acamprosate vs varenicline
Side-by-side comparison of acamprosate and varenicline Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Campral
Chantix
Acamprosate is a medicine that can help you stay away from alcohol if you are alcohol-dependent and have already stopped drinking. It should be used with counseling and support.
Varenicline (Chantix) is a medicine that can help you stop smoking. It works on receptors in the brain to reduce cravings and withdrawal symptoms.
Acamprosate helps people who are alcohol-dependent to not drink alcohol. You must have already stopped drinking before you start taking acamprosate. This medicine works best when it is part of a complete treatment plan that includes counseling and support.
Varenicline is used to help adults stop smoking. It reduces your urge to smoke. It also helps manage withdrawal symptoms you may have when you quit.
Acamprosate is similar to a natural substance in your brain. It is thought to work by helping to restore the normal balance of brain activity that is changed by long-term alcohol use. This can reduce your craving for alcohol.
Varenicline works by attaching to certain receptors in your brain. These receptors are called nicotinic receptors. By attaching to them, varenicline reduces cravings and withdrawal symptoms linked to nicotine addiction.
- • Accidental injury
- • Weakness
- • Pain
- • Loss of appetite
- • Diarrhea
- • Feeling sick to your stomach
- • Strange or vivid dreams
- • Constipation
- • Gas
- • Throwing up
- Low blood pressure 14
- Weakness 13
- Condition worsened 13
- Using the medicine for something it is not approved for 13
- Sudden kidney damage 12
- Sneezing 732
- Feeling sick to your stomach 559
- Medicine not working 457
- Throwing up 381
- Feeling sad or hopeless 349
Acamprosate may increase the risk of suicidal thoughts or actions. Your doctor should watch you for depression or suicidal thoughts. Tell your doctor right away if you have any new or worsening symptoms of depression or suicidal thoughts.
Varenicline can cause changes in your mood or behavior. These can include depression, anxiety, aggression, and suicidal thoughts. If you have these symptoms, stop taking varenicline and call your doctor right away. Varenicline may also increase your risk of seizures, accidental injuries, heart problems, sleepwalking, and severe allergic reactions.
Acamprosate may harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if acamprosate passes into breast milk. Talk to your doctor if you are breastfeeding.
Tell your doctor if you are pregnant or plan to become pregnant. Varenicline may affect your unborn baby. It is not known if varenicline passes into breast milk. Talk to your doctor about the best way to feed your baby if you take varenicline.
How to Read This acamprosate vs varenicline Comparison
acamprosate is classified in the GABA Analog (Alcohol Dependence) drug class, while varenicline sits within the Nicotinic Receptor Partial Agonist class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, acamprosate has 65 submissions while varenicline has 2,478. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between acamprosate and varenicline — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.