Metronidazole is a commonly used antibiotic for the treatment of variety infections, where anaerobic bacteria are suspected to be a causative organism. Some common infections treated with metronidazole are acute dental infections, rosacea, and bacterial vaginosis. One of the warnings on the dispensing label for this antibiotic include interaction between metronidazole and alcohol. This warning states: Do not drink alcohol while taking this medication. What is the reason for metronidazole & alcohol warning?