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Cloxacillin penetration

M M Uwaydah, B M Faris, I N Samara

American Journal of Ophthalmology

|July 1, 1976

Summary

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Intramuscular cloxacillin did not reach detectable levels in the aqueous humor for cataract surgery patients. Subconjunctival injection of 250 mg cloxacillin, however, achieved therapeutic antibiotic levels in the aqueous humor.

Area of Science:

Ophthalmology
Pharmacology
Infectious Diseases

Background:

Cataract surgery requires effective antibiotic prophylaxis to prevent postoperative endophthalmitis.
Understanding intraocular antibiotic penetration is crucial for optimizing treatment strategies.

Purpose of the Study:

To evaluate the intraocular penetration of cloxacillin following different administration routes.
To determine the effective dosage of cloxacillin for achieving therapeutic levels in the aqueous humor for cataract surgery patients.

Main Methods:

Investigated intraocular penetration of cloxacillin in 14 patients undergoing senile cataract surgery.
Administered cloxacillin via intramuscular and subconjunctival injections.
Measured antibiotic levels in aqueous humor post-administration.

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Main Results:

No detectable cloxacillin levels were found in the aqueous humor after intramuscular injection (1–4 g).
Therapeutically effective cloxacillin activity was detected in the aqueous humor following subconjunctival injection (250 mg).

Conclusions:

Subconjunctival injection is a more effective route than intramuscular for achieving therapeutic intraocular cloxacillin levels.
A 250 mg subconjunctival dose of cloxacillin appears sufficient for intraocular penetration in cataract surgery patients.