Hi, I'm a 33 year old male, not overweight, not diabetic, I've been dealing with tachycardia for some time now. It comes and goes. I found that 50mg of Metoprolol twice a day would mostly control it, but as a 33 year old man, I began to notice major erection issues since being on it. Talked to my doctor, they want me to start 120mg a day of Diltiazem. I'm a little nervous about it, but they assured me it's no more potent a medication.