Nothing else seems to work. I was also scared that the mac would get resitance to arithromycin. I use to be on 1 a day and then he went to 500 every third day. I still do the salt morning and night. I have gone a month without anything thinking i will beat this mac shit and then i can feel my spots again. One dr ask my wife if I was nuts and she said yes. My dr is good he lets me do my own thing. Mac does not show up in a chest xray.