
- NICE CKS. Smoking cessation. cks.nice.org.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Prescription medicines require a consultation before they can be dispensed. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.