I've been prescribed 1.25mg bisoprolol as my heart rate was too fast doc said 145 but is now down to 90. I started taking them a month ago but came off after a week because of breathing was hard. Doc asked me to retry them after having a week off them which I agreed to try. Its 2 weeks now since I restarted them but am struggling to breath when I walk any distance - just pottering round the house is ok and driving is ok but to walk any distance my chest seems to tighten and I'm gasping for air, should I wait another week or so to let the meds take proper effect before going to doc or go asap?