What are common side effects of metronidazole, and when should alcohol be avoided?

What are common side effects of metronidazole, and when should alcohol be avoided?

• A. Metallic taste and GI upset; avoid alcohol during therapy and 24-72 hours after.
• B. Headache and rash; avoid alcohol only during therapy.
• C. Dizziness and tachycardia; avoid dairy.
• D. Nausea and dizziness; avoid caffeine.

Answer: (A)

The key idea is recognizing the typical adverse effects of metronidazole and its interaction with alcohol. Metronidazole commonly causes a metallic taste and GI upset, which patients often notice soon after starting therapy. It also can trigger a disulfiram-like reaction with alcohol, so it’s important to avoid alcohol during treatment and for about 24 to 72 hours after finishing, to prevent symptoms like flushing, nausea, and palpitations. This combination—metallic taste with GI upset and a clear alcohol-avoidance window during therapy plus 24–72 hours after—best reflects both the common side effects and the drug-alcohol interaction. Other choices mention less characteristic effects or relate to substances (like dairy or caffeine) that aren’t specifically relevant to metronidazole’s adverse effect profile or its disulfiram-like reaction.

The key idea is recognizing the typical adverse effects of metronidazole and its interaction with alcohol. Metronidazole commonly causes a metallic taste and GI upset, which patients often notice soon after starting therapy. It also can trigger a disulfiram-like reaction with alcohol, so it’s important to avoid alcohol during treatment and for about 24 to 72 hours after finishing, to prevent symptoms like flushing, nausea, and palpitations.

This combination—metallic taste with GI upset and a clear alcohol-avoidance window during therapy plus 24–72 hours after—best reflects both the common side effects and the drug-alcohol interaction. Other choices mention less characteristic effects or relate to substances (like dairy or caffeine) that aren’t specifically relevant to metronidazole’s adverse effect profile or its disulfiram-like reaction.