I think I understand, then, that Arikayce is a brand name of the drug Amikacin. Amakacin is given IV or injected. The inhaled Arikayce I take now is liposomal - yes, encased in a fat globule. Subjectively, I feel that the Arikayce is the most effective in bringing up - or at least just clearing - the teeny-tiny bit of sputum that I have. SO many drugs and I'm trying to learn! I think I've finally understood that there are multiple ways to treat MAC/MAI, it affects everyone differently, and that just because the Mycobacterium isn't completely gone, I can still have a somewhat fair quality of life ... that it's not a death sentence as I initially thought. THANK YOU for your comments.