bacterial vaginitis
"I'm currently taking this medication to treat a bv infection. I'm starting day five out of seven and am experiencing intense side effects as listed by most of the women here. Weird painful headaches, nausea, diarrhea, sharp stomach pains... After reading  the precautions, I question how safe it really is. Apparently it's been known to cause cancer in mice and rats. I want to stick it out to the end but am miserable so will call my Dr in morning to ask."