QWIT
Varenicline, bupropion, cytisine: how quit-smoking medications work
Nicotine patches and gum aren't the only medical tools for quitting, and they're not always the most effective. Three prescription-only medications — varenicline, bupropion, and cytisine — approach the problem differently, and reviews of the evidence consistently find they meaningfully improve quit rates compared to trying alone. None of them are something to start without a doctor. This is background for that conversation, not a replacement for it.
Varenicline: blocking the reward and easing withdrawal
Varenicline works directly on the nicotine receptors in the brain. It partially activates them, which blunts withdrawal symptoms, and it also blocks nicotine from binding fully, so a cigarette smoked while on varenicline delivers much less of a reward than usual — which is part of why some people find it easier to stay quit even after a slip. In clinical reviews it's consistently rated among the most effective single medications for quitting, generally outperforming nicotine replacement alone. Reported side effects include nausea, vivid dreams, and sleep changes; earlier safety concerns about mood and neuropsychiatric effects prompted years of additional monitoring, and current large trials have been reassuring, but it's exactly the kind of history worth discussing with a doctor who knows your full picture.
Bupropion: an antidepressant that also curbs cravings
Bupropion was originally developed as an antidepressant and was found, by observation, to also reduce nicotine cravings and withdrawal symptoms — it affects dopamine and noradrenaline pathways involved in both mood and addiction. It's a reasonable option for people who also have depression, though it isn't prescribed as a stop-smoking aid to everyone: it's contraindicated with certain conditions, including seizure disorders and some eating disorders, and it interacts with other medications. Common side effects include dry mouth, trouble sleeping, and, less commonly, mood changes worth flagging to a prescriber. Efficacy reviews place it above placebo and roughly in the range of nicotine replacement therapy on its own.
Cytisine: a plant-based option gaining traction
Cytisine comes from the seeds of the laburnum plant and has been used for decades in some Central and Eastern European countries, more recently gaining approval and interest more widely as trial data accumulated. It works similarly to varenicline — partially activating nicotine receptors — but over a shorter standard course and, in the studies available, at a notably lower cost. Recent head-to-head trials have found it performs comparably to varenicline and nicotine replacement therapy for quit success. Side effects are generally reported as mild, most often nausea or stomach upset, though availability still varies significantly by country.
None of these are do-it-yourself
Every one of these medications requires a prescription for good reason: they interact with other conditions and medications, need dosing that starts before the actual quit date in most protocols, and carry contraindications that aren't obvious from the outside. Effectiveness also climbs substantially when medication is combined with some form of behavioral support — a quit line, counseling, or a structured tracking tool. Apps like Qwit are designed to sit alongside whatever medical approach someone's doctor recommends, not instead of it.
What to bring to the conversation
Tell your doctor about your smoking history (how much, how long, past quit attempts), any mental health history, other medications and supplements you take, and any seizure history. That's usually enough for them to steer you toward the option — or combination — most likely to work for your situation, and to set a monitoring plan if needed.
Sources: Cochrane reviews on varenicline, bupropion, and cytisine for smoking cessation; WHO, tobacco treatment guidelines; NHS, stop smoking medicines guidance.