I am not taking azithromyocin but I am very pro probiotics. I use a DF Dairy Free type. A high potency one, used the last 23 months since going on the MWF intermittent regimen, with Rifampin, Ethambutol and Clarithromycin.
Just ask your doctor if s/he has any objections to your using one. I sometimes feel they just don’t bring it up since it is non-scripted. I really feel it is necessary.