Brand-name Chantix is no longer available. Pfizer recalled the product in 2021 after testing revealed unacceptable levels of a cancer-linked impurity called N-nitroso-varenicline. However, the active ingredient, varenicline, is still on the market as a generic medication from several manufacturers. If you’re looking to use this drug to quit smoking, you can still get it with a prescription.
Why Chantix Was Pulled From the Market
Pfizer’s patent on Chantix expired in May 2020, and the following year brought the recall that ended the brand for good. Testing found that Chantix tablets contained between 150 and 470 nanograms of N-nitroso-varenicline per 1-mg tablet. That’s a nitrosamine, a type of chemical impurity that can increase cancer risk with long-term exposure. The FDA’s acceptable daily intake limit for this impurity is 37 nanograms per day, so the levels found in Chantix were many times over that threshold.
Rather than reformulate and relaunch the brand, Pfizer discontinued Chantix. The FDA then worked to ensure generic manufacturers could fill the gap with products meeting the 37-nanogram safety limit. During the transition, the agency temporarily allowed products with levels up to 185 nanograms per day while manufacturers optimized their processes. FDA scientists determined that even at that interim level, the additional cancer risk was minimal. As of now, any newly manufactured varenicline for the U.S. market must meet the stricter 37-nanogram standard, and the FDA has expressed confidence that current manufacturers can reliably hit that target.
Generic Varenicline Is Available
Varenicline is now sold only as a generic. Multiple manufacturers have FDA approval to produce it, including Apotex, Aurobindo Pharma, Ajanta Pharma, and Alkem Laboratories. Your pharmacy will dispense whichever generic version they stock, and all approved versions are therapeutically equivalent to the original Chantix.
Cost varies significantly depending on your insurance. The retail price for a typical 60-tablet supply (one month at the full dose) can be listed around $527, but discount programs and coupons can bring the out-of-pocket cost down to roughly $34. Most insurance plans and many state Medicaid programs cover smoking cessation medications, so it’s worth checking your formulary before assuming you’ll pay full price.
How Varenicline Works
Varenicline targets the same receptors in the brain that nicotine binds to. It partially activates those receptors, which delivers a mild dopamine release that takes the edge off cravings and withdrawal. At the same time, it blocks nicotine from attaching to those receptors, so if you do smoke while taking the medication, the cigarette feels less rewarding. This dual action is what makes varenicline more effective than most other quit-smoking options.
A large study of over 220,000 patients in primary care found that 28.8% of people prescribed varenicline had quit smoking at two years, compared to 24.3% of those using nicotine replacement therapy like patches or gum. A network meta-analysis of clinical trials confirmed that varenicline is the most effective single medication for smoking cessation at up to 12 months, with roughly 60% better odds of quitting compared to nicotine replacement alone.
What Taking It Looks Like
The standard course is 12 weeks. You start with a gradual ramp-up during the first week: one 0.5-mg tablet once daily for days one through three, then 0.5 mg twice daily for days four through seven. Starting on day eight, you move to the full dose of 1 mg twice daily for the remainder of the 12 weeks. Most prescribers recommend picking a quit date during the second week of treatment, once the medication has built up in your system.
The most common side effects are nausea (especially early on), headaches, difficulty sleeping, vivid dreams, dizziness, and a bad taste in your mouth. Nausea tends to improve after the first couple of weeks, and taking the tablet with food and a full glass of water helps. Some people also report acid reflux, diarrhea, or a sore throat.
There are more serious effects to watch for, though they’re less common. Some people experience mood changes, increased irritability, anxiety, or depression. In rare cases, people have reported suicidal thoughts. The FDA previously had a boxed warning about psychiatric side effects on Chantix, though it was later removed after a large safety trial found no significant increase in serious psychiatric events compared to nicotine patches or placebo, even among people with existing mental health conditions. Still, if you notice significant mood changes, that’s something to raise with your prescriber promptly.
Availability Outside the U.S.
The same drug is sold as Champix in Europe, the UK, Canada, and other international markets. The European Medicines Agency still lists Champix as authorized, though supply shortages have been an ongoing issue in several countries since the original recall disrupted global production. If you’re outside the U.S. and having trouble finding it, generic versions of varenicline are increasingly available through international pharmacies as more manufacturers come online.