Azithromycin (Azithrx) 500mg Lyophilized Powder For Injection (IV Infusion) Vials 10's is an antibiotic used to treat a wide range of bacterial infections. It comes as a lyophilized powder that, when reconstituted, is suitable for intravenous infusion. Azithromycin works by inhibiting the growth of bacteria, thus helping to treat infections such as respiratory, skin, ear, and sexually transmitted infections, among others. This formulation is especially useful for patients who are unable to take oral medication. The 500mg dosage in each vial is intended for IV administration, with the vials typically available in packs of 10 for hospital or clinical use.