I'm not sure if anyone can answer my question about Umeclidinium 62.5? Has anyone heard if this can cause any problems over long term use, I read that certain asthma inhalers can buildup in your system, example PROAIR HFA and could cause problems later on after long term use? I just need to know a little more about Umeclidinium 62.5 there seems to be vague info about this medication.