Last reviewed 2026-04-22 · How we verify

QS azithromycin tablets

Azithromycin is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit.

Azithromycin is a macrolide antibiotic that inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit. Used for Bacterial infections including respiratory tract infections, skin and soft tissue infections, and sexually transmitted infections, Otitis media and sinusitis.

At a glance

Mechanism of action

Azithromycin binds to the bacterial 50S ribosomal subunit and inhibits peptide translocation, preventing the formation of the initiation complex and blocking protein synthesis. This bacteriostatic action is effective against a broad spectrum of gram-positive and gram-negative bacteria, as well as some atypical organisms. The drug accumulates in tissues and has a long half-life, allowing for extended dosing intervals.

Approved indications

• Bacterial infections including respiratory tract infections, skin and soft tissue infections, and sexually transmitted infections
• Otitis media and sinusitis

Common side effects

• Gastrointestinal disturbance (nausea, diarrhea, abdominal pain)
• Headache
• Vaginitis
• QT prolongation
• Hepatotoxicity

Key clinical trials

• Treatment of Periodontitis by Conventional 4 Weekly Sections or Within 24 Hours (PHASE4)

Primary sources

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