Under normal circumstances, after taking metronidazole, metabolites will be produced in the body, which will be excreted with urine, making the urine dark red or brown. The urine will return to its normal color after the complete metabolism of metronidazole is eliminated in about 3 days. There is no need to worry too much. Patients taking metronidazole should drink plenty of water while taking the drug to help expel it. At the same time, you should eat a light diet, eat more fresh vegetables and fruits, avoid spicy and stimulating foods, and not drink alcohol to avoid disulfiram-like reactions.