Kenalog is a steroid. I am diabetic and steroids really increase my glucose, the elevated glucose levels can cause heart palpitations, high blood pressure, etc. I check my blood glucose often after my injections and cover it with Insulin. This does decrease my heart palpitations and other side effects. The only other bad side effect is the severe depression after the shot. I was going through a particularly bad time anyway, and after the shot I was suicidal. The doctor should have warned me about depression, it would have helped to know it was caused by the kenalog.