Azithromycin Tablets IP N-Zet-250is a broad-spectrum type of antibiotic effective in killing many types of gram-positive bacteria, some types of gram-negative bacteria and other microorganisms. It works by stopping the growth of bacteria. This medication will not work for viral infections. It should be used regularly at evenly spaced time intervals as prescribed by your doctor. Azithromycin Tablets IP N-Zet-250is also used to treat a wide variety of bacterial infections. This is very cost effective as well as safe to use.