Question: how often do you take metronidazole 500mg?
Answer: Adults—500 or 750 milligrams (mg) 3 times a day for 5 to 10 days. Children—Dose is based on body weight and must be determined by your doctor. The dose is usually 35 to 50 milligrams (mg) per kilogram (kg) of body weight per day, divided into 3 doses, for 10 days.