Fewer than 10% of people who could benefit from medication for alcohol use disorder ever receive it — and naltrexone for alcohol is one of the most effective and most underused of those options. It's a medication that blunts the reward and craving associated with drinking by blocking opioid receptors, which are part of how alcohol produces its pleasurable effects. Unlike some older approaches, naltrexone doesn't make you sick if you drink, and you don't have to be abstinent to start it. There's even an approach called the Sinclair Method that uses naltrexone in a specific way to gradually reduce drinking over time.
This guide explains how naltrexone works for alcohol, the Sinclair Method, oral versus injectable forms, the evidence, and what to expect. Updated April 2026. Reviewed by the RehabPulse editorial team. This is educational and not medical advice.
The 60-second answer
| Question | Short answer |
|---|---|
| What is naltrexone? | A medication that reduces alcohol craving and reward |
| How does it work? | Blocks opioid receptors involved in alcohol's pleasure |
| Does it make you sick if you drink? | No — that's disulfiram (Antabuse), a different drug |
| Do I have to be sober to start? | No — you can start while still drinking |
| What's the Sinclair Method? | Taking naltrexone before drinking to "unlearn" the habit |
| Forms? | Daily pill or a monthly injection (Vivitrol) |
| Is it effective? | Yes — evidence-based, FDA-approved for alcohol use disorder |
| Why so underused? | Lack of awareness among patients and prescribers |
The single most important point: most people don't know that an effective, FDA-approved medication for alcohol use disorder exists — and that it doesn't require you to quit first or punish you for drinking. Many people still think the only options are willpower, meetings, or a drug that makes you violently ill if you drink. Naltrexone works differently: it quietly turns down the craving and the reward, making it easier to drink less or not at all. The biggest barrier isn't the medication; it's that so few people know it's an option.
How naltrexone works for alcohol
Alcohol produces some of its pleasurable, reinforcing effects partly through the brain's opioid (endorphin) system — drinking releases endorphins that contribute to the "buzz" and reward. Naltrexone is an opioid antagonist: it blocks those opioid receptors, which dampens the reward and pleasure from alcohol and reduces craving.
What this means in practice:
- Less reward from drinking. With the opioid receptors blocked, alcohol becomes less rewarding — the drink that used to deliver a satisfying hit delivers less.
- Reduced cravings. Naltrexone reduces the urge to drink for many people, making it easier to cut down or abstain.
- It doesn't cause illness. Importantly, naltrexone does not make you sick if you drink (that's disulfiram/Antabuse, a completely different approach). You can drink on naltrexone; it just won't feel as rewarding.
- No abstinence required to start. Unlike some treatments, you don't have to already be sober — naltrexone can be started while you're still drinking, which removes a major barrier.
This places naltrexone among the evidence-based medications for addiction described in our medication-assisted treatment guide, and it's worth knowing it's distinct from the newer Ozempic-for-alcohol-cravings research — naltrexone is already approved and established.
Picture this: someone who drinks heavily every evening starts naltrexone. They still drink at first, but they notice the alcohol just doesn't "hit" the way it used to — the craving that used to feel irresistible is quieter, and a couple of drinks no longer pulls them toward a whole bottle. Over weeks, drinking less starts to feel natural rather than like a constant battle of willpower. The medication didn't force anything; it turned down the volume on the reward and craving, and that made change possible.
The Sinclair Method
One distinctive way to use naltrexone for alcohol is the Sinclair Method (TSM), which takes advantage of how the medication works:
- The core idea. With TSM, you take naltrexone about an hour before drinking. Because naltrexone blocks the reward from alcohol, drinking while the medication is active means the brain no longer gets the reinforcement it used to — and over time, through a process called pharmacological extinction, the learned drive to drink gradually weakens.
- Drinking is part of the process. Counterintuitively, TSM involves continuing to drink (while taking naltrexone beforehand) so that the extinction can happen. The goal is to "unlearn" the conditioned habit rather than to white-knuckle abstinence.
- Gradual reduction. Over months, many people on TSM find their drinking and cravings decline substantially, sometimes to abstinence or controlled, low-level drinking.
- It requires consistency. The method depends on always taking naltrexone before any drinking — the extinction only works when the reward is reliably blocked.
TSM is evidence-informed and has devoted adherents, though it should be done with medical guidance. It's a notably different philosophy from abstinence-first models, and it appeals to people who haven't succeeded with, or don't want, an all-or-nothing approach. As with any method, combining medication with support improves outcomes — our relapse prevention strategies guide and CBT for addiction guide cover complementary skills.
Oral vs injectable, and the evidence
Naltrexone comes in two main forms, and both are FDA-approved for alcohol use disorder:
| Form | What it is |
|---|---|
| Oral naltrexone | A daily pill (also sold as ReVia) |
| Injectable (Vivitrol) | A once-monthly long-acting injection |
The trade-offs:
- Oral naltrexone is flexible and inexpensive, and is required for the Sinclair Method (since it's taken before drinking). The main challenge is remembering to take it consistently.
- Injectable naltrexone (Vivitrol) is given once a month by a provider, which removes the daily-adherence challenge — helpful for people who struggle to take a daily pill. It can't be used for the timed, before-drinking Sinclair approach.
