Hello Shifra - Everybody is different, with their own physiology & other medical conditions to consider. Was the return of MAC diagnosed with multiple sputum specimens, or is this an assumption based on symptoms? I would be sure the MAC showed up in multiple cultures, and that sensitivity tests were conducted before I even considered the meds a second time. There are people on this list (like Terri) who have worked out alternative regimens with their doctors. Make sure you have a pulmonologist and/or infectious disease specialist who is well-versed in MAC on your treatment team. Good luck!