All of them, will also lower your blood pressure and that can be a problem, but I have found as long as I keep the Beta Blocker at or below 100 mg a day my BP is
normal, to low
normal. I do, however, believe the BB causes me some fatigue and lack of energy. This experience I offer along with the fact I am in my senior years and that also brings on fatigue and lack of energy. I am also in permanent atrial fibrillation and that too causes some fatigue.