bacterial infection
"A dentist prescribed Clindamycine, 300 mg for treating a dental infection. After taking it for 2 days, I woke up late at night with very serious burning heartburn that ran through my back.  Never experienced this heartburn before in my life! Went to the hospital ER.  They checked for heart issues which were none, gave me a antacid mixture which got rid of it, called it Gastritis, and sent me home.  I still have heartburn pain when I drink or eat, 24 hours later.  I hope it eventually goes away.  Don't take a chance with this antibiotic."