The Sinclair Method (TSM) with Naltrexone: A Complete Guide
Medically reviewed by Joseph Volpicelli, MD, PhD
If you've tried cutting back on alcohol and felt like willpower alone wasn't enough, you're not alone, and there's science to explain why. The Sinclair Method with naltrexone takes a fundamentally different approach to alcohol use disorder (AUD), working with your brain's own biology rather than against it. Here's what you need to know about this evidence-based treatment and how it may help you regain control.
What Is the Sinclair Method?
The Sinclair Method (TSM) is an evidence-based treatment for alcohol use disorder developed by Dr. John D. Sinclair, a neurobiological researcher who spent decades studying how the brain learns and unlearns addictive behaviors. Unlike abstinence-based programs that require you to stop drinking immediately, the Sinclair Method of alcohol treatment allows, and in fact requires, that you continue drinking at the start of treatment. That distinction is not a loophole. It's the mechanism.
At the center of TSM is naltrexone. Taken at least one hour before your first drink, naltrexone blocks opioid receptors involved in alcohol reward. By blunting alcohol’s reinforcing effects, naltrexone gradually weakens the learned association between alcohol and reward. Dr. Sinclair described this process as "pharmacological extinction."
In simple terms, it means someone slowly becomes less interested in drinking.
How Does the Sinclair Method Work?
To understand how the Sinclair Method works, it helps to understand why alcohol becomes compulsive in the first place.
Every time a person drinks, their brain releases chemicals linked to pleasure. Over time, the brain learns that drinking equals reward, and this reinforces drinking behavior. For people genetically predisposed to AUD, this reinforcement cycle becomes especially powerful.
For some people, these learned patterns can continue even after long periods of abstinence.
Here's how the cycle works during treatment:
- Take naltrexone at least one hour before your first drink, every single time you drink.
- Drink as you normally would.
- Naltrexone blocks the effects of endorphins, which can blunt the reward signal.
- Extinction occurs when the brain no longer associates alcohol with reward, reducing or eliminating compulsive drinking behavior.
- Many people find that cravings and heavy drinking decrease over time.
Compliance with the "take it before every drink" rule is critical. If drinking happens without naltrexone, the reward pathway fires again, undermining the extinction process.
Does the Sinclair Method Work?
Research supports targeted naltrexone as an effective approach for reducing alcohol consumption and heavy drinking. Clinical trials have found meaningful reductions in drinking when naltrexone is taken in anticipation of drinking or high-risk situations. The dose most commonly studied in targeted naltrexone trials is 50 mg.
Dr. John Sinclair reported particularly encouraging results from an open-label Finnish treatment program. Among 147 patients who had received enough treatment to be evaluated, 78% were classified as treatment successes, with substantial reductions in alcohol consumption. This frequently cited 78% figure should not be interpreted as meaning that 78% of all patients using the Sinclair Method will achieve pharmacological extinction.
Consistency is important. With the Sinclair Method, naltrexone is taken before drinking so that opioid receptors are blocked when alcohol is consumed. Research also suggests that individual response to naltrexone varies considerably, and not everyone responds to treatment in the same way.
The Sinclair Method Protocol: What To Expect
Practicing the Sinclair Method with naltrexone is straightforward, but consistency is important.
The central rule: Take naltrexone, typically 50 mg, before every planned drinking occasion, following the timing recommended by your prescriber.
What happens next varies from person to person:
- Early in treatment: Some people notice fairly quickly that alcohol feels less rewarding or that the urge to continue drinking is weaker. Others notice little change at first.
- Over the following weeks: Drinking quantity, heavy-drinking episodes, or craving may gradually decrease. Clinical trials of targeted naltrexone have found meaningful reductions in drinking during treatment.
- Over several months: Continued use gives repeated drinking experiences under opioid-receptor blockade an opportunity to weaken learned alcohol-reward associations. Some people become much less interested in alcohol, while others experience more modest reductions.
- Over the longer term: There is no established timetable for reaching “extinction.” Response varies, and treatment should be reviewed with your healthcare provider if drinking is not improving or if your goals change.
The goal is not to white-knuckle abstinence. The aim is to reduce alcohol’s reinforcing effects so that drinking becomes easier to control and, for some people, progressively less compelling.
How the Sinclair Method Differs From Traditional Abstinence-Based Approaches
Traditional abstinence-based programs, such as 12-step programs like Alcoholics Anonymous, operate on the premise that a person must stop drinking completely and stay stopped. That model has helped many people, but it leaves a significant gap for those who can't access immediate abstinence or who have tried and not been able to sustain it.
The Sinclair Method of alcohol treatment approaches the problem differently:
| Traditional Abstinence-Based Treatment | The Sinclair Method With Naltrexone |
|---|---|
| Requires stopping drinking immediately | Allows continued drinking during treatment |
| Relies heavily on willpower | Targets the neurological reward cycle |
| Abstinence doesn't retrain the brain | Pharmacological extinction retrains the brain |
| Cravings often persist long-term | Cravings reduce as extinction progresses |
| May involve daily group meetings | No required meetings or formal program |
Neither approach is right for everyone. The main difference? The goal behind abstinence-based programs is to avoid drinking, whereas the goal behind TSM is to feel indifferent about drinking.
Is the Sinclair Method Right for You?
The Sinclair Method with naltrexone may be worth discussing with a provider if:
- You have a pattern of drinking more than you intend to
- You've tried cutting back on your own and found it difficult to maintain
- You're not ready to quit drinking completely
TSM is not appropriate for everyone. People with severe liver disease, those currently taking opioid medications, or those with certain medical conditions may not be candidates for naltrexone.
| Take the First Step Toward a Different Kind of Recovery |
|---|
| Oar Health makes it easy to get started with TSM from home, with no waiting rooms, no pharmacy lines, and no judgment about your goal. Complete a short online assessment, receive a personalized treatment plan from a licensed medical provider, and have naltrexone discreetly delivered to your door for as little as $99/month. |
Frequently Asked Questions
Do I need to take naltrexone forever?
TSM advocates, including Dr. Sinclair, generally recommend that anyone who continues to drink take naltrexone indefinitely to prevent the reward pathway from rebounding. If you reach full abstinence and no longer drink, the need for ongoing naltrexone becomes a conversation to have directly with your provider.
Does naltrexone have side effects?
Naltrexone is FDA-approved and has a well-established safety profile, but side effects are possible. The most commonly reported include nausea, fatigue, headache, and appetite changes, particularly in the early weeks of use. Starting at a lower dose can sometimes reduce initial side effects.
Can I use the Sinclair Method if I only drink occasionally rather than daily?
Yes. Targeted naltrexone has been studied in people who do not drink every day, including people whose main problem is episodic heavy drinking. The key is taking naltrexone consistently before drinking, according to the prescribed timing. People vary widely in how quickly they notice changes in craving, alcohol reward, or the tendency to keep drinking once they start. Research has not established a specific number of drinking or “extinction” sessions required for improvement.
This article was medically reviewed by Joseph Volpicelli, MD, PhD, a Senior Adviser to Oar Health whose research established naltrexone as a treatment for alcohol use disorder. Review confirms the clinical information here was accurate and current as of October 15, 2026. It is not a substitute for advice from your own clinician.
