Toprol-XL Side Effects: Hi, I was switced from Atenolol to Toprol-XL 50 mg about 1 year a http://www.medications.com/effect/view/23467 Hi, I was switced from Atenolol to Toprol-XL 50 mg about 1 year ago for palpatations and it seemed to work very little papations now. However, I am currently experiencing right upper quadrant pain and my triglycerides are over 500. I am told I it is drug in even i am havng such symptoms and also have become very irritable Sat, 29 Mar 2008 01:27:01 -0400 http://www.medications.com/effect/view/23467?item=6124 even i am havng such symptoms and also have become very irritable and have bouts of uncontrollable anger http://www.medications.com/effect/view/23467?item=6124