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Subsensitivity to cholinoceptor stimulation of the human iris sphincter in situ following acute and chronic administration of cholinomimetic miotic drugs.

Authors
  • Smith, S A
  • Smith, S E
Type
Published Article
Journal
British journal of pharmacology
Publication Date
Jul 01, 1980
Volume
69
Issue
3
Pages
513–518
Identifiers
PMID: 6105002
Source
Medline
License
Unknown

Abstract

1 Maximal pupillary miosis was obtained with single topical applications of 4 cholinomimetic drugs in therapeutic concentrations to normal human subjects. 2 When the pupil had recovered from the miosis, there remained a reduced light reflex response of 22.7% at 24 h after aceclidine, 18.0% at 31 h after pilocarpine, 10.3% at 48 h after physostigmine and 4.9% at 7 h after arecoline. 3 This reduced sensitivity to light was accompanied by an overshoot of the resting pupil diameter and, after aceclidine miosis, a reduced response to a second application of miotic. 4 Similar findings were observed in glaucoma patients following withdrawal of chronic pilocarpine therapy. 5 It is suggested that the slowly reversible after-effects of acute and chronic administration of cholinomimetic miotics can be explained by desensitization of iris sphincter cholinoceptors.

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