Summary
In 7 healthy volunteers 4% morphine eye-drops, when administered to one eye, caused a miosis limited to that eye. In 7 other healthy volunteers morphine was administered into one eye after bilateral instillation of 0.5% homatropine opthalmic drops; the eye treated with morphine and homatropine showed a mydriasis less intense than the other eye treated only with homatropine. It is suggested that topical morphine locally affects sympathetic function by inhibiting noradrenaline release into the iris neuromuscular junction.
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This work was partly supported by the CNR study group ‘Pain Control’. The authors wish to thank Dr Tendi of the Pharmacy of St. Maria Nuova Hospital, Florence, for the preparation of the eye-drops.
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Fanciullacci, M., Cangi, F., Gatto, G. et al. Morphine eye-drops reduce homatropine induced mydriasis in man. Experientia 40, 731–733 (1984). https://doi.org/10.1007/BF01949747
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DOI: https://doi.org/10.1007/BF01949747