On effectiveness: naltrexone is evidence-based and FDA-approved for alcohol use disorder. Research shows it reduces heavy drinking, cravings, and relapse for many people, especially when combined with counseling or support. It doesn't work equally well for everyone — response varies — but it's a well-established, effective option that far too few people are offered. (A note: because naltrexone blocks opioid receptors, people who use opioids must be off them before starting, and it isn't combined with opioid pain medication — a prescriber will screen for this.)
For where naltrexone fits among alcohol treatments overall, our medications for alcohol use disorder guide compares it with other options, and our signs of alcoholism guide helps you assess whether treatment is warranted.
What to expect and getting started
If you're considering naltrexone for alcohol, here's the practical picture:
- Talk to a provider. Naltrexone requires a prescription. A doctor will review your health (including liver function and any opioid use) and discuss whether oral or injectable, and whether a Sinclair-style or abstinence-oriented approach, fits your goals.
- You can start while drinking. You don't need to detox or be sober first — though for heavy drinkers, any plan to stop entirely should consider withdrawal risks (see our how long does alcohol withdrawal last guide).
- Side effects are usually mild. Nausea, headache, dizziness, or fatigue can occur, often easing over time; serious effects are uncommon, and liver function is monitored.
- Give it time and pair it with support. Naltrexone works best combined with counseling, support, or the structured TSM approach; it's a tool that makes change easier, not a standalone cure.
- Set clear goals. Whether your goal is abstinence or reduced drinking, naltrexone can support both, which is part of what makes it flexible and approachable.
The bottom line is encouraging: alcohol use disorder is treatable, and naltrexone is an effective, accessible, FDA-approved medication that many people have never been told about. The SAMHSA national helpline (1-800-662-HELP) is free, confidential, and available 24/7 for treatment referrals. Other resources on RehabPulse:
Frequently asked questions
How does naltrexone work for alcohol? Alcohol produces some of its pleasure and reinforcement through the brain's opioid (endorphin) system. Naltrexone is an opioid antagonist that blocks those receptors, which dampens the reward and pleasure from drinking and reduces cravings. As a result, alcohol becomes less rewarding and the urge to drink decreases, making it easier to cut down or abstain. Importantly, naltrexone does not make you sick if you drink — it simply makes drinking less rewarding — and you don't have to be sober to start it.
What is the Sinclair Method? The Sinclair Method (TSM) is an approach that uses naltrexone by taking it about an hour before drinking. Because naltrexone blocks alcohol's reward, drinking while it's active means the brain stops getting the reinforcement it used to, and over time the learned drive to drink gradually weakens through a process called pharmacological extinction. TSM involves continuing to drink (with naltrexone beforehand) so this unlearning can happen, and many people find their drinking and cravings decline substantially over months. It requires always taking naltrexone before any drinking and is best done with medical guidance.
Does naltrexone make you sick if you drink? No. Naltrexone does not cause illness when you drink — that's a different medication, disulfiram (Antabuse), which causes an unpleasant reaction with alcohol. Naltrexone instead works by blocking the reward and craving, so you can physically drink while taking it, but the alcohol won't feel as rewarding. This is actually central to how it (and especially the Sinclair Method) works, and it's part of why you don't need to be abstinent to begin treatment.
Is naltrexone or the injection (Vivitrol) better? Both are FDA-approved and effective; the right choice depends on the person. Oral naltrexone is a flexible, inexpensive daily pill and is required for the Sinclair Method (since it's timed before drinking), but it depends on remembering to take it. Injectable naltrexone (Vivitrol) is a once-monthly shot that removes the daily-adherence challenge, which helps people who struggle with a daily pill, though it can't be used for the timed Sinclair approach. A provider can help you choose based on your goals and circumstances.
Is naltrexone effective for alcohol use disorder? Yes. Naltrexone is an evidence-based, FDA-approved medication for alcohol use disorder, shown to reduce heavy drinking, cravings, and relapse for many people, especially combined with counseling or support. It doesn't work equally well for everyone — response varies — but it's a well-established, effective option that is significantly underused, largely due to lack of awareness among patients and prescribers. Because it blocks opioid receptors, people who use opioids must be off them before starting, which a prescriber will screen for.
Sources and references
- National Institute on Alcohol Abuse and Alcoholism (NIAAA). Medications for Alcohol Use Disorder. niaaa.nih.gov
- National Library of Medicine (MedlinePlus). Naltrexone. medlineplus.gov
- U.S. Food and Drug Administration (FDA). Naltrexone / Vivitrol prescribing information. fda.gov
- National Institute on Drug Abuse (NIDA). Medications to Treat Substance Use Disorders. nida.nih.gov
- Substance Abuse and Mental Health Services Administration (SAMHSA). National Helpline — 1-800-662-HELP (4357), free and confidential 24/7. samhsa.gov/find-help/national-helpline
- National Institute on Alcohol Abuse and Alcoholism (NIAAA). Treatment for Alcohol Problems. niaaa.nih.gov
- SAMHSA. FindTreatment.gov treatment locator. findtreatment.gov
