Updated: January 25, 2026

What Is Disulfiram? Uses, Dosage, and What You Need to Know in 2026

Author

Peter Daggett

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What Is Disulfiram Used For?
How Does Disulfiram Work?
What Are the Dosage Forms and Strengths?
How Is Disulfiram Taken? (Dosing Instructions)
Who Should NOT Take Disulfiram?
Is Disulfiram a Controlled Substance?
Finding Disulfiram in 2026

Disulfiram (formerly Antabuse) is an FDA-approved prescription medication for alcohol use disorder. Here's everything you need to know about what it is, how it works, and its dosing.

Disulfiram is a prescription medication used to support recovery in people with alcohol use disorder (AUD). It has been FDA-approved since 1951 — making it one of the longest-standing pharmacological treatments for alcoholism in history. While the brand name Antabuse has been discontinued, generic disulfiram remains available.

Here's a complete, plain-language guide to disulfiram: what it is, why it's prescribed, how it's taken, and what you need to know before starting it.

What Is Disulfiram Used For?

Disulfiram is FDA-approved for the management of chronic alcohol dependence in motivated patients who want to remain sober. It is not a cure for alcoholism, and it works best as part of a comprehensive treatment program that includes counseling, behavioral therapy, and strong social support.

Disulfiram is one of three FDA-approved medications for AUD — the other two being naltrexone (approved 1994) and acamprosate (approved 2004). Disulfiram is classified as a second-line treatment. Naltrexone and acamprosate are considered first-line by the APA 2018 guidelines because they have fewer safety concerns and don't require the same level of supervised patient selection.

How Does Disulfiram Work?

Disulfiram works by blocking an enzyme called aldehyde dehydrogenase (ALDH2), which the body uses to break down alcohol. Normally, alcohol is converted to acetaldehyde (toxic), then quickly converted to acetic acid (harmless). Disulfiram stops that second step — causing acetaldehyde to accumulate in the blood at 5-10 times the normal level.

The buildup of acetaldehyde causes the disulfiram-alcohol reaction (DAR): flushing, nausea, vomiting, rapid heartbeat, dizziness, and difficulty breathing — within 10-30 minutes of consuming alcohol. This highly unpleasant reaction is the entire point: it makes drinking alcohol deeply aversive, helping patients stay sober.

What Are the Dosage Forms and Strengths?

Disulfiram is available only as an oral tablet in two strengths:

250 mg tablets — most commonly prescribed maintenance dose
500 mg tablets — used during the initial loading phase or for patients needing a higher maintenance dose

Tablets can be crushed and mixed with liquid if swallowing is a concern.

How Is Disulfiram Taken? (Dosing Instructions)

Before starting: You must abstain from alcohol for at least 12 hours before your first dose.
Initial phase: Up to 500 mg once daily for 1-2 weeks.
Maintenance phase: Average 250 mg/day (range 125-500 mg); do not exceed 500 mg/day.
Timing: Usually taken in the morning. If it causes drowsiness, take at bedtime.
Duration: Disulfiram can be taken for months or years. Its effects persist for up to 14 days after stopping — meaning you must not drink for at least 2 weeks after your last dose.

Who Should NOT Take Disulfiram?

Disulfiram is not appropriate for everyone. It should NOT be used in patients with:

Severe heart disease or coronary artery disease
Active psychosis or severe psychiatric illness
Allergy to disulfiram or thiuram derivatives (found in some pesticides and rubber products)
Current use of metronidazole (Flagyl) or paraldehyde
Patients who are not fully informed and consenting to treatment

Is Disulfiram a Controlled Substance?

No. Disulfiram is not classified as a controlled substance under the DEA Controlled Substances Act. It is a prescription-only (Rx) medication, meaning you need a valid prescription from a licensed provider, but it does not have DEA scheduling restrictions. This means prescribers do not need a special DEA license to prescribe it, and pharmacies do not face the same dispensing limitations that apply to controlled substances.

Finding Disulfiram in 2026

There is an active shortage of certain disulfiram presentations as of 2026. If you're having trouble filling your prescription, medfinder can help — it contacts pharmacies near you to find which ones have disulfiram in stock and texts you the results.

Want to learn more about what to watch for once you start disulfiram? Read our guide on disulfiram side effects: what to expect and when to call your doctor.

Frequently Asked Questions

Yes. Antabuse was the brand name for disulfiram. The brand was discontinued by its manufacturer, but the generic drug — disulfiram — contains the same active ingredient, is therapeutically equivalent, and is still available from multiple generic manufacturers. If you have a prescription for Antabuse, your pharmacist can fill it with generic disulfiram.

Disulfiram reaches therapeutic levels in the body within a day or two of starting. However, the disulfiram-alcohol reaction can occur from your very first dose onward — that's why you must abstain from alcohol for at least 12 hours before your first dose. The aversion deterrent effect is essentially immediate once adequate levels are established.

Not immediately. Disulfiram is eliminated slowly from the body and can cause the disulfiram-alcohol reaction for up to 14 days after your last dose. You should avoid all alcohol (including hidden sources in foods, medications, and personal care products) for at least two weeks after stopping disulfiram. After that window, the aversion effect is gone.

Disulfiram is an aversion agent — it works by punishing alcohol use with unpleasant physical reactions. Naltrexone reduces the pleasure and cravings associated with drinking by blocking opioid receptors. Acamprosate reduces the anxiety and discomfort of staying sober by modulating GABA and glutamate systems. Naltrexone and acamprosate are first-line treatments; disulfiram is second-line and requires more careful patient selection.

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