Clindamycin
"Developed a bad infection in my face from a tooth abscess. My faced swelled quite a bit. I was on penicillin for a couple days and the swelling got worse. Within a couple days of switching to clindamycin the swelling was going down. I set an alarm to take it in the middle of the night. I had to eat something small with it or I'd get nauseous and sit upright for 30 minutes.  I took acidophilus and ate yogurt to help with digestive upset. I developed a full body rash by day 6 and was advised to stop taking it but by then the swelling was gone. My stomach was messed up for months after stopping. I now put it down as an allergy. "