@mollyfoxalden123 I started with those doses with a Pulmonologist I no longer see. I could not tolerate and got very ill and stopped taking all three. Finally changed doctors after 6 months. Now on Rifampin 600 3 days a week and azithromycin 250 plus ethambutol 800 7 days a week. Couldn't tolerate Rifampin 7 days. Trying that for 3 days a week now. Just started that this week after a one week break. Doctor can adjust doses if need be. Let them know if you experience any problems.