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[Retinal toxicity of intravitreal doxycycline. A pilot study]
E Aydin1, A A Kazi, G A Peyman
1University of Arizona, Department of Ophthalmology, Tucson, Arizona, United States of America.
Archivos De La Sociedad Espanola De Oftalmologia
|April 20, 2007
Summary
Intravitreal doxycycline is safe at concentrations of 125 µg/0.1 ml or less in rabbits, showing no retinal toxicity. This finding supports its potential use for bacterial endophthalmitis treatment.
Area of Science:
- Ophthalmology
- Pharmacology
- Toxicology
Context:
- Bacterial endophthalmitis poses a significant threat to vision.
- Tetracycline antibiotics, including doxycycline, are used systemically for various infections.
- The safety and efficacy of intravitreal administration of doxycycline for ocular infections require investigation.
Purpose:
- To evaluate the retinal toxicity of varying concentrations of intravitreally administered doxycycline in albino rabbits.
- To determine the safe dosage range for intravitreal doxycycline to prevent ocular damage.
Summary:
- New Zealand albino rabbits received intravitreal injections of doxycycline at concentrations ranging from 62.5 to 2000 µg/0.1 ml.
- Electroretinography (ERG) and ophthalmic examinations (indirect ophthalmoscopy, slit-lamp biomicroscopy, light microscopy) were used to assess retinal function and toxicity.
- Doxycycline at concentrations of 125 µg/0.1 ml or lower did not cause significant retinal toxicity or alter ERG findings.
Impact:
- Intravitreal doxycycline is deemed safe at concentrations up to 125 µg/0.1 ml in rabbits.
- This study suggests that intravitreal doxycycline could be a safe, inexpensive alternative for treating bacterial endophthalmitis, especially against resistant Staphylococcus aureus.
- Further research may explore the therapeutic potential of intravitreal doxycycline in clinical settings.
