I had a tooth ache and my right side of face was getting a little puffy. I went to the dentist and they took an x-ray and saw that I had an infection and needed a root canal. I did and they put me on Clindamycin 150 mg for the infection and that stuff is making me feel like I am having a heart attack. Bad side effects of indigestion and heartburn. Not taking it anymore as the swelling has gone down and the tooth feels so much better. I did call to make sure that I could stop this antibiotic because it does not like me. Of course, my husband was out of town during all this and last night I thought I was having a heart attack. Has anyone had to take this antibiotic?