bacterial infection
"I was prescribed 500mg for twice a day in order to get rid of my BV. I only had a small headache the first night and slight nausea, but it wasn't bad at all. The rest of the days and nights were fine. BUT, this is what I did: ate a big brunch and a big dinner, and took the pill in between eating each meal. During the middle of the day I ate something with probiotics, like kimchi or cultured cashew cheese. At night before bed I would have I high quality probiotic pill with 50 billion cultures that support vaginal health.  Other than that, lots of water, healthy food, and using condoms! Good luck!"