Disulfiram
In brief
- Disulfiram is sold by Pharmacy London in two tablet strengths, 250mg (30 to 360 tablets) and 500mg (30 to 180), and orders reach UK addresses within 9–21 days.
- It blocks the liver enzyme aldehyde dehydrogenase, so even a small amount of alcohol causes acetaldehyde to build up and triggers an unpleasant reaction that acts as a strong deterrent.
- Neither strength matches the 200 mg tablet licensed in the UK, so the dose should always be set by a doctor experienced in treating alcohol dependence.
- The first dose is taken at least 24 hours after the last drink; check labels carefully, as cough syrups, mouthwashes and alcohol-based gels can trigger symptoms for up to two weeks after stopping.
- People with heart disease, a past stroke or severe mental illness are not usually given it, and liver tests are often done before and during use; it is prescription-only in Britain.
Legal status and availability in the UK
Disulfiram is a prescription-only medicine (POM) in the UK, used for alcohol dependence rather than self-treatment.
In our online pharmacy, disulfiram is available without a prescription, with discreet delivery to the United Kingdom in 9–21 days.
Basic disulfiram information
- INN (international nonproprietary name): Disulfiram (also known as N,N,N',N'-tetraethylthiuram disulfide)
- Brand names available in the United Kingdom: Antabuse
- ATC code: N07BB01
- Forms and strengths: tablets (Antabuse 200 mg tablets in the UK)
- Manufacturers in the United Kingdom: not specified
- Registration status in the United Kingdom: prescription-only
- OTC / Rx classification: prescription-only, no OTC sales
Clinical effectiveness in the United Kingdom
Does disulfiram actually help people stop drinking in real life, not just in a leaflet?
It can, especially when the treatment plan is clear and there is proper supervision.
In NHS alcohol treatment and private addiction pathways, disulfiram is usually reserved for people who want abstinence and understand the reaction risk if alcohol is taken.
The best candidates are patients with reliable support, a strong wish to remain alcohol-free, and enough routine in daily life to take the tablets as prescribed.
What improves effectiveness is easy to summarise.
- Clear commitment to alcohol abstinence.
- Observed or supported dosing from a partner, family member, clinic, or pharmacy.
- Good understanding of the disulfiram alcohol reaction.
- Regular follow-up in NHS alcohol treatment.
- Psychosocial support rather than tablets alone.
Supervised dosing generally works better than unsupervised use, because missed doses quickly reduce protection and confidence.
Common UK barriers include forgotten doses, reluctance to stay on treatment for months, and anxiety about the reaction itself.
Many patients also benefit from pharmacist counselling, because a straightforward explanation often reduces fear and helps them avoid trigger situations such as social drinking and hidden alcohol in everyday products.
Indications and expanded uses
What is disulfiram actually for, and what is it not for?
The main MHRA-approved indication is chronic alcohol dependence.
It is an alcohol deterrent medication, not a general detox medicine, and it is not usually used for acute withdrawal.
- Approved use
- Chronic alcohol use disorder, as part of a medically supervised programme.
- Off-label use
- Only specialist decisions outside routine NHS practice, and not a standard first choice.
- Not recommended
- Use as a stand-alone detox treatment or for anyone unable to avoid alcohol exposure.
Disulfiram has the ATC code N07BB01, and it is prescription-only in the UK.
In practice, the medicine is used in a medically supervised programme where abstinence support, review appointments, and safety checks are built in from the start.
Composition and brand landscape
What is in the tablet?
The active ingredient is disulfiram, chemically known as N,N,N',N'-tetraethylthiuram disulfide.
Antabuse is the brand available in the UK, supplied as 200 mg tablets.
Contraindications and special precautions
Who should avoid disulfiram, and when is extra caution needed?
This is where safe prescribing really matters, because the alcohol reaction and liver effects are not trivial.
| Contraindication | Reason | Action |
|---|---|---|
| Hypersensitivity to disulfiram or thiuram derivatives | Risk of allergic reaction | Do not use |
| Severe hepatic impairment | Higher risk of hepatotoxicity | Avoid treatment |
| Severe renal impairment | Reduced safety margin | Avoid treatment |
| Alcohol taken within the past 24 hours | Severe disulfiram reaction risk | Delay until alcohol-free |
| Psychosis or severe cardiovascular disease | Potential worsening of symptoms or reaction risk | Do not use |
Pregnancy and breastfeeding are risk-benefit decisions rather than routine use cases.
Daily-life precautions matter too, especially for older adults, people with diabetes, epilepsy, or mild liver dysfunction.
- Check hidden alcohol in cough mixtures, mouthwashes, and tonics.
- Be cautious with driving if sleepy or unwell.
- Avoid alcohol-free products that still contain trace alcohol.
- Tell clinicians about cardiovascular disease, seizures, and diabetes.
- Ask about hidden alcohol in over-the-counter medicines before starting anything new.
Dosage guidelines
How is disulfiram usually started in the UK?
