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Disulfiram moa and alcohol interaction

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disulfiram mechanism of action aldehyde dehydrogenase inhibition

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disulfiram alcohol reaction acetaldehyde toxicity clinical features

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Disulfiram: Mechanism of Action & Alcohol Interaction

Mechanism of Action

Disulfiram is an aldehyde dehydrogenase (ALDH) inhibitor. It works by irreversibly blocking ALDH, the enzyme responsible for the second step of alcohol metabolism:
Ethanol → (alcohol dehydrogenase) → Acetaldehyde → (ALDH) → Acetate
                                                      ↑
                                               BLOCKED by Disulfiram
By inhibiting ALDH, disulfiram causes acetaldehyde to accumulate in the blood when alcohol is consumed. Acetaldehyde is toxic and is responsible for all the unpleasant effects of the disulfiram-alcohol reaction (DAR).
  • Typical clinical dose: 250 mg/day (lower, to avoid side effects); the more effective dose is 500 mg/day
  • The enzyme inhibition is irreversible — effects persist for up to 2 weeks after the last dose, as new ALDH must be synthesized

The Disulfiram-Alcohol Reaction

When alcohol is ingested while on disulfiram, rapidly rising acetaldehyde levels produce a characteristic toxic reaction (Harrison's, p. 12929):
SystemSymptoms
GINausea, vomiting
CardiovascularFlushing, tachycardia, hypotension, palpitations
AutonomicDiaphoresis, autonomic instability
NeurologicalHeadache, dizziness, weakness
Severe casesArrhythmia, myocardial infarction, respiratory depression, death
The reaction can begin within 5–10 minutes of alcohol ingestion and may last 30 minutes to several hours depending on the amount of alcohol consumed.

High-Risk Patients

The DAR is particularly dangerous in patients with (Harrison's, p. 12929):
  • Heart disease
  • Stroke history
  • Diabetes mellitus
  • Hypertension

Adverse Effects of Disulfiram Itself (Independent of Alcohol)

  • Transient depressive or psychotic symptoms
  • Peripheral neuropathy
  • Hepatotoxicity (liver damage)
  • Sedation, metallic/garlic taste

Clinical Use

  • Used in alcohol use disorder (AUD) as aversion therapy
  • Works best when administered under supervision (e.g., by a spouse), particularly during high-risk situations (Harrison's, p. 12929)
  • Patients must avoid all alcohol-containing products — including mouthwash, cough syrups, cooking wine, and topical preparations — as even small amounts can trigger the reaction
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