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Article
May 1969

The Interactions of Local Guanethidine and Sympathomimetic Amines in the Human Eye

Author Affiliations

London
From the Division of Clinical Pharmacology, Medical Professorial Unit, St. Bartholomew's Hospital, London.

Arch Ophthalmol. 1969;81(5):622-627. doi:10.1001/archopht.1969.00990010624005
Abstract

The responses of the human eye to the intraocular administration of the adrenergic neurone blocking drugs guanethidine sulfate and debrisoquin sulfate have been investigated by photographically recording the pupillary changes. After protracted treatment with local guanethidine sulfate (100 mg/ml), the mydriatic action of phenmetrazine hydrochloride, amphetamine sulfate, hydroxyamphetamine hydrobromide, ephedrine hydrochloride, and tyramine hydrochloride was abolished and that to methoxamine hydrochloride, epinephrine bitartrate, and phenylephrine hydrochloride potentiated. Following chronic debrisoquin (20 mg/ml) the mydriatic responses to phenylephrine and ephedrine were potentiated. These results indicated that guanethidine exhibits pharmacological actions which parallel postganglionic sympathectomy, while debrisoquin mimicks preganglionic sympathectomy.

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