Metronidazole
"I'm an on this medication for the second time. 
The first time I didn't wait long enough before I had sexual intercourse and that caused the bacterial infection to come right back. 
But I am on my first day for the 7 day treatment and I am really nauseous and I'm really tired. The first time I took this medicine the side effects didn't start until day 3. As I'm typing this, I feel lost I'm going to vomit any second while barely keeping my eyes open. 
Nonetheless it works really well."