http://www.medications.com/effect/view/22293 Just resumed my 25mg of toporol XL after a miserable 5 day trial on lisinopril. My main symptoms are PVC's, chest tightness (chronic), lightheadedness. These seem to be somewhat helped by the medication, and I wonder about upping it to 50mg (MD fine with Tue, 02 Oct 2007 09:14:48 -0400 http://www.medications.com/effect/view/22293?item=2182 I am a 38 yr old female. Previously extremely active. I have PVC's, my hr was actual 164 the day I saw a cardiologist. I am currently on 50mg toprol xl daily. I'm afraid to stop the meds but, I have soooooo many side effects. I've asked my doctor several t http://www.medications.com/effect/view/22293?item=2182