The Sinclair Method is a way of using naltrexone that breaks the habit of drinking by exploiting how habits get unlearned in the first place. You take one tablet an hour before each drinking session, and only on days you drink. Over months, the urge to drink fades because the conditioning behind it is being unwound, drink by drink. This article is part of our Naltrexone hub, the complete guide to using naltrexone for alcohol use disorder.
The pillar covers what the method is in summary. This article covers how to actually do it: the one-hour window in practice, what counts as drinking, what to do when plans change, how to track compliance, and what realistic month-by-month change looks like. If you’ve already decided to try TSM, this is the operating manual.
# A short refresher on the mechanism
The medical name for what TSM does is pharmacological extinction. The basic idea: every time you drink while naltrexone is blocking your opioid receptors, your brain gets less reward feedback than usual. Over hundreds of drinking sessions, the learned association between alcohol and pleasure weakens. The compulsion fades.
The opposite is also true. Every drink without naltrexone reinforces the old association. So TSM has one rule that overrides everything else: never drink without taking the tablet first.
This is what makes the protocol so different from daily naltrexone or any other medication. It’s not symptom relief. It’s deliberate retraining. Compliance with the one rule is what turns it into the most effective medical treatment we have for alcohol use disorder, with Sinclair’s published data showing about 78% of compliant patients reduce their drinking significantly or stop entirely. Skip the tablet on a single drinking session and you’ve worked against yourself that day.
That sounds harsher than it is in practice. People miss doses. The method still works, just slower. But knowing the principle keeps you honest about what’s helping and what’s hurting.
# The one-hour window, in real life
The standard instruction is: take the tablet roughly one hour before your first drink. That’s not a suggestion. It’s the time the medication needs to reach effective blood levels and saturate the receptors. If you drink before the hour is up, you’ve drunk on a partially blocked receptor system, which is closer to drinking without medication than drinking with it.
In practice “one hour” is a useful rule with about thirty minutes of forgiveness on either side. Forty-five minutes is fine. Two hours is also fine. Fifteen minutes is not. Three hours is fine for the first drink but you’ll want a redose if the session goes long, which we’ll get to.
Some practical patterns that work:
The pub plan. You’re meeting friends at the pub at 7. You take the tablet at 6 with your dinner. Easy.
The end-of-work-day signal. You’re a “first-drink-when-I-get-home” person and you usually crack a beer around 7. You take the tablet at 6, before you leave the office or finish work. Becomes a routine.
The dinner reservation. Booked at 8. You take the tablet at 7 before you leave home. The first glass of wine arrives at 8:30, plenty of time.
The patterns that don’t work are the ones where drinking is impulsive. “We’re walking past a wine bar, fancy a drink?” If you say yes, you’re drinking in 5 minutes, not 60. That’s not a TSM session. The rule for impulsive drinks is hard but simple: either decline, delay an hour, or accept that this drink works against your protocol.
Most people, after the first few weeks of TSM, find themselves naturally planning drinking sessions an hour ahead. The medication trains the discipline as much as the discipline trains the medication.
# What counts as a drinking session
This trips people up. “Am I going to drink today?” sounds binary. It isn’t.
The clearest rule: if there’s any chance you might have an alcoholic drink in the next 12 hours, take the tablet. The cost of taking it and not drinking is zero. The cost of not taking it and drinking is a wasted protocol day, possibly a strengthened habit.
Some grey areas:
A glass of wine with dinner counts. It’s still a drink, your brain still gets reward feedback, the protocol still applies. People underestimate this and skip TSM for “just one glass” with a partner. That single glass is exactly the kind of low-key reinforcement TSM is designed to interrupt.
Champagne at a wedding counts. Even if you’re only planning one toast and then water for the rest. Take the tablet.
0.0% beer doesn’t count. It contains no alcohol, doesn’t activate the reward circuit, doesn’t need TSM. Same for mocktails and any alcohol-free wine.
Cooking with wine doesn’t count. The amount left after cooking is negligible.
