March 1982
Volume 22, Issue 3
Articles  |   March 1982
Mydriasis induced by tetrahydrocannabinol (THC) in rats.
Investigative Ophthalmology & Visual Science March 1982, Vol.22, 408-410. doi:
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      A D Korczyn, Y Eshel; Mydriasis induced by tetrahydrocannabinol (THC) in rats.. Invest. Ophthalmol. Vis. Sci. 1982;22(3):408-410.

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      © ARVO (1962-2015); The Authors (2016-present)

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Male albino rats, injected intravenously or intracerebroventricularly with delta 1-tetrahydrocannabinol (THC), develop mudriasis. The median effective dose of the intravenous administration group was 5 mg/kg THC, whereas that for the intracerebroventricular route was 150 microgram/kg THC. Sympathectomy significantly decreased the THC-induced mydriasis. The mydriatic effect was not influenced by naloxone. We conclude that THC produces mydriasis through a central action, the efferent pathway of which is the sympathetic system.


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