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Equiactive antihypertensive doses of clonidine, alpha-methyldopa, hydralazine, propranolol and of a novel compound 355-1057 were tested in an experimental model in which sexual activity was stimulated pharmacologically by lisuride. It was found that those antihypertensive drugs known to cause disturbances in sexual function in men, i.e., clonidine, alpha-methyldopa, hydralazine and propranolol, inhibited lisuride-induced mounting behaviour in male rats, as measured by a decrease in the percentage of animals mounting or in the number of mounts per active animal. The novel antihypertensive compound 355-1057, that seemed in preliminary clinical trials to be devoid of sexual side-effects in men, had no significant effect on the mounting behaviour. It seems, therefore, that the present experimental model could be predictive for antihypertensive drug-induced sexual side-effects in man.
M O Carruba, and
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P Mantegazza
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