Tasting at a wine shop or distillery counts. Even small sips of multiple drinks are still drinks. Take the tablet an hour before.
When in doubt, take the tablet. The medication is safe and cheap, and the cost of being wrong is negligible compared to the cost of an unmedicated session.
# What to do on dry days
The flip side of TSM is that on days you don’t drink, you take nothing. Your liver gets a break. Side effects accumulate less. You get to feel the difference between a protocol day and an off day.
The practical questions:
What if I plan to be dry but change my mind? Take the tablet as soon as you decide, then wait an hour before the first drink. If you decide and drink within fifteen minutes, that session was effectively unmedicated. Better to delay an hour or skip the drink.
What if I have one drink and stop? That one drink either had medication or it didn’t. The “stopping after one” doesn’t change the protocol question. If you took the tablet, that was a TSM-compliant session even if it was only one drink. If you didn’t, it was a non-compliant drink, regardless of how few there were.
What if dry days are also stressful days? This is when the wheels can come off. You planned a dry Tuesday, work was awful, you find yourself eyeing the wine. The honest answer: take the tablet. Drink with it. The point of TSM is to get through this kind of day without reinforcing the old pattern, not to hold the line on dry-day rules at the cost of unmedicated drinking.
The protocol is designed to be flexible about when you drink. It’s strict about whether the medication is on board when you do. Get that backwards and it doesn’t work.
# Compliance, missed doses, and recovery
Real TSM looks like this: most sessions are correctly medicated. A few aren’t. Progress still happens, but the unmedicated sessions slow it down.
If you miss a dose and drink anyway, the most important thing is not to spiral. One unmedicated session doesn’t undo months of TSM progress. It just means that day’s drinking reinforced rather than weakened the association. Take the tablet correctly next time.
If you find yourself missing doses regularly (more than once or twice a month), it’s worth examining why. The two most common causes:
Drinking is genuinely impulsive for you. Pubs you walk past, surprise invitations, fights with partners. If your drinking pattern is dominated by impulses, daily naltrexone might fit better. The pillar’s section on daily versus targeted covers this tradeoff.
You’re forgetting in the morning. The fix is to put the tablet bottle somewhere you’ll see it before drinking time. Next to your keys, on top of your laptop, with your toothbrush. Set a phone alarm if needed. The mechanical fix to a mechanical problem.
The rule of thumb that works: if you’re hitting 80%+ compliance you’re getting the protocol’s benefit. If you’re below 50% it’s not really TSM, it’s occasional naltrexone, and you should consider switching to daily.
# What about long sessions
Naltrexone’s effective window is roughly 12 hours, with peak effect around two to four hours after the dose. For most drinking sessions this is fine. For longer ones (wedding receptions, festival days, all-day events) you may need a redose.
The standard guidance: if your drinking session is going to run more than 8-10 hours, take a second tablet 6-8 hours after the first. So if you took your morning tablet at 11 AM for a wedding starting at noon, take a second around 6-7 PM if you’re still drinking at the evening reception.
Most prescribers are comfortable with this. Worth confirming with yours specifically, especially if you’re nausea-prone in the first weeks. Two doses in one day at 50mg each (100mg total) is well within standard ranges.
# Tracking compliance: what to record
Even if you trust the method, tracking what you actually do helps for two reasons. First, the trajectory is your evidence the protocol is working. Second, looking back at sessions where you forgot the tablet helps you spot the patterns that lead to misses.
The minimum to track per drinking session:
- Whether you took the tablet
- The gap between dose and first drink (was it really an hour? Or was it 25 minutes because you forgot until last minute?)
- How many drinks you had
- How long the session ran
The pattern people see over the first three months: dose-to-drink gaps tighten up (you remember earlier), drinks-per-session start to drop modestly, total sessions stay roughly the same. By month six, sessions tend to drop too, because the urge to drink in the first place has eased.
Logging this in AlcoLog handles drinks-per-session and session length automatically. The Medications card stores naltrexone dose timestamps separately, so the gap between your last dose and the start of your next session is visible at a glance. Cross-referencing the two over weeks is what tells you whether your timing is actually as good as you think it is.