The standard approach is a short higher-dose start, followed by a lower maintenance dose that keeps the deterrent effect going.
| Phase | Dose | Monitoring |
|---|---|---|
| Initial phase | 800 mg on the first day, reduced over 5 days | Check tolerability, alcohol avoidance, and baseline liver function |
| Maintenance phase | 100–200 mg once daily | Adjust to effect and side effects, with clinician review |
| Ongoing treatment | Often continued for months | Follow-up and liver monitoring |
The usual treatment duration is 3 to 12 months, and longer courses may be used in selected patients if relapse risk stays high.
Children and adolescents are not recommended because safety and efficacy are not established.
Elderly patients may need a lower starting dose, and liver or renal impairment requires caution.
If a dose is missed, take it as soon as remembered unless the next dose is close, then skip it and resume the normal schedule; do not double up.
Interactions overview
Can one drink really matter on disulfiram?
Yes, and that is the whole point of the treatment.
Any alcohol exposure can trigger a disulfiram-ethanol reaction, including drinks, cooking alcohol, some mouthwashes, and alcohol-containing medicines.
Patients in the UK are often surprised by hidden alcohol in cough syrups and tonics, so pharmacist counselling is important.
- Beer, wine, spirits, and sherry.
- Mouthwashes and oral rinses with alcohol.
- Cough syrups, tonics, and some over-the-counter remedies.
- Culinary alcohol in sauces and desserts.
- Topical or medicinal products that contain alcohol.
| Interaction | Risk | Advice |
|---|---|---|
| Alcohol of any kind | Severe reaction | Avoid completely |
| Alcohol-containing medicines | Unexpected exposure | Check labels and ask a pharmacist |
| Prescription medicines | Possible added side effects or monitoring issues | Tell the prescriber about every medicine |
| Adverse effects | Safety reporting needed | Use MHRA Yellow Card reporting where appropriate |
Tea and coffee are not the main issue, so patients can usually be reassured on that point.
The real risk is alcohol exposure, not ordinary hot drinks.
Comparable medicines and preferences
Which medicine is best depends on the goal of treatment, liver health, and how likely the person is to take tablets every day.
Disulfiram is often the best fit for highly motivated patients who want a clear deterrent to drinking.
Other medicines may be better where craving reduction, liver safety, or less supervision is the priority.
| Medicine | Main benefit | Main limitation |
|---|---|---|
| Disulfiram | Strong deterrent to alcohol use | Requires strict avoidance of alcohol and good adherence |
| Naltrexone | Useful for reducing drinking and relapse risk | Not the same deterrent effect |
| Acamprosate | Supports abstinence maintenance | Different adherence demands and no deterrent reaction |
| Baclofen | Sometimes used in specialist settings | Off-label use |
| Topiramate | May help some patients in specialist care | Not licensed for alcohol dependence in the UK |
Frequently asked questions
How long after stopping alcohol can I take disulfiram?
At least 24 hours must have passed since the last alcohol intake.
Can I buy Antabuse in the UK without a prescription?
No, disulfiram is prescription-only in the UK.
What happens if I drink on disulfiram?
A severe disulfiram alcohol reaction can occur, so any alcohol exposure must be avoided.
Do I need liver tests?
Yes, liver monitoring is part of safe use, especially at the start and during follow-up.
Delivery across the United Kingdom
| City | Region | Delivery time |
|---|---|---|
| London | England | 9–21 days |
| Birmingham | England | 9–21 days |
| Manchester | England | 9–21 days |
| Leeds | England | 9–21 days |
| Glasgow | Scotland | 9–21 days |
| Edinburgh | Scotland | 9–21 days |
| Liverpool | England | 9–21 days |
| Bristol | England | 9–21 days |
| Sheffield | England | 9–21 days |
| Newcastle upon Tyne | England | 9–21 days |
| Cardiff | Wales | 9–21 days |
| Belfast | Northern Ireland | 9–21 days |
| Nottingham | England | 9–21 days |
| Aberdeen | Scotland | 9–21 days |
Guidelines for proper use
What should patients actually do once disulfiram has been started?
The safest advice is simple: take exactly as prescribed, avoid all alcohol sources, and stay in touch with the prescriber.
| What to do | Why it matters |
|---|---|
| Take the tablet at the same time each day | Supports adherence and makes supervision easier |
| Keep clear of alcohol in drinks, medicines, and mouth products | Prevents a disulfiram reaction |
| Attend liver monitoring | Helps detect transaminase changes early |
| Tell clinicians about all medicines | Reduces interaction and safety problems |
| Keep a dose and side-effect record | Makes review appointments more useful |
- Use NHS patient portals or GP messaging for refills and reminders.
- Ask a community pharmacist before using any new over-the-counter product.
- Store tablets at room temperature, protected from moisture and light.
- Avoid excess heat and humidity during travel.
- Seek help promptly if overdose is suspected or severe side effects appear.
Disulfiram works best as part of a structured programme with behavioural support, not as a standalone solution.
