Disulfiram (Antabuse)

What it treats

Disulfiram is approved by the U.S. Food and Drug Administration as an aid in the management of selected patients with chronic alcohol use disorder who want to remain abstinent. It's a deterrent, not a treatment for craving or reward. The label is explicit: this drug is for people who want it, who understand what will happen if they drink, and who have a support system that can help hold the plan.

Guidelines usually place it after naltrexone and acamprosate as a second- or third-line option. It works well for a specific kind of person: someone who wants a hard external stop between them and drinking, and who has help with observed dosing or a partner who supports the plan.

How it works

Alcohol is broken down in two steps. First, it turns into acetaldehyde (the toxic middle metabolite), then acetaldehyde is broken down by an enzyme called aldehyde dehydrogenase into harmless acetate. Disulfiram blocks that second enzyme. When someone on disulfiram drinks, acetaldehyde builds up, and that's what causes the reaction: flushing, throbbing headache, nausea and vomiting, palpitations, sweating, sometimes hypotension.

The reaction can start within 10 to 30 minutes of drinking and can last for several hours. Even small amounts of alcohol can trigger it. So can hidden sources: some mouthwashes, cough syrups, sauces cooked with wine, cologne or aftershave through the skin, and some fermented foods.

Receptor mechanism (detail)

Disulfiram irreversibly inhibits aldehyde dehydrogenase (ALDH), causing acetaldehyde accumulation when alcohol is consumed. It also inhibits dopamine β-hydroxylase, which can contribute to some of its neuropsychiatric side effects. Because ALDH inhibition is irreversible, the effect persists for up to 2 weeks after the last dose while the body makes new enzyme.

Potency and typical dosing pattern

Ranges are typical framework only, not a prescription for any individual.

The usual dose is 250 mg by mouth once daily, with a range of 250 to 500 mg. Some clinicians start at 500 mg for the first week or two and drop to 250 mg for maintenance. Doses above 500 mg aren't recommended.

Disulfiram is taken on a day when no alcohol has been consumed for at least 12 hours. Starting it while alcohol is still on board triggers exactly the reaction the drug is designed for.

The medication doesn't need to be dosed multiple times per day. Once-daily is standard. Some programs use observed dosing (a partner, a pharmacy, or a clinic) because adherence is the whole game.

Safety monitoring

• Liver function tests (LFTs) at baseline and periodically. Disulfiram carries an FDA boxed warning for hepatotoxicity, including rare fatal cases. Any new right-upper-quadrant pain, jaundice, dark urine, or unexplained fatigue needs prompt evaluation.
• Patient consent and understanding. This drug depends on the patient being on board. Give it without consent and you have a medical and ethical problem, not a treatment plan.
• Counseling about hidden alcohol. Mouthwash, cough syrup, sauces, fermented foods, cologne, aftershave, hand sanitizer used heavily on broken skin.
• Cardiovascular status. The reaction stresses the cardiovascular system. Significant coronary disease, recent MI, or severe heart failure are contraindications.
• Psychiatric status. Psychosis, severe depression, and cognitive impairment that would prevent understanding the risk are contraindications.
• Peripheral neuropathy and optic neuritis. Rare but reported with longer use.

What to expect

Common side effects

On the medication without alcohol:

• Drowsiness or fatigue.
• Metallic or garlic-like aftertaste.
• Mild headache.
• Acne-like rash.
• Impotence in some men.

With alcohol (the deterrent reaction):

• Flushing, throbbing headache, nausea, vomiting.
• Palpitations, sweating.
• Weakness, blurred vision.
• Chest discomfort, hypotension.

Serious side effects and warnings

• Hepatotoxicity (boxed warning). Rare but serious liver injury, including fatal hepatitis, has been reported. Baseline and periodic LFTs. Stop for symptoms of liver injury or a meaningful rise in enzymes.
• Severe disulfiram-alcohol reaction. Arrhythmia, MI, seizure, respiratory depression, and cardiovascular collapse have been reported, especially with larger amounts of alcohol.
• Psychosis. Rare, more likely at higher doses or in people with underlying psychotic illness.
• Peripheral neuropathy and optic neuritis. Uncommon and usually reversible with stopping.
• Interactions with metronidazole and other agents that produce a disulfiram-like reaction can be dangerous.

