Clindamycin
"I was prescribed this medication for after having all my wisdom teeth removed to prevent infection. I took 1 capsule 3 time a day. For the first few days it was fine, I found if you don't take it with a lot of water it burned all the way down and it made me feel funny with a metallic taste in my mouth. Around day 3 I started having cramps in my stomach, back, and right under my ribcage so painful they would keep me up at night and wake me up out of a dead sleep. I was warned that it could cause stomach problems so I didn't think much of it, but it's been a week since I stopped taking them and I'm getting these awful cramps still. Off to the doctor tomorrow for me. (I took probiotics the entire time I was on it and lived off yogurt too)"