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Related Experiment Videos

Loading doses and extended dosing intervals in topical gentamicin therapy.

D B Glasser, S Gardner, J G Ellis

    American Journal of Ophthalmology
    |March 15, 1985
    PubMed
    Summary

    A rabbit model study found that loading doses of topical gentamicin significantly increased early corneal concentrations. Extended dosing intervals maintained peak levels but reduced trough levels, impacting sustained gentamicin delivery.

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    Area of Science:

    • Ophthalmology
    • Pharmacokinetics
    • Drug Delivery

    Background:

    • Topical gentamicin is a common antibiotic for ocular infections.
    • Optimizing dosing regimens is crucial for effective treatment and minimizing resistance.
    • Understanding gentamicin pharmacokinetics in the cornea is essential for developing improved treatment strategies.

    Purpose of the Study:

    • To evaluate the impact of loading doses and extended dosing intervals on topical gentamicin concentrations in the rabbit cornea.
    • To compare different dosing strategies for achieving optimal gentamicin levels in ocular tissues.

    Main Methods:

    • A rabbit model was used to study topically applied gentamicin (13.6 mg/ml).
    • Loading doses (one drop/minute for five minutes) were compared to hourly and 30-minute intervals.

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  • Extended dosing intervals (two and four hours) were assessed in conjunction with loading doses.
  • Corneal gentamicin concentrations (peak and trough) were measured.

    • Main Results:

    • Loading doses significantly increased early corneal gentamicin concentrations compared to standard regimens.
    • Extended dosing intervals (two and four hours) with loading doses achieved high peak gentamicin levels (>125 µg/g).
    • However, extended intervals resulted in significantly lower trough levels compared to hourly administration.

    Conclusions:

    • Loading doses are effective in rapidly achieving high gentamicin concentrations in the cornea.
    • While extended dosing intervals can maintain peak levels, they may compromise sustained therapeutic concentrations.
    • Dosing regimens need careful consideration to balance peak and trough gentamicin levels for optimal ocular therapy.