Sexual and relational effects

Impotence has been reported in some men on disulfiram, and low libido is possible. The bigger relational picture is that disulfiram often becomes a family and partner conversation: who watches the dose being taken, who holds the pill bottle, who supports the plan. That structure is part of what makes the drug work. It can also feel intrusive, and that tension is worth naming out loud with the person in your life.

Weight, appetite, and sleep

Weight change on disulfiram is usually modest. Fatigue in the first weeks is common and often settles. Sleep is generally not disturbed.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual.

Disulfiram is started after alcohol has been stopped for at least 12 hours (some sources say 24). The usual dose is 250 mg once daily, with a range of 250 to 500 mg. Taking it at the same time each day, often with a routine like a partner watching, is standard. Observed dosing (spouse, sponsor, pharmacy, or clinic) is one of the strongest predictors of the drug actually working.

A baseline LFT panel and a review of hidden alcohol sources with the patient are standard first-visit tasks.

Missed doses and interactions

If a dose is missed, take it when remembered on the same day. Don't double up. Because the enzyme block persists, a single missed dose doesn't leave someone unprotected the next day; the effect lingers for up to 2 weeks after stopping.

Interactions that matter:

• Metronidazole and tinidazole. Can cause acute psychosis and confusional states. Avoid.
• Warfarin. Disulfiram raises INR. Watch closely.
• Phenytoin. Levels can rise.
• Isoniazid. Neurologic side effects can be worse.
• Any alcohol-containing product. Cough syrup, mouthwash, sauces, some IV medications, some topical products used heavily on broken skin.

Give every prescriber a full medication list, including OTC and topical products.

Stopping and tapering

Disulfiram doesn't cause physical dependence and there's no medical withdrawal from stopping. The enzyme block lasts up to 2 weeks after the last dose. Drinking during that window still triggers a reaction, sometimes weaker.

Reasons to stop include intolerable side effects, hepatotoxicity, a change in plan, or a life event where a reaction would be unsafe (planned surgery with alcohol-containing preparations, for example). Any restart later is a fresh conversation with the prescriber.

Pregnancy and breastfeeding

Data on disulfiram in pregnancy is limited, and it is generally avoided. Anyone who is pregnant, planning a pregnancy, or breastfeeding should talk it through with a prescriber, weighing the risks of continued drinking against those of the medication.

Cost and generic availability

Disulfiram has been generic for many years and is inexpensive. Insurance coverage is generally straightforward.

Common questions

Will one sip of wine really do it? Small amounts of alcohol can trigger a reaction, and hidden sources (sauces, mouthwash, cough syrup) can too. The severity depends on how much and on the individual. It isn't worth testing.

How long does the effect last after I stop? Up to about 2 weeks. Drinking during that window can still cause a reaction.

Can I take it without my family knowing? No. Giving it without the patient's knowledge is unsafe and against the label. And practically, the drug only works when the person taking it is on board.

Is it addictive? No. Disulfiram isn't psychoactive and isn't controlled.

What if I have liver disease? Existing liver disease raises the risk. Baseline LFTs and a careful conversation with the prescriber are standard. In severe liver disease, disulfiram is usually not the right choice.

Questions to ask your prescriber

• Is this the right medication for me given my other conditions?
• What are the hidden sources of alcohol I need to know about?
• How will we track liver function?
• What's the plan if I slip and drink on it?
• Who in my life should know I'm on this?

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes, and current as of June 8, 2026.

• U.S. Food and Drug Administration. Disulfiram (Antabuse) prescribing information, including boxed warning for hepatotoxicity.
• MedlinePlus, U.S. National Library of Medicine. Disulfiram.
• DailyMed, U.S. National Library of Medicine. Disulfiram tablets.
• American Society of Addiction Medicine. Clinical Practice Guideline on Alcohol Use Disorder.
• National Institute on Alcohol Abuse and Alcoholism. Treatment for alcohol problems.