Zithromax, also called azithromycin dry mix, is an antibiotic that belongs to the macrolide class of antibiotics, with azithromycin as the main active ingredient. Azithromycin is a macrolide antibiotic. Azithromycin mainly inhibits bacterial protein synthesis by binding to the corresponding sites of the ribosomes of pathogenic bacteria. Azithromycin has a certain antibacterial effect on both Gram-positive and negative bacteria. Among the positive bacteria, it has a certain antibacterial activity against Staphylococcus aureus, Streptococcus pyogenes, Streptococcus pneumoniae, Streptococcus haemolyticus, as well as other streptococci and Corynebacterium diphtheriae. In addition, it has some antibacterial activity against gram-negative bacteria, such as Haemophilus influenzae, Haemophilus parainfluenzae, Catamorax, and Bacillus immobilis. Besides, azithromycin also has some antibacterial effect on some atypical pathogens. In clinical practice, azithromycin dry mix is mainly used for infectious diseases caused by sensitive bacteria, such as bronchitis, pneumonia and other lower respiratory tract infections. It can also be used for upper respiratory tract infections such as sinusitis, pharyngitis, tonsillitis, etc. It can also be used for acute otitis media, skin and soft tissue infections. In addition, it can also be used for simple genital infections caused by Chlamydia trachomatis in male-to-female transmission diseases. In conclusion, Zithromax Azithromycin Dry Mix is an antibiotic that can be used mainly for infectious diseases caused by sensitive bacteria.