Disulfiram

What Is Disulfiram?

Disulfiram is a prescription medication that belongs to a class of drugs called alcohol deterrents (aldehyde dehydrogenase inhibitors). It works by producing a highly unpleasant physical reaction when alcohol is consumed, helping to discourage drinking.

Approved use:

• Management of alcohol dependence (alcohol use disorder) in selected, highly motivated patients, used together with counseling, psychotherapy, and other supportive treatment

Available formulation:

• Oral tablets (Disulfiram 250mg)

Disulfiram is not a treatment that reduces cravings or urges to drink. Instead, it works as a deterrent by making alcohol consumption physically unpleasant, and it is most effective when combined with a broader treatment and support plan.

What Is the Recommended Dosage of Disulfiram?

Dosage depends on several factors, including:

• Individual response and tolerability
• Liver function, since disulfiram is processed by the liver and carries specific liver-related risks
• Whether the patient has fully abstained from alcohol before starting — treatment must not begin until the patient has not consumed alcohol for at least 12 hours
• Ongoing monitoring and treatment goals, since maintenance dosing is adjusted based on response over time

Available dosage form: oral tablets, generally taken once daily.

Treatment is typically started at a lower dose and then adjusted upward over the following days to a maintenance dose, which may continue for months or years depending on the treatment plan. Because starting and adjusting disulfiram requires careful medical supervision — including a physical examination and full patient understanding of the disulfiram-alcohol reaction before the first dose — dosing must always follow the specific plan set by the prescribing specialist.

How Disulfiram Works

Disulfiram works by blocking an enzyme called aldehyde dehydrogenase, which the body normally uses to break down alcohol.

• When alcohol is blocked from being fully processed, a byproduct called acetaldehyde builds up in the body.
• This buildup causes an unpleasant reaction — including flushing, headache, nausea, vomiting, and a racing heartbeat — within minutes of consuming even a small amount of alcohol.
• This reaction is intended to create a strong deterrent against drinking while the medication is active in the body.

Disulfiram supports abstinence by creating this deterrent effect; it does not reduce alcohol cravings and does not treat the underlying causes of alcohol dependence on its own. It works best as part of a comprehensive treatment plan that includes counseling and behavioral support.

Is a Prescription Required to Buy Disulfiram Online?

Yes. Disulfiram is available only by prescription.

• Treatment should be initiated by a physician or addiction medicine specialist, typically after a full physical examination and a clear discussion of the risks involved.
• Because of the seriousness of the disulfiram-alcohol reaction, patients — and often their close family members — need to fully understand how the medication works and the importance of avoiding all forms of alcohol before starting.
• Patients should avoid any online source offering disulfiram without requiring a valid prescription, as such products may be counterfeit or unsafe.
• Only licensed, verified pharmacies should be used to obtain this medication.

Side Effects of Disulfiram

Common Side Effects

• Mild headache
• Fatigue or tiredness
• Metallic or garlic-like taste in the mouth
• Skin rash or acne
• Reduced interest in sex or impotence

Serious Side Effects

• The disulfiram-alcohol reaction — occurring if alcohol is consumed while taking this medication or within about 14 days of stopping it — which can include flushing, throbbing headache, difficulty breathing, chest pain, rapid heartbeat, severe vomiting, low blood pressure, fainting, confusion, and in severe cases, seizures, abnormal heart rhythms, cardiovascular collapse, or death
• Liver damage, including rare cases of serious liver failure — signs include yellowing of the skin or eyes, dark urine, unusual fatigue, loss of appetite, or abdominal pain
• Eye pain or sudden vision changes, which may indicate optic nerve damage
• Nerve damage affecting the hands or feet (peripheral neuropathy)
• Confusion, unusual thoughts, or behavior changes (rare psychotic reactions)

Seek immediate medical attention for symptoms of a disulfiram-alcohol reaction, signs of liver problems, sudden vision changes, or confusion and unusual behavior.

This list is not exhaustive. Report any new or worsening symptoms to a healthcare provider promptly.

