My mother was put started on this 1 month ago. Shortly after she developed shortness of breath that was not releived by her inhlalers .Her dr told her to stop taking it and started her on another med. I am concerned about the black box warning regarding abrupt discontinuation. she was on 50 mg for about a month. I am thinking of calling him. I would like some stats on adverse effects of abrupt discontinuation of this med. Thank you J