Do I Need a Detox to Start The Sinclair Method?
For adults in the UK thinking about The Sinclair Method, or about stopping or cutting down. Facts checked on 23 October 2026. By Matt Brindley.
In short
No detox as standard. The Sinclair Method doesn't ask you to stop drinking. But if your body depends on alcohol, a doctor may recommend a detox first.
Speed matters. If your body depends on alcohol, stopping or cutting down too fast can be dangerous. It can cause seizures or delirium tremens.
Check first: If you get the shakes, sweats or nausea without a drink, need a drink in the morning, drink heavily every day, have had a seizure or hallucinations when you've stopped before, or have epilepsy, liver disease or other serious health problems. Speak to your GP or local alcohol service before you change anything.
Naltrexone doesn't treat withdrawal. If your body depends on alcohol, that's looked at by a doctor first.
Emergency: a seizure, confusion, or seeing or hearing things that aren't there after stopping or cutting down means call 999.
Do I have to stop drinking first?
Not usually. Most people who've looked for help with their drinking have been told the same thing first: stop. The Sinclair Method doesn't. You continue to drink, and a prescription medicine, naltrexone, is taken before you do.
Naltrexone reduces the reward your brain gets from alcohol. The aim is that, over time, the desire to drink becomes weaker. How well that works varies from person to person.
Dr John David Sinclair, who developed the approach, explained it as extinction: the brain gradually unlearns a habit that has stopped paying off. It's often called pharmacological extinction.
So the real question isn't "do I have to stop first?". It's "how fast is it safe for my body to cut down?"
Is it dangerous to stop drinking suddenly?
It can be, if your body has come to depend on alcohol.
When you've been drinking heavily for a long time, your body adapts to having alcohol in it. Take it away too quickly and it reacts. That reaction is withdrawal.
It doesn't only follow stopping. It can follow stopping or significantly reducing what you drink. It isn't drinking less that causes it. It's drinking less faster than your body can cope with.
Alcohol withdrawal symptoms and when they happen
Symptom | When it usually happens | Source |
|---|---|---|
Anxiety, poor sleep, nausea or vomiting, a racing heart, sweating and shaking | Starts 6 to 12 hours after the last drink and usually lasts 3 to 7 days. Some symptoms can last for months | |
Seizures (fits) | 12 to 48 hours after stopping or significantly reducing | |
Delirium tremens (severe confusion, seeing or hearing things that aren't there), a medical emergency | Day 2 to 3, occasionally up to day 5 |
When do I need a doctor's help first?
People with moderate or severe dependence should generally be offered medically assisted withdrawal. A planned reduction is only for some people, and only if a clinician decides it suits them.
Speak to your GP or local alcohol service before you change how much you drink if any of these apply to you:
you've had a seizure, hallucinations, delirium tremens or Wernicke-Korsakoff syndrome when you've stopped or cut down before;
you have epilepsy;
you have serious or unstable physical or mental health problems;
you get shaking, sweating, anxiety or nausea when you go without a drink, or need a drink in the morning to feel normal;
you drink very heavily every day;
you have liver disease.
If you're not sure whether you're dependent, that's a reason to ask, not a reason to wait and see.
What should I do first?
Speak to your GP or local alcohol service (England; elsewhere in the UK, see the links under "Where else can I get help?") before you change how much you drink. Be honest about how much that is. They've heard it before, and they need the real number to keep you safe.
If they think you need help to stop, the usual route is medically assisted withdrawal, often called a detox. It's a routine part of NHS alcohol care. The medicine for it can often be taken at home or while attending a local service, and some people need a short stay in a medically supported unit.
For people at high risk of seizures or delirium tremens, NICE recommends offering admission to hospital for it.
The medicines used for a detox are different from the one used in The Sinclair Method. Our page on alcohol withdrawal medication in the UK explains which is which.
Is it safe to cut down gradually?
It can be, but it isn't a do-it-yourself plan. A clinician who's competent in assessing alcohol dependence should decide whether you're suitable, then build and monitor the plan with you, including how fast to go.
One signal matters for everyone. If you start getting withdrawal symptoms while cutting down, you're cutting down too quickly. The usual step is to hold at a steady amount for a few days while you get medical advice.
Why doesn't The Sinclair Method start with a detox?
Because nobody is asked to stop. You start from wherever your drinking is today. The process meets you where you're at.
Any reduction is expected to be gradual, over weeks and months, not overnight. That's why we don't ask anyone to cut down before they start.
That doesn't make it safe for everyone to start the same way. If your body already depends on alcohol, the speed of any reduction matters, and that's a medical judgement, not a coaching one.
Does naltrexone help with alcohol withdrawal?
No. Naltrexone reduces the reward from drinking. It isn't a withdrawal treatment, and it won't stop withdrawal symptoms or seizures if you cut down too fast. It's not designed to. Withdrawal is managed with other medicines, such as benzodiazepines.
It's also worth knowing how differently naltrexone is used. In the UK it's usually offered once you've stopped drinking, as a daily medicine to help prevent relapse.
The Sinclair Method uses it in a targeted way: taken before drinking, while people are still drinking. Naltrexone has been studied in trials, including targeted use:
In a Finnish trial of 121 people with alcohol dependence who started without a detox, naltrexone helped only when combined with coping-skills support. It was taken daily for 12 weeks, then only when craving.
In a US trial of 163 people who wanted to cut down, targeted naltrexone helped men: by week 12 they drank significantly less than the other groups.
