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February 1, 20264 min readMedicines & Drugs

Azithromycin API: Macrolide Antibiotic Uses and Formulations

Azithromycin is a widely prescribed macrolide antibiotic. This article summarises how the API is used in oral and injectable products and key quality requirements.

Azithromycin API: Macrolide Antibiotic Uses and Formulations

Overview of Azithromycin API

Azithromycin is a macrolide‑like azalide antibiotic used for a wide range of community‑acquired infections, including respiratory tract, skin, and sexually transmitted infections. Its long half‑life allows for short, convenient treatment courses. As an API, it is formulated into tablets, capsules, oral suspensions, and parenteral products.

Main Indications

  • Upper and lower respiratory tract infections
  • Skin and soft tissue infections
  • Uncomplicated genital infections due to Chlamydia trachomatis
  • Non‑gonococcal urethritis and cervicitis

API and Formulation Considerations

Azithromycin is lipophilic and sensitive to moisture, requiring appropriate protective packaging and desiccants. Key quality attributes include assay, impurity profile, residual solvents, and control of isomeric composition. Formulations often use enteric coatings or suitable excipients to improve stability and patient acceptability.

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