Metronidazole
"I'm on day 3 of the medicine and I have to say it's working wonders! 500 mg every 8 hours for 10 days, 30 pills altogether. I have a bacterial infection that caused acute diarrhea and I'm already experiencing almost no loose stool after taking the medicine for a few days. The side effects suck though. I've had a chronic headache, bitter/metallic taste when I drink cold things, and am experiencing a bit of insomnia. I have to say the side effects are worth the benefits because I can tell that the infection is slowly going away."