I ended up going to ER for fast heart rate recently. I was just getting over pneumonia, doing fine. They had put me on zithromax and prednisone. Only thing I can attribute that caused the fast heart rate a few days later was the prednisone. They kept me overnight for two nights for observation. Also had an echocardiogram that proved normal. Released me and was prescribed with cartia xt and Eloquis. Those two drugs seemed to bring on dizziness, feeling tired and weak, feeling confused, slow heart beat, shortness of breath. So, I discontinued those two drugs and seem to be fine as of 3 days later. Am lined up for primary care apt and cadiologist apt. I feel that these drugs were really screwing me up.