Three medications are approved by the FDA specifically to help people stop or reduce drinking: naltrexone, acamprosate, and disulfiram. Each works through a different mechanism, and the best choice depends on whether your goal is complete abstinence or cutting back on heavy drinking. A couple of additional medications are also prescribed off-label with promising results.
Naltrexone: Reducing the Urge to Drink
Naltrexone works by blocking the receptors in your brain that produce the pleasurable, rewarding feeling you get from alcohol. When those receptors are blocked, drinking simply doesn’t feel as good. Over time, this weakens the learned connection between alcohol and reward, which reduces cravings and makes it easier to drink less or stop entirely.
Naltrexone is available as a daily pill (sold as Revia) or a once-monthly injection (Vivitrol), which was approved in 2006 for people who prefer not to take a pill every day. In clinical trials, naltrexone’s “number needed to treat” for preventing heavy drinking was 12, meaning that for every 12 people treated, one additional person avoided heavy drinking who wouldn’t have on placebo. That’s a meaningful effect size for a psychiatric medication.
One approach called the Sinclair Method uses naltrexone in a targeted way: you take the pill about an hour before drinking rather than every day. The idea is that by consistently blocking the reward signal each time you drink, the brain gradually loses its drive to seek alcohol over a period of several months. Some people using this method report that their desire to drink fades almost entirely.
Naltrexone doesn’t make you sick if you drink. You can start it whether you’re currently drinking or not, which makes it a practical first step for many people.
Acamprosate: Calming the Brain After Quitting
Acamprosate (sold as Campral) takes a completely different approach. After months or years of heavy drinking, your brain adapts to the constant presence of alcohol. When you stop, the brain becomes overexcited, which can cause anxiety, restlessness, insomnia, and a general sense of discomfort that drives many people back to drinking.
Acamprosate helps restore the balance between excitatory and inhibitory signaling in the brain. It calms that hyperexcitability, easing the lingering discomfort that persists well beyond the acute withdrawal phase. This makes it primarily a tool for maintaining abstinence rather than reducing drinking. You need to have already stopped drinking before starting it.
A large meta-analysis covering 24 clinical trials and nearly 7,000 patients found that acamprosate increased the total time people stayed abstinent by 11% and reduced the risk of returning to any drinking by 14% compared to placebo. Its number needed to treat for preventing a return to any drinking was 12, slightly better than naltrexone’s NNT of 20 for that same outcome. However, naltrexone tends to perform better at preventing heavy drinking specifically, so the two medications complement each other depending on your goals.
Disulfiram: The Deterrent Approach
Disulfiram (sold as Antabuse) was the first medication approved for alcohol problems and has been around for over 40 years. It doesn’t reduce cravings or fix brain chemistry. Instead, it acts as a powerful deterrent. Disulfiram blocks your body’s ability to break down a toxic byproduct of alcohol called acetaldehyde. Normally, your liver processes this substance quickly. On disulfiram, it accumulates.
If you drink while taking disulfiram, you’ll experience a reaction that can include flushing, nausea and vomiting, a pounding headache, rapid heartbeat, dizziness, chest pain, and difficulty breathing. These symptoms last as long as alcohol remains in your system, anywhere from 30 minutes to several hours. In rare cases involving large amounts of alcohol, the reaction can be severe enough to cause seizures or cardiac events.
The effectiveness of disulfiram depends almost entirely on motivation. It works best for people who are already committed to quitting and want an extra layer of accountability. Knowing how unpleasant the reaction will be can be enough to keep you from reaching for a drink. But if you simply stop taking the pill, the deterrent disappears within a couple of weeks.
Off-Label Options: Gabapentin and Topiramate
Two medications developed for other conditions have shown real promise for alcohol problems, though neither has formal FDA approval for this use.
Gabapentin, originally a seizure and nerve pain medication, helps with both cravings and the anxiety and sleep problems that often accompany early sobriety. In one 12-week trial, higher doses produced an abstinence rate of 17% compared to just 4% on placebo. Another study found that only 3 out of 10 people on gabapentin relapsed at six weeks, versus 9 out of 11 on placebo. Gabapentin also performed well when combined with naltrexone, extending the time before heavy drinking resumed. It may be a particularly good option if anxiety or insomnia is a major trigger for your drinking.
Topiramate, another seizure medication, has also shown benefits in reducing heavy drinking days and cravings, though it carries a higher risk of cognitive side effects like difficulty concentrating or finding words.
How These Medications Compare
The right medication depends on where you are in the process and what you’re trying to achieve:
- Still drinking and want to cut back: Naltrexone can be started immediately and helps reduce heavy drinking even if you haven’t quit yet.
- Already quit and want to stay sober: Acamprosate is designed specifically for maintaining abstinence by easing the brain discomfort that follows prolonged drinking.
- Committed to quitting and want a hard line: Disulfiram provides a concrete physical consequence that reinforces your decision not to drink.
- Struggling with anxiety or sleep issues: Gabapentin addresses both cravings and the mood symptoms that often fuel relapse.
These medications can also be combined. Some treatment plans pair naltrexone with gabapentin during the early months, then continue naltrexone alone. None of these medications are meant to work in isolation. They’re most effective alongside some form of counseling or support, whether that’s therapy, a recovery group, or regular check-ins with a provider.
How Long Treatment Typically Lasts
There’s no single agreed-upon duration, but guidelines from SAMHSA suggest continuing medication for at least 6 months to a year. Research shows improved outcomes when naltrexone treatment extends beyond 3 months, and since a significant proportion of relapses happen in the first year, many clinicians recommend staying on medication for at least 12 months. After that, the decision to continue or taper is usually based on how stable things feel, your history with relapse, and how well you’re tolerating the medication.
The most important thing to understand is that these medications are not a last resort or a sign of failure. They’re tools that change the brain chemistry driving the problem, giving you a better chance of making the behavioral changes that stick. Fewer than 10% of people with alcohol use disorder currently receive any medication for it, largely because many people don’t know these options exist.