bacterial infection
"I was prescribed 500mg to be taken two times a day for 15 days for BV. I had an upset stomach, dark urine, bad taste in my mouth, headaches and pain in/behind my eyes from day one through 15 on the pills. It made me lethargic and just overall under the weather. I considered stopping half way through but I could be doing more harm than good that way (you're supposed to take your full course of antibiotics to avoid bacterial resistance). My BV symptoms did clear up within 4 days or so. I must say it works well but made me feel gross :("