high blood pressure
"I have been on Bystolic for about 10 months now.  I have been on 15 different blood pressure medicines because I am allergic to everything under the sun.  I can tolerate this medicine and it is great at keeping my blood pressure down to 123/80 but it slows my heart rate way down and my body does not tolerate that well.  After taking it for a while and now exercising by walking every other day I have had to decrease the amount of it I take because my blood pressure went down to 93/50.  It also gives me awful headaches and causes balance problems for me.  I guess I have to tolerate the side effects because I have had so much trouble taking other medicines.  "