Is the Medihaler-Iso (Isoproterenol Sulfate) Inhalation Aerosol Asthma medication still available or has it been discontinued? I've tried most of the others and they really don't work. You really have to do too many repeat dosages to get relief and even then, it's not complete relief. Know what I'm taking about? Have any good suggestions? ## It is still available, though it is rarely used, since other treatments have been proven more effective, so it may be difficult to find a pharmacy that carries it. What you may need to do is ask if one can order it in for you. Which others have you tried?