Light-dark variations in ocular timolol concentrations following topical solution installation in the pigmented rabbit

Shigehiro Ohdo, Jianyi Zhu, Vincent H.L. Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The objective of this study was to determine whether ocular absorption of topically applied timolol in the pigmented rabbit varied with the time of drop installation. Twenty-five microliters of a 0.65% timolol maleate solution were instilled in the pigmented rabbit eye at 0600, 0900, 1200, 1500, 1800, 2100, 2400, or 0300 hr. Timolol concentrations in the conjunctiva, sclera, corneal epithelium, corneal stroma, aqueous humor, and iris-ciliary body at 15 and 30 min post-dosing were monitored using reversed phase HPLC. Ocular timotol concentrations were higher when the drug was administered during the light period (0900-1800 hr) than when it was administered during the dark period (1800-0600 hr). There exist, therefore, light-dark variations in the ocular absorption of topically applied timolol.

Original languageEnglish
Pages (from-to)2025-2031
Number of pages7
JournalLife Sciences
Volume51
Issue number26
DOIs
Publication statusPublished - 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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