Drug Interactions

Disulfiram has several important interactions, including:

• Metronidazole and paraldehyde — should not be used together with disulfiram, as combining these can cause serious reactions
• Alcohol in any form, including alcohol-containing foods, cough syrups, mouthwash, cooking wine, vinegar, certain desserts, and topical products such as lotions or liniments — all of which can trigger the disulfiram-alcohol reaction
• Certain diabetes medications (such as some sulfonylureas), which can cause a disulfiram-like reaction when combined with alcohol
• Blood-thinning medications, since disulfiram may affect how these are processed
• Over-the-counter (OTC) medications and supplements, some of which contain alcohol or may interact with liver metabolism

Patients should give their prescribing specialist and pharmacist a complete list of all medications, OTC products, and supplements — and carefully check ingredient labels for hidden alcohol content — before and during disulfiram treatment.

Safety & Important Considerations

• Liver disease: Disulfiram carries a risk of serious, sometimes fatal, liver damage; regular liver function monitoring is often recommended, and disulfiram should be used with extreme caution in anyone with liver impairment.
• Kidney disease: Should be discussed with the prescribing specialist, as specific dosing guidance may be limited.
• Pregnancy: Use during pregnancy should only occur if a specialist determines that the benefits outweigh potential risks.
• Breastfeeding: Should be discussed directly with the prescribing specialist.
• Cardiovascular disease: Because the disulfiram-alcohol reaction can affect the heart, patients with underlying heart disease require careful evaluation before starting treatment.
• Full patient understanding required: Disulfiram must never be given to someone without their full knowledge and consent, or while they are currently intoxicated.
• Monitoring requirements: Periodic liver function tests and clinical follow-up are typically part of ongoing treatment.
• Duration of risk after stopping: The disulfiram-alcohol reaction can still occur for up to about 14 days after the last dose, so alcohol must continue to be avoided during this period.

This information is not exhaustive. Any personal risk factors, especially related to liver or heart health, should be discussed directly with the prescribing specialist.

Who This Medication Is For

Disulfiram is generally prescribed for:

• Adults with a diagnosis of alcohol dependence (alcohol use disorder) who are highly motivated to stop drinking
• Patients who are able to fully understand the risks of the disulfiram-alcohol reaction and commit to complete alcohol avoidance
• Patients participating in a broader treatment plan that includes counseling, psychotherapy, or other supportive treatment

Who Should Not Take Disulfiram

Disulfiram should not be used by individuals who:

• Are currently intoxicated with alcohol
• Have recently used alcohol (within the last 12 hours or longer, as directed)
• Have a known hypersensitivity to disulfiram or similar compounds
• Are taking metronidazole or paraldehyde
• Have severe heart disease, unless specifically evaluated and approved by a specialist
• Have significant liver disease, without careful specialist evaluation

Additional caution is needed for patients with a history of psychosis, seizure disorders, or nerve-related conditions.

A full medical history should always be reviewed by the prescribing specialist before starting disulfiram, and patients should never begin treatment without complete understanding of the risks involved.

What to Do If You Miss a Dose

• If a dose of disulfiram is missed, contact the prescribing specialist or pharmacist for specific guidance, as consistency is important for this medication to remain effective as a deterrent.
• Do not take a double dose to make up for a missed one unless specifically instructed to do so.
• If unsure what to do, do not guess — reach out to the care team before taking any additional medication.
• Missing doses can reduce the deterrent effect, so any pattern of missed doses should be discussed with the prescribing specialist as part of the overall treatment plan.

Related medications to Disulfiram

Disulfiram is used within alcohol-dependence treatment through a mechanism different from other medicines in this treatment area. Related pages include Acamprosate and Naltrexone. These medicines have different treatment goals, contraindications, and safety requirements.

Storage Instructions

• Store tablets at room temperature, protected from excess heat and moisture.
• Keep in the original, tightly closed container, away from direct light.
• Keep out of the reach and sight of children and pets.
• Do not use expired medication; consult a pharmacist with any disposal questions.

Disclaimer:

This page is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Patients must consult a licensed medical specialist — such as a physician or addiction medicine specialist — before starting, changing, or stopping disulfiram. Treatment decisions must be based on a full clinical evaluation by a qualified specialist.