Metronidazole More Drug_uses How Much Metronidazole Should I Take?

How much metronidazole should I take? - metronidazole more drug_uses

I am in China. I bought a bottle of tablets of 200 mg of metronidazole, because I know I have a vaginal infection. I had before, and it is bacterial. I know it is good medicine, but how do I choose? Thanks for the help.