Carvedilol
"i was on atenolol for a year 25 mg prn for palpitations.  Then i felt like crap without it.  Started experiencing more palpitations, doc put me on it twice a day. after a bout with ED, I asked to be put on something else, doc didn't budge.  I was diagnosed with mild aortic valve regurg. new doc, reluctantly switched me to coreg 12.5 2xday.  No longer ED, but it makes my heart rate go from 72 w/bp 126/69 at rest to 50 with bp raised to 149/78 with that low a pulse. Horrible bouts of light-headedness, subdermal rashes that won't go away, 50 pounds gained with even more exercise and closely monitored diet than before, and blood pressure that will not stay regulated.  Never had high bp before getting on beta blockers.  stay away unless absolutely necessary!!!!"