Metronidazole alcohol counselling — GPhC CRA MCQ
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Correct answer: D — Avoid alcohol during treatment and for at least 48 hours after the final dose
Avoid alcohol during treatment and for at least 48 hours after the final dose: UK advice retains this precaution because an unpleasant disulfiram-like reaction may occur during treatment and shortly after exposure ends. Alcohol is safe two hours after each dose because metronidazole has already been absorbed: Systemic drug and metabolites persist well beyond the absorption phase. Alcohol is prohibited only when metronidazole is given intravenously: The interaction warning also applies to oral treatment. Switch to once-daily dosing on days when alcohol is planned: Altering the prescribed regimen risks treatment failure and does not remove interaction risk. Avoid alcohol only for 48 hours before the first dose, then drink normally: The relevant exposure period is during treatment and after the final dose.
Reference: BNF: metronidazole: https://bnf.nice.org.uk/drugs/metronidazole/