Across 50 trials with 7,793 people, a Cochrane review, mostly of daily naltrexone, found it cut the risk of heavy drinking by about 17% compared with placebo.
The evidence is real, and it's also modest, which is why we never promise results. Taking naltrexone before drinking is a different way of using it from the usual UK approach, and your prescriber will explain what that means for you.
Whether naltrexone is right for you, and exactly how to take it, is decided by the prescriber. Before prescribing they'll check, among other things, your liver health, whether you take or might need opioid medicines, including some strong painkillers and cough medicines (naltrexone blocks them, and taking it while dependent on opioids can cause dangerous withdrawal), and whether you are or could be pregnant.
That's why you won't find dosing instructions on this page.
What I see in our members
One of the first things people ask me is why we're not telling them to cut down straight away.
Most of them have spent years being told to stop, and they've done it, more than once. For most of them, stopping wasn't the hard part… staying stopped was.
We don't chase the numbers. We start where your drinking actually is, and we don't set reduction targets to white-knuckle towards.
We look at what's changing over time. In my experience, the changes people make overnight are the ones most likely to unravel.
But there's a line I won't blur. Dependency, the shaking, the sweats, needing a drink in the morning, is physical. It's a separate thing from what the tablet does, and no amount of coaching fixes it.
When someone tells me that's part of their day, we don't start anything until their GP or local alcohol service has looked at it.
How do I start with Rethink Drink?
1. Usually, a free discovery call. This isn't a medical assessment. It's a real conversation about how The Sinclair Method works, the science behind it and what the process really looks like, with as much time for your questions as you need.
We'll also ask a few health questions. If anything raises a red flag, we put it to the prescribing doctor before you go any further, and if it looks like your body may depend on alcohol, we'll ask you to speak to your GP or local alcohol service first.
2. A medical consultation. An independent prescribing doctor decides whether treatment is suitable for you, and if so, what to prescribe. Any prescription is dispensed by an independent partner pharmacy. Both make their own clinical decisions; we don't prescribe or dispense.
3. Coaching, for the other half of the work. The tablet is only half of it. The other half is you: your habits, your triggers, your routines, and why you drink the way you drink.
That's what coaching is for. You log your drinking so we can both see what's really changing, not what it feels like on a bad day. Your coach helps you make sense of it, spot patterns, and build a life where alcohol matters less, at a pace that suits you.
Between calls, you've got support channels 7 days a week to message when you need us.
And if anything doesn't look right along the way, we spot it early and bring the doctor in.
Where else can I get help?
The Sinclair Method is one option. Our guide to alcohol treatment in the UK compares every option side by side. These are others, and most are free:
Drinkline, the national alcohol helpline: 0300 123 1110, free and confidential (weekdays 9am to 8pm, weekends 11am to 4pm).
Your local alcohol service, for assessment, detox and ongoing support: find one in England. In Scotland, Wales or Northern Ireland, see Alcohol Change UK's list of local services.
Alcoholics Anonymous, free self-help groups built on the 12 steps: alcoholics-anonymous.org.uk.
SMART Recovery, groups that help you build motivation and practical tools to change: smartrecovery.org.uk.
WithYou, a UK-wide charity for people affected by drugs and alcohol: wearewithyou.org.uk.
Alcohol Change UK, with a drinking check and links to local support: alcoholchange.org.uk.
Drinkaware, clear information on alcohol withdrawal.
If it's someone you love: Al-Anon for families and friends, Adfam for families, and Nacoa (0800 358 3456) for children of parents who drink.
Get help now if you need it
Call 999 or go to A&E if you or someone else has severe withdrawal symptoms after stopping or cutting down, such as shaking visibly, being unusually restless, irritable or upset, confusion, seeing, hearing or feeling things that aren't there, or a seizure. Don't drive to A&E: ask someone to take you, or call 999 for an ambulance. (NHS)
If you're worried but it isn't an emergency, a good place to start is your GP. If you need advice urgently and can't reach your GP, call 111 or use NHS 111 online.
Please look after yourself
This page is here to help you understand your options. It isn't medical advice, and it can't replace a conversation with a doctor who knows you. Before you change how much you drink or start any medication, speak to your GP or a prescriber.
I hope this post has been useful, if you have any questions or would like to learn more, you can contact me here.
Matt
Sources
NHS. Alcohol use disorder. Last reviewed 24 April 2026.
NHS. Alcohol support. Last reviewed 17 August 2026.
Department of Health and Social Care. UK clinical guidelines for alcohol treatment, chapter 8: harm reduction. Updated 17 April 2026.
Department of Health and Social Care. UK clinical guidelines for alcohol treatment, chapter 10: pharmacological interventions. Updated 17 April 2026.
NICE. Alcohol-use disorders: diagnosis and management of physical complications (CG100).
Drinkaware. Alcohol withdrawal. Last reviewed 3 April 2025.
Alcohol Change UK. Worried about your drinking? Get help.
Sinclair JD. Evidence about the use of naltrexone and for different ways of using it in the treatment of alcoholism. Alcohol and Alcoholism, 2001; 36(1): 2 to 10.
Heinälä P and others. Targeted use of naltrexone without prior detoxification in the treatment of alcohol dependence. Journal of Clinical Psychopharmacology, 2001; 21(3): 287 to 292.
Kranzler HR and others. Targeted naltrexone for problem drinkers. Journal of Clinical Psychopharmacology, 2009; 29(4): 350 to 357.
Rösner S and others. Opioid antagonists for alcohol dependence. Cochrane Database of Systematic Reviews, 2010, issue 12.
