Zivac 500 Injection contains Azithromycin 500mg, a broad-spectrum macrolide antibiotic effective against a variety of bacterial infections. It is indicated for the treatment of respiratory tract infections, skin and soft tissue infections, sexually transmitted infections, and certain types of bacterial gastroenteritis. Azithromycin exerts its antibacterial effect by inhibiting bacterial protein synthesis through binding to the 50S ribosomal subunit, thereby preventing bacterial growth. Zivac 500 Injection is administered intravenously or intramuscularly, providing rapid systemic absorption and achieving high tissue concentrations. This formulation is particularly useful in patients who are unable to take oral medications or require prompt therapeutic levels. The typical dosage and duration of therapy depend on the type and severity of the infection, as well as patient-specific factors such as renal and hepatic function. Common adverse effects may include gastrointestinal disturbances, such as nausea, vomiting, and diarrhea, as well as potential hypersensitivity reactions. Caution is advised in patients with known macrolide hypersensitivity or pre-existing liver disease. Zivac 500 Injection should be used under medical supervision, with adherence to recommended dosing guidelines to minimize resistance development and ensure optimal clinical outcomes.