Metoprolol
"I recently switched from metaprolol, 1/2 of 25 mg/ day to brand name Toprol xl & have found the negative side effects- fatigue, too low blood pressure, dizziness, nausea- to be much less. I still feel a little of that about 12 hours after I take it- I figure that is a slight " withdrawal" effect, it lasts about 30-45 min. & I don't have it every day. When I took the generic ( manufacturer, PAR) I felt on a roller coaster, up & down all day. The time release delivery feels to be much smoother with the brand name, toprol- I recommend it. All in all, it works well, keeps my heart in sinus rhythm, but it's a tough drug to have to take."