Azithromycin 1% ophthalmic solution is a topical macrolide antibiotic used in the treatment of bacterial eye infections, particularly bacterial conjunctivitis (pink eye).

It works by inhibiting bacterial protein synthesis through binding to the 50S ribosomal subunit, thereby preventing bacterial growth and replication.

Indications

• Bacterial conjunctivitis
• Other superficial ocular bacterial infections (off-label: blepharitis)

Pharmacological Class

• Macrolide antibiotic

Mechanism of Action

Azithromycin exerts its antibacterial effect by:

• Blocking RNA-dependent protein synthesis in bacteria
• Preventing bacterial growth (bacteriostatic action)

Dosage Form & Strength

• Ophthalmic solution (eye drops)
• Concentration: 1% (10 mg/mL)

Typical Dosage Regimen

• 1 drop in the affected eye(s):
  • Twice daily for the first 2 days
  • Then once daily for the next 5 days

Pharmacokinetic Features

• Provides prolonged ocular surface contact due to specialized delivery systems (e.g., mucoadhesive polymers)
• Achieves high tissue concentrations in conjunctiva and cornea

Common Side Effects

• Eye irritation, burning, or stinging
• Redness or blurred vision
• Mild ocular discomfort

Serious (Rare) Adverse Effects

• Severe allergic reactions (anaphylaxis)
• Skin reactions (e.g., Stevens–Johnson syndrome)
• Vision changes or severe eye inflammation

Precautions

• Avoid wearing contact lenses during treatment
• Do not touch dropper tip to prevent contamination
• Complete full course to prevent bacterial resistance

Patient Disclaimer

This information is for educational purposes only and is based on reputable medical sources such as MedlinePlus and Mayo Clinic.
It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before using this medication. Do not use azithromycin eye drops without a prescription, and seek immediate medical attention if serious side effects or allergic reactions occur.

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