bronchospasm prophylaxis
"My doctor put me on this because I have sleep apnea and have trouble breathing when I go to sleep.  Because of my extreme weight loss I have been able to lower my CPAP pressure to the lowest setting and I use my inhaler each night before bed to help my breathing to be able to fall asleep.  I doesn't help though if I'm already short of breath.  I have no side effects and have been using it for 3 years."