Clindamycin
"I was prescribed Clindamycin by my oral surgeon as a prophylactic antibiotic before having my wisdom teeth extracted.  Neither the doctor, pharmacist, nor the drug fact sheet indicated that it could cause severe heartburn or chest pains.  

Within a day of taking Clindamycin, I had developed clenching chest / esophageal pain and heartburn.  My doctor extended my Clindamycin script to fight these symptoms.

I went to the E.R. this morning for fear that my artificial pulmonary valve was infected.  I was told to take Maalox.

After stopping my Clindamycin dosage (I have already finished all that were initially prescribed), my fever has broken, rash went away, and I feel drastically better."