Taking metronidazole for bacterial vaginosis-- 500mg or 1000mg per day?

I was prescribed metronidazole for bacterial vaginosis. When the doctor was writing the prescription I could've sworn she said "take this once a day," but when I filled the prescription, I noticed that the bottle said to take twice daily. The tablets are 500mg strength. There are 14 tablets, so it... show more I was prescribed metronidazole for bacterial vaginosis. When the doctor was writing the prescription I could've sworn she said "take this once a day," but when I filled the prescription, I noticed that the bottle said to take twice daily. The tablets are 500mg strength. There are 14 tablets, so it seems reasonable that I would take them twice a day rather than once. What is the typical dosage in this situation?
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