# What month-by-month change looks like
This is the part nobody warns you about. TSM is gradual in a way that feels like nothing’s happening for the first month or two.
Month one. Side effects (nausea, headache, sleep disturbance; see our guide on naltrexone side effects) are usually at their worst in the first two weeks and fade by day 14-21. You won’t feel any reduction in craving yet. You may notice the buzz from drinking is slightly muted on tablet-protected sessions. That’s the medication working at the receptor level, not the conditioning shift yet.
Month two. Side effects gone for almost everyone. The first hint of behavioural change usually shows up here: you reach the bottom of a pour and don’t immediately want another. The brakes work slightly better. Don’t read too much into a few good sessions, but a trend in this direction is a good sign.
Month three. This is the standard checkpoint where prescribers assess whether the protocol is helping. Compliant patients usually see drinks-per-session drop by 20-40% by month three. The “I could take it or leave it” feeling starts to surface. Some people are still waiting for it; that’s also normal.
Months four to six. The deeper change. Sessions drop in frequency, not just intensity. People report finding themselves at home on a Friday night realising they didn’t think about drinking. The compulsion has eased.
Month six and beyond. Most prescribers will check progress at six months and discuss whether to continue, taper, or switch protocols. Some people stay on TSM indefinitely. Some shift to occasional use. A small percentage stop drinking entirely; a larger percentage settle into a level of moderate drinking they can sustain without effort.
The mistake people make is judging the method at month one. Everything important happens between months three and six. Quitting at week six because “it isn’t working” is quitting before the data is in.
# Common mistakes that wreck the protocol
A short list, in order of frequency:
- Stopping too early. As above. Three months minimum, six months ideal, before deciding.
- Drinking unmedicated to “test” if you still want to. This actively reinforces the old pattern. The temptation is real but the cost is real too.
- Taking the tablet mid-session because you forgot. Doesn’t help. The receptors aren’t blocked from the first drink. Skip and resume next session.
- Reducing the dose to “see if you still need it.” The 50mg dose is the trial-validated amount. Lowering it usually reduces effectiveness without reducing side effects (those mostly cap out by week three anyway).
- Trying to white-knuckle it alongside. Some people add severe restriction (only one drink per session, never on weekdays) to “speed it up.” The method works best when you drink at roughly your normal frequency and let the medication do its job. Voluntary restriction doesn’t accelerate extinction.
- Mixing daily and targeted ad-hoc. Pick one approach and stick with it for at least three months. Switching mid-stream blurs your read on what’s actually happening.
# When TSM isn’t the right fit
Honest list:
- If your drinking is dominated by impulse rather than planning, daily dosing usually fits better.
- If you can’t reliably remember a tablet an hour ahead, daily fits better.
- If you’ve decided you want to stop entirely from day one rather than reduce gradually, daily dosing combined with abstinence support (rather than continued drinking) is the better path.
- If you’re avoiding alcohol for medical reasons (liver disease, pregnancy planning) you shouldn’t be using either approach without specific medical supervision.
For everyone else who can plan a drinking session an hour ahead, TSM has the strongest evidence base and the lowest cumulative drug burden of any pharmacological approach to alcohol use disorder.
# How AlcoLog helps with the Sinclair Method
AlcoLog’s Medications card is built for protocols like TSM. Each dose gets a timestamp; the redose timer reminds you when a long session needs a second tablet; Pro-tier location reminders fire when you arrive at a saved place (the pub, a friend’s house) so you remember to take a tablet if you forgot earlier. The medication card sits next to your drink log, so the dose-to-first-drink gap is always visible.
AlcoScore, the 0-100 health score the app produces from your drinking patterns, is deliberately separate from medication tracking. The app’s view: medication is a tool you choose to use, not a behaviour the app should grade you on. Your dose log informs you, not your score.
Privacy stays local. The dose log lives on your device, not on a server. If you want to share it with a doctor, CSV export of your last 10 sessions is free; unlimited export and PDF reports are on Pro.
