There are three FDA-approved medications specifically designed to help people stop drinking or drink less: disulfiram, naltrexone, and acamprosate. Each works differently, and the right choice depends on whether someone is trying to quit entirely, cut back, or manage cravings after getting sober. Beyond these three, doctors sometimes prescribe additional medications off-label, and a separate set of drugs is used during the initial detox period to keep withdrawal safe.
Disulfiram: The Deterrent Approach
Disulfiram, sold as Antabuse, has been around since 1948 and was the only option for decades. It works by blocking the enzyme your body uses to break down a toxic byproduct of alcohol. Normally, when you drink, your liver converts alcohol into a compound called acetaldehyde, then quickly breaks that down into harmless substances. Disulfiram stops that second step cold.
The result is that acetaldehyde builds up rapidly if you drink while taking the medication. Within minutes, you can experience intense nausea, skin flushing, dizziness, a racing heart, and a drop in blood pressure. The experience is unpleasant enough that the anticipation alone keeps many people from drinking. This is purely a deterrent. It does nothing to reduce cravings or fix the brain chemistry changes that drive alcohol dependence. It only works if you take it every day, and people who aren’t firmly committed to quitting often simply stop taking it.
Naltrexone: Reducing the Reward
Naltrexone takes a completely different approach. Instead of punishing you for drinking, it blocks the receptors in your brain responsible for the pleasurable buzz alcohol produces. Drinking while on naltrexone feels less rewarding, which over time can reduce cravings and make it easier to cut back or stop. The FDA approved the oral version in 1994 and an extended-release monthly injection (Vivitrol) in 2006.
The oral pill is taken daily, and that daily commitment is where some people struggle. The injectable version is given once a month as a shot in the muscle, removing the need to remember a pill every day. This can be especially helpful for people with unstable housing or chaotic schedules. The trade-off is cost: the injection runs roughly $1,200 per month at retail compared to about $100 per month for the pills, though insurance often covers both.
Research on oral naltrexone shows a small to moderate effect on reducing heavy drinking, with one analysis finding it prevented a return to heavy drinking in about 1 in 12 people treated. The injectable form showed a more modest but more consistent effect across studies. One important consideration: naltrexone is processed by the liver, so doctors use caution in people with serious liver disease, which is common among heavy drinkers.
Acamprosate: Calming the Brain After Quitting
Acamprosate, approved in 2004, is designed for people who have already stopped drinking and want to stay sober. Chronic heavy drinking reshapes your brain’s signaling systems. Alcohol suppresses excitatory brain activity over time, so when you quit, those systems rebound hard, leaving you in a state of heightened anxiety, restlessness, and irritability. Acamprosate dials down that overexcitement by dampening excitatory signaling and boosting the brain’s natural calming pathways.
Unlike naltrexone, acamprosate is processed by the kidneys rather than the liver. That makes it a good option for people whose liver function is already compromised from years of heavy drinking. However, it’s not suitable for people with significant kidney disease. It’s taken as a pill three times a day, which can be a hurdle for some people.
Off-Label Medications
Two anti-seizure medications, topiramate and gabapentin, are increasingly prescribed off-label for alcohol use disorder. Neither has formal FDA approval for this purpose, but both have shown promise in clinical trials.
Topiramate has demonstrated a moderate overall effect on promoting abstinence across multiple studies. In head-to-head comparisons with naltrexone, topiramate performed at least as well on measures of alcohol intake, cravings, and quality of life, though the studies were too small to declare a clear winner. Gabapentin appears to reduce heavy drinking days, with some evidence that higher doses work better than lower ones. One meta-analysis found gabapentin increased the likelihood of total abstinence by about 66% compared to placebo, though other analyses were less optimistic. Gabapentin has the added benefit of being adjustable for people with kidney problems.
Baclofen, a muscle relaxant, is another off-label option that some doctors use, particularly in Europe. It requires caution in people with kidney impairment or those taking other sedating medications.
Medications Used During Detox
The medications above are for long-term recovery. The first few days of quitting, when withdrawal symptoms peak, require a different set of tools entirely. Alcohol withdrawal can cause tremors, anxiety, seizures, and in severe cases a dangerous condition called delirium tremens. This is a medical emergency, not something to manage at home.
Benzodiazepines are the standard treatment during acute withdrawal. They work on the same calming brain pathways that alcohol itself targets, essentially substituting a controlled, measurable dose of sedation while the brain readjusts. Lorazepam is often preferred because it’s less dependent on liver function, an important consideration since many people going through alcohol detox have some degree of liver damage. Most alcohol withdrawal seizures stop on their own, but benzodiazepines can terminate prolonged seizures quickly.
In some cases, doctors add phenobarbital alongside the benzodiazepine on the first day. One study found that this combination more than quadrupled the chances of being discharged within three days compared to using the benzodiazepine alone. These medications are used only during the acute withdrawal period, typically lasting a few days, and are not part of ongoing treatment.
How These Medications Fit Together
No single medication works for everyone, and none of them is a standalone cure. They’re most effective when combined with some form of counseling or behavioral support. In practice, the choice often comes down to practical factors. Someone who wants to quit completely and needs external accountability might start with disulfiram. Someone who wants to gradually reduce their drinking, or who finds that cravings are their biggest obstacle, is often a better fit for naltrexone. Someone who has already detoxed and is struggling with the anxiety and restlessness of early sobriety may benefit most from acamprosate.
Liver and kidney health narrows the options further. A person with liver damage but healthy kidneys is generally steered toward acamprosate. Someone with kidney problems but a functioning liver might do better with naltrexone. The off-label options provide additional flexibility when the FDA-approved medications aren’t a good fit or haven’t worked. Many people try more than one medication before finding what helps, and combining medications is sometimes an option as well.