Hello, that's a long time to be on a medication without improvement. It sounds like your doctor is not familiar with the accepted protocol for treating MAC, which is to take 3 antibiotics at once, usually 3 times per week, but sometimes daily. Azithromycin alone is not enough to knock out MAC, it needs to be combined with ethambutol and rifampin, and sometimes, if that is not enough, a 4th medication, inhaled Arikayce may be added.

Second, there is another component to treatment, known as airway clearance, that helps eject the mucus - and the bacteria in it, from your lungs.

Perhaps you could ask to be referred to a pulmonologist or infectious disease doc who is more familiar with treating MAC?
Sue