I recently had an episode of rapid heartbeat. At my second ER visit the doctor started me on metoprolol tart 25mg twice a day, which I took it that way for 2 full days. Then I seen my regulars doctor and she reduced this to one a day in the morning. I have only been on this medication for 7 days. I have experienced tingling in my legs, pressure in my head, takes time for eyes to focus on things, jittery, pain in my chest area and back, and in the morning my heart rate is usually high when I get up anywhere from 110-130. Is this a normal reaction to this medication? My doctor thinks my rapid heart rate is due to severe anemia and possible hyperthyroidism. So she may stop this medication completely due to me haveing a normal chest X-ray, 4 normal EKGs, and halter monitor showed normal sinus rhythms even with rapid heart rate. The doctor also started me on Xanex, which I try to only take at bedtime.