I am 23 years old and I am here to post how I'm feeling on 12.5 mlg of toprol xl. The first week I felt fine, my BP continues to be low but my headaches are almost completely gone. The second week I only had problems 12 hours after taking the pill. My heart rate goes up to 95 bpm. I try to ignore it and fall asleep. When I wake up I feel ok. Then I take the pill and same thing the next day. Wednesday I will go completely off pill. I am very nervous. I do have the cardionet heart monitor and it comforts me. I do not want to end up in the ER due to palpitations. I will keep you posted.