Disulfiram
Medication that induces severe alcohol intolerance to treat alcoholism.
Wikipedia / Wikimedia Commons
Disulfiram is a drug prescribed to help manage chronic alcoholism by making the body react badly to alcohol. It blocks the enzyme aldehyde dehydrogenase (specifically ALDH2), so that even a small amount of alcohol triggers immediate hangover-like symptoms. These can include facial flushing, throbbing in the head and neck, headache, trouble breathing, nausea, heavy vomiting, sweating, thirst, chest pain, palpitations, shortness of breath, hyperventilation, rapid heart rate, low blood pressure, fainting, severe unease, weakness, vertigo, blurred vision, and confusion. In severe cases, the reaction may lead to respiratory depression, cardiovascular collapse, abnormal heart rhythms, heart attack, acute congestive heart failure, unconsciousness, seizures, and death.
Normally, the body breaks down alcohol into acetaldehyde, which is then processed by ALDH2 into a harmless substance. Disulfiram (through its metabolites, especially diethylthiomethylcarbamate) stops this second step, causing acetaldehyde to build up to levels five to ten times higher than usual. This buildup creates the unpleasant effects. The drug’s action mimics a common genetic condition—ALDH2 deficiency—found in about 540 million people of East Asian ancestry due to the ALDH2*2 allele. Reduced ALDH2 activity also occurs in about 120 million people of non-East Asian descent, though less frequently.
Disulfiram is a second-line treatment for alcohol dependence, after acamprosate and naltrexone. It does not reduce cravings for alcohol, so compliance is often poor. Methods to improve adherence include subdermal implants that release the drug for up to 12 weeks, or supervised administration—for example, by a spouse or pharmacist. If alcohol has been consumed in the last 12 hours, disulfiram should not be taken. The drug has no tolerance effect; the longer it is taken, the stronger its effects. Because it is absorbed and eliminated slowly, the reaction can last up to two weeks after the last dose. Medical ethics require that patients be fully informed about this reaction.
About 5 to 10 minutes after drinking alcohol while on disulfiram, a severe hangover-like reaction begins and lasts from 30 minutes to several hours. Symptoms usually include skin flushing, rapid heart rate, low blood pressure, nausea, and vomiting. Less common effects include shortness of breath, throbbing headache, visual disturban
- field
- Medicine (pharmacology)
- known_for
- Treatment of chronic alcoholism via disulfiram-alcohol reaction
- mechanism
- Inhibits aldehyde dehydrogenase (ALDH2), causing acetaldehyde buildup
- common_side_effects
- Headache, metallic or garlic taste
- serious_side_effects
- Hepatitis (rare), neuropathy, cardiovascular collapse
- prevalence_of_ALDH2_deficiency
- Affects an estimated 540 million people of East Asian ancestry
Lore & Background
Disulfiram is a medication that supports the treatment of chronic alcoholism by producing an acute sensitivity to ethanol. It works by inhibiting the enzyme aldehyde dehydrogenase (specifically ALDH2), causing many of the effects of a hangover to be felt immediately following alcohol consumption. The reaction can include flushing, throbbing headache, respiratory difficulty, nausea, vomiting, sweating, chest pain, palpitation, low blood pressure, fainting, and in severe cases, respiratory depression, cardiovascular collapse, heart attack, unconsciousness, and death.
Reader's Guide
Disulfiram's significance lies in its role as a pharmacological deterrent for alcohol consumption. By blocking the metabolism of acetaldehyde, it creates an immediate and severe negative reaction to alcohol, which can help patients maintain sobriety under supervised administration. However, disulfiram does not reduce alcohol cravings, and compliance is extremely poor without supervision. Modern clinical practice often uses it as a second-line treatment, behind naltrexone and acamprosate. Its effectiveness is highly dependent on supervision, such as by a spouse or pharmacist, and meta-analyses show it has a very small effect on alcohol self-avoidance when taken voluntarily. The drug's safety profile includes rare but serious side effects like hepatitis (estimated incidence 1 per 25,000 to 1 in 30,000) and neuropathy. Disulfiram also disrupts metabolism of other compounds, including paracetamol, theophylline, and caffeine, and is a potent CYP2E1 inhibitor. Its clinical use mimics the genetic ALDH2 deficiency common in East Asian populations, affecting an estimated 540 million people.
Did You Know?
- Disulfiram plus alcohol can produce symptoms within 5 to 10 minutes, lasting from 30 minutes up to several hours.
- The effects of disulfiram may last for up to two weeks after the initial intake.
- Disulfiram is prepared by oxidation of sodium diethyldithiocarbamate.
- The term 'disulfiram effect' refers to an adverse reaction to alcohol caused by other medications, such as metronidazole or certain cephalosporins.
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