Metronidazole
"Oh man. Like everyone else, I'm having terrible terrible nausea and extreme fatigue. I was prescribed 500mg 2x a day. I'm on day 5 and thinking I'll just stop at this point. The side effects are too extreme. Haven't actually thrown up but certainly feel the urge to. If you have a sensitive stomach like myself, I would recommend finding another treatment if at all possible.  I'm on 3 different drugs for the BV so I can't accurately say if this is working. With the extreme side effects I would sure hope so."