I've taken steroid inhalers for asthma prevention, although I'm not on any currently. I do have albuterol inhalers and EpiPen in case of emergency, but I don't take them often because they make my heart race. I find that sometimes it helps my O2 levels to get into a supine position. I assume that's probably when POTS is the main issue, not the asthma, because during a traditional asthma attack it's easier to breath in tripod position.