How long can azithromycin be taken safely?[for long term treatment] if one has recurrent sinus +chest +throat infection in one go?

Months: There are certain chronic infections that are very difficult to treat, an dpeople can be on antibiotic regimens that include Azithromycin for over a year. People need to be monitored to make sure their white blood cells, liver, and kidneys are ok, but Azithromycin tends to be a relatively safe antibiotic. The question is whether other interventions in addition to antibiotics will help.