March 1991
Volume 32, Issue 3
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Articles  |   March 1991
Aqueous humor pilocarpine and timolol levels after instillation of the single drug or in combination.
Author Affiliations
  • P P Ellis
    Department of Ophthalmology, University of Colorado Health Sciences Center, Denver 80262.
  • P Y Wu
    Department of Ophthalmology, University of Colorado Health Sciences Center, Denver 80262.
  • M Riegel
    Department of Ophthalmology, University of Colorado Health Sciences Center, Denver 80262.
Investigative Ophthalmology & Visual Science March 1991, Vol.32, 520-522. doi:
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      P P Ellis, P Y Wu, M Riegel; Aqueous humor pilocarpine and timolol levels after instillation of the single drug or in combination.. Invest. Ophthalmol. Vis. Sci. 1991;32(3):520-522.

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Abstract

Aqueous humor levels of pilocarpine and timolol in rabbits after administration of either 2% pilocarpine or 0.5% timolol in single-drug solutions were compared with the concentrations found after instillation of a fixed combination of 0.5% timolol and 2% pilocarpine drops. Time intervals considered were 15 min, 30 min, 1 hr, 4 hr, and 8 hr after application. Drug concentrations were analyzed in individual aqueous samples by high-performance liquid chromatography. No statistically significant differences in either pilocarpine or timolol concentrations in aqueous humor were found at any time tested between the single-drug preparations and the combination.

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