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Related Experiment Videos

Intraocular penetration of netilmicin.

W M Orr, W B Jackson, K Colden

    Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
    |August 1, 1985
    PubMed
    Summary

    Subconjunctival injection of netilmicin provides higher intraocular drug levels than intramuscular injection for cataract surgery patients. This antibiotic route offers therapeutic anterior chamber concentrations for several hours with no major complications.

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    Area of Science:

    • Ophthalmology
    • Pharmacology
    • Drug Delivery

    Background:

    • Aminoglycosides are crucial antibiotics in ophthalmic practice.
    • Understanding intraocular penetration is key for effective antibiotic therapy.
    • Netilmicin is an aminoglycoside with potential ophthalmic applications.

    Purpose of the Study:

    • To evaluate the intraocular penetration of netilmicin.
    • To compare netilmicin's ocular penetration after intramuscular vs. subconjunctival injection.
    • To determine therapeutic aqueous humor levels and duration following different administration routes.

    Main Methods:

    • A study involving 102 patients undergoing elective cataract surgery.
    • Intramuscular injections of netilmicin (1.5 mg/kg single or two doses).
    • Subconjunctival injections of netilmicin (12.5 mg or 25 mg).
    • Measurement of serum and aqueous humor netilmicin levels.
    • Assessment of drug levels and duration in the anterior chamber.

    Main Results:

    • Intramuscular netilmicin yielded therapeutic serum levels but low aqueous levels (<2.4 µg/mL).
    • Subconjunctival netilmicin achieved significantly higher aqueous levels (up to 36 or 85.6 µg/mL).
    • Therapeutic anterior chamber levels persisted for 7–9 hours after subconjunctival injection, dose-dependent.
    • Ocular penetration was comparable to other aminoglycosides, despite variable aqueous levels.

    Conclusions:

    • Subconjunctival injection is superior for achieving therapeutic intraocular netilmicin concentrations.
    • Netilmicin demonstrates effective ocular penetration and sustained anterior chamber levels via subconjunctival route.
    • Both administration routes were well-tolerated, with no major complications observed.

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