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Managing alcohol use while recovering from opioid use disorder (OUD) isn’t easy, especially if abstinence-only programs haven’t been the right fit for you.
The Sinclair Method is a harm-reduction approach for some people with alcohol use disorder (AUD). It uses naltrexone before planned drinking rather than requiring complete abstinence from the start.
This article covers how the Sinclair Method works, how it differs from other naltrexone-based treatments, who might be a candidate, and what the evidence and safety picture look like.
With the Sinclair Method, people take naltrexone before drinking alcohol. Naltrexone is approved by the U.S. Food and Drug Administration (FDA) to treat alcohol use disorder, but taking it only before drinking is an off-label dosing method with less direct research than standard daily treatment.
Supporters of the method propose that repeatedly blocking alcohol’s rewarding effects may gradually weaken the urge to drink. This theory is called pharmacological extinction, but it hasn’t been firmly proven in clinical studies.
Researcher John David Sinclair developed this approach in the late 1980s. He found that naltrexone, originally used to treat OUD, could also help reduce alcohol consumption.
The science behind the Sinclair Method comes down to timing and reducing the rewards from drinking.
With the Sinclair Method, naltrexone is usually taken before planned drinking rather than every day. Some versions of the method advise taking a tablet about one to two hours before drinking. However, this timing is part of the Sinclair protocol and is not an FDA-approved dosing schedule.
For standard treatment of AUD, oral naltrexone is commonly prescribed once a day. A healthcare provider should decide which schedule, if any, is safe and appropriate for you.
Drinking alcohol triggers a release of endorphins that bind to opioid receptors, producing the pleasurable feeling that reinforces drinking. Naltrexone blocks those receptors, so alcohol stops feeling as rewarding.
If you keep drinking while naltrexone blocks that reward, your brain gradually unlearns the connection between alcohol and pleasure — this is called pharmacological extinction.
Naltrexone treats alcohol use disorder in more than one way, and it’s also prescribed for opioid use disorder.
The standard regimen for AUD is 50 milligrams of naltrexone daily. The Sinclair Method instead uses targeted dosing before planned drinking.
Research on targeted, as-needed dosing similar to the Sinclair Method shows it’s linked to fewer drinking days and less heavy drinking for people with milder alcohol use disorder. However, these findings may not apply to everyone with AUD.
Many traditional programs, including some 12-step programs, focus on complete abstinence. The Sinclair Method takes a harm-reduction approach that allows continued drinking at the start. However, a person does not need to keep drinking for naltrexone to work. Naltrexone can support either reduced drinking or abstinence, depending on the person’s treatment goals.
Several other medicines may be considered for alcohol use disorder. Naltrexone and acamprosate are both commonly used options when appropriate.
Naltrexone works differently by condition. For OUD, you need to be opioid-free for about seven to 14 days before starting, because taking it while opioids are active can trigger sudden, severe withdrawal symptoms.
Once started, naltrexone helps prevent relapse by blocking the effects of opioids if someone were to use them again. The Sinclair Method works the opposite way — it deliberately pairs naltrexone with active drinking, not abstinence.
If you already take daily naltrexone or get monthly extended-release naltrexone for opioid use disorder, do not add an extra dose before drinking unless your prescriber specifically tells you to. Your healthcare provider should review your alcohol use, treatment goals, current dose, side effects, and response to treatment.
Your doctor will consider the following before deciding if this approach is appropriate for you:
Certain situations call for extra caution or a different approach, such as:
If you and your doctor decide the Sinclair Method fits, treatment tends to follow a fairly predictable pattern.
Most people have a follow-up appointment about one week after their first dose, followed by monthly check-ins, with liver enzyme checks after about one month and then every three months. Sticking with the plan matters, since you’ll need to take naltrexone before every drinking occasion for it to work.
Research has not firmly established the ideal length of targeted treatment or whether every drinking occasion must be paired with a dose to produce a benefit.
Some people notice changes in cravings or drinking within weeks, while others take longer or do not respond. Your healthcare provider can help assess whether treatment is working and how long it should continue.
Counseling, such as cognitive behavioral therapy (CBT), and peer support may improve outcomes alongside naltrexone, although no single behavioral approach has been proven best.
Naltrexone-based treatment for alcohol use disorder has a solid research base, though most large studies didn’t test the Sinclair Method’s dosing pattern on its own.
A large review found that daily oral naltrexone provides a modest benefit for AUD. For every 11 people treated, one additional person avoided returning to heavy drinking compared with a placebo (inactive treatment). For every 18 people treated, one additional person avoided returning to any drinking.
Most evidence comes from studies of daily oral naltrexone rather than the Sinclair Method’s targeted dosing schedule, so it’s unclear whether the two approaches provide similar benefits. It helps to talk with a doctor about realistic expectations.
Like any medication, naltrexone comes with safety considerations worth understanding before you start.
Naltrexone shouldn’t be started while someone is using opioids or is physically dependent on them. Doing so can cause sudden, severe withdrawal.
A person may also overdose by taking large amounts of opioids to try to overcome naltrexone’s blocking effect. Overdose risk may also increase as a naltrexone dose wears off or after treatment ends.
Naltrexone should also be used cautiously with certain liver conditions, though research suggests it’s generally safe for people with alcohol-related liver disease, including some forms of cirrhosis (severe, permanent scarring of the liver), when guided by a doctor.
People who have been drinking heavily or even regularly may need medically supervised withdrawal, because abruptly cutting down alcohol can result in seizures, delirium, or other serious complications. It is important to tell your healthcare provider how much and how often you drink before reducing substantial alcohol use.
Common side effects of naltrexone include:
Nausea is typically mild and eases within a few days, and your doctor may lower your dose temporarily if side effects are bothersome.
Serious liver problems are uncommon at standard naltrexone doses, but hepatitis and liver dysfunction have been reported. These problems are not limited to people who already have alcohol-related liver damage. Your provider may order liver tests based on your health and symptoms.
Stop taking naltrexone and seek medical advice promptly if you develop yellow skin or eyes, dark urine, pale stools, severe pain in the upper-right abdomen, or unusual tiredness.
On MyOpioidRecoveryTeam, people share their experiences with opioid use disorder, get advice, and find support from others who understand.
What would you want to know from someone who’s tried a harm-reduction approach to drinking? Let others know in the comments below.
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