Metronidazole
"I've had this medication twice now, once for BV and once for another illness. Even though it was effective in treating the infections, the pills had some very uncomfortable side effects including drowsiness, fatigue, upset stomach, and a dry cotten mouth with a horrible taste. I felt as though I had some sort of flu that would ease as each pill would wear off, but then I had to take another. I truly dreaded taking the next pill. I hope other people faired better."