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Effects of naftopidil on some urodynamic parameters and arterial blood pressure in comparison with prazosin in conscious rats.

Naftopidil, an alpha 1-adrenergic antagonist, was orally tested in comparison with prazosin, in a rat cystomanometric model to evaluate the effect on the bladder volume capacity (BVC), the micturition pressure (MP) and the mean arterial blood pressure (MAP), contemporaneously recorded to evaluate the selectivity of action. Naftopidil induced a clearcut increase of BVC and a decrease of MP without lowering MAP at 6.25 mg kg-1 p.o.. Prazosin was inactive on BVC, decreased MP and induced a significant decrease of MAP at 1.56 mg kg-1 p.o. Naftopidil could offer an advantage when compared with prazosin.