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Effects of Phenoxybenzamine on Bladder Neck Opening1

A study of the effects of the action of phenoxybenzamine on bladder neck opening during micturition is reported. Twenty patients with symptoms of prostatism but minimal prostatic enlargement were studied. Bladder neck opening was measured radiographically. Phenoxybenzamine was shown to increase bladder neck opening by an average of 30% and give symptomatic relief. Minimal side effects were noted.