No harm has been found with its use during pregnancy.
Its safety during breastfeeding is not confirmed, but it is likely safe.
It works by decreasing the production of protein, thereby stopping bacterial growth.
en.wikipedia.org/wiki/Azithromycin
Azithromycin has relatively broad but shallow antibacterial activity.
It inhibits some Gram-positive bacteria, some Gram-negative bacteria, and many atypical bacteria.[
en.wikipedia.org/wiki/Azithromycin#Bacterial_susceptibility