Abstract
Urodynamic investigations provide an objective, quantitative evaluation of urinary function in patients with benign prostatic obstruction (BPO). The effects of doxazosin, a selective alpha 1-adrenoceptor antagonist, on urodynamic measurements were investigated in three double-blind, placebo-controlled clinical studies of the treatment of BPO. 302 normotensive and mildly hypertensive men with BPO were evaluated. Patients were randomized to receive doxazosin (1-4 mg o.d.) or placebo for 4-29 weeks. Doxazosin significantly improved free urinary flow rates compared with placebo. Urodynamic studies confirmed that doxazosin was effective in improving urinary flow, and also showed a reduction in detrusor pressure, resulting in decreased voiding time and increased voided volume. Analysis of pressure-flow data demonstrated a significant reduction in a measure of urethral resistance in doxazosin-treated patients. These results indicate that doxazosin is an important treatment option for patients with troublesome lower urinary tract symptoms and BPO.
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