Disulfiram like reaction causing druggs
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Disulfiram-Like Reaction: Mechanism and Causative Drugs
Mechanism: A disulfiram-like (Antabuse-like) reaction occurs when a drug inhibits aldehyde dehydrogenase, the enzyme that normally breaks down acetaldehyde (the toxic intermediate of alcohol metabolism). When ethanol is consumed while aldehyde dehydrogenase is blocked, acetaldehyde accumulates, producing flushing, throbbing headache, nausea/vomiting, tachycardia, hypotension, sweating, and dyspnea - sometimes severe enough to cause chest pain or circulatory collapse (Katzung's Basic and Clinical Pharmacology, 16th ed., p. 428).
Drugs that can produce a disulfiram-like reaction with alcohol
| Drug/Agent | Notes on evidence |
|---|---|
| Disulfiram itself | Proven [P] - irreversibly inhibits aldehyde dehydrogenase |
| Metronidazole / Tinidazole | Long-reported [NP - mechanism not firmly established]; patients are counseled to avoid alcohol for 24h (metronidazole) to 72h (tinidazole) after therapy. Newer evidence is mixed - some case-control data question whether metronidazole truly causes this (see PMID 37494646, 41366815) |
| Certain cephalosporins | Cefamandole, cefoperazone, cefotetan, moxalactam, and case reports of cefmetazole (PMID 39247452) |
| Chloral hydrate | Mechanism not established |
| Sulfonylureas, especially chlorpropamide | Older-generation agent most implicated |
| Griseofulvin | Antifungal |
| Certain herbal/traditional agents | e.g., Ginaton (Ginkgo biloba extract) reported in a 2023 case report/review |
| Vaping/nicotine + metronidazole interaction | Recently reported case (2026, PMID 41577777) |
| Coprinus atramentarius (mushroom) and other non-drug agents (carbon disulfide, thiuram herbicides, trichloroethylene) | Non-pharmaceutical causes with the same mechanism |
(Katzung's Basic and Clinical Pharmacology, p. 1330; Goldman-Cecil Medicine, Dermatologic Signs; Goodman & Gilman's Pharmacological Basis of Therapeutics, p. 1379; Washington Manual of Medical Therapeutics, p. 544)
Clinical notes
- With cephalosporins, the risk relates to the methyltetrazolethiol (MTT) side chain present in cefamandole, cefoperazone, cefotetan, and moxalactam - not all cephalosporins carry this risk.
- Metronidazole/disulfiram co-administration itself can precipitate psychosis and should generally be avoided (Dermatology, 2-Volume Set, 5e).
- Evidence quality varies: some "classic" associations (chlorpropamide, chloral hydrate, metronidazole) are based on older case reports without a firmly established mechanism ([NP]/[NE] in Katzung's interaction tables), and recent controlled data (PMID 37494646, 41366815) have questioned whether metronidazole truly causes this reaction at all - worth flagging as an area of ongoing debate rather than settled fact.
Recent literature flag: A 2025 review ("Revisiting the Disulfiram-Like Reaction Between Alcohol and Oral Metronidazole," PMID 41366815) and a 2023 case-control study (PMID 37494646) both question the classic teaching that metronidazole causes a true disulfiram-like reaction, suggesting the historical association may be weaker than textbooks state - useful context if counseling patients based on this mechanism.
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