Have taken for bronchiectasis for 18 months now. Like many bronchX sufferers I have found them to be great in reducing the number of infections I get. In addition to having an anti-bacterial effect they stand out as being the antibiotic that is also an anti-inflammatory capability which is why many sufferers regard them as a bit of a miracle drug and why pulmos appear increasingly to be prescribing them, subject to cost constraint*. Most bronchX sufferers that have found them take 3-a-week on a day 2 + day 4 + day 7 basis (ie two 2 day breaks followed by a 3 week break.
Good idea, as suggested by previous poster to take them on Mon/Wed/Fri - avoids needing to take them on weekend days when many people have more diversions than otherwise. Take at roughly the same time each day (though I don't think that is absolutely essential) but it has to be in a window that is at least two hours after eating and one hour before. Take them - with a glass of water - when you wake up/get up if you don't need to eat immediately on waking (I find that I more easily forget meds that are taken at a later stage of the day).
When I get an infection that is sufficiently troubling that I call it an exacerbation I take a week of daily azith. If that doesn't kill it in the second week I revert in the 2nd week to 3-a-week azith and supplement that with a daily 500mg dose of levafloxacin. That latter regime was suggested by my Thai pulmo (I'm a Brit expat here) on the basis that my sputum never shows any result of specific bug in a culture test and levafloxacin is a pretty effective muti-bug antibi. Those who can give bug-identifiable samples should work out their own tailored rescue plan with their own medical adviser, preferably an experienced pulmonologist.
*Azith is more expensive than some of the earlier stage antibis like amoxycillin and doxycycline, but less expensive than levafloxacin and avelox (if the prices I pay in Thailand are indicative of their western source pricing!)