cost. cfc inhalers run about $5 to $25 apiece whereas the hfa inhalers cost $30 to $60 according to the american academy of allergy asthma & immunology. the hfa inhalers that have been available for about two years are brand-name and it could be five years before patents expire allowing less expensive generics to enter the market.
what's the major difference between cfc and hfa inhalers?