Nebivolol
"49 yo male, generally healthy including normal blood pressure.  I had a bare metal stent placed in a main artery and have been on 2.5 mg of Bystolic for 3 months now.  For the most part I feel good. The subtle changes to my body I have noticed include uncertainty, forgetfulness, fatigue and working at a slower pace. Never being on any medications prior to my procedure I became concerned  and phoned my Cardiologist.  Their reply: "Oh we hear that all the time from patients on the drug, it's normal.  You body is adjusting as it would to pair of new eye glasses".  It didn't make me feel any better."