Varenicline is the single most effective monotherapy for stopping nicotine, according to the 2023 Cochrane network meta-analysis. It is FDA-approved for smoking cessation and used off-label for quitting vaping.
How it works
Varenicline is a partial agonist at the α4β2 nicotinic acetylcholine receptor — the same receptor nicotine binds to. It does two things at once:
- Partially activates the receptor, blunting withdrawal.
- Blocks nicotine from binding fully, so a slip is less rewarding.
The double action is why varenicline outperforms NRT (which only covers the first) and antidepressants (which only cover the second).
Standard dosing
- Days 1-3: 0.5 mg once daily
- Days 4-7: 0.5 mg twice daily
- Day 8 onward: 1 mg twice daily
- Quit date: usually day 8-14
Continue for at least 12 weeks. Extending to 24 weeks improves late relapse prevention in trials.
Side effects
- Vivid dreams (~one in five): usually settle after week two.
- Mild nausea (~one in three): take with food.
- Headache, constipation, gas: usually mild.
- Mood or behaviour changes: the FDA boxed warning was removed in 2016 after the EAGLES trial found no elevated psychiatric risk versus NRT.
Report new mood changes to a prescriber, but do not stop varenicline mid-quit without a plan; abrupt discontinuation raises relapse risk.
Contraindications
Serious kidney disease requires dose adjustment. Otherwise varenicline is well tolerated. It does not interact with common medications.
Who it suits
- People trying to quit for the first time
- People who have relapsed on NRT alone
- Heavy disposable vape users
Less ideal if you have unstable mental health that has not been reviewed by a clinician.
Cost and access
Generic varenicline (since 2021) costs ~$50-100/month out of pocket in the US; most insurance plans cover it at no copay. Free through NHS Stop Smoking Services in the UK. Requires a prescription in all markets.
See getting a prescription to quit vaping for how to open the conversation with a clinician.
