Aimed to evaluate the results of surgery in patients with obstructive prostatic hypertrophy, we studied the clinical and flow measure results from 51 patients undergoing prostatectomy (31 TUR, and 20 retropubic prostatectomies). It was shown that prostatectomy significantly improved the irritation (63% of patients), and most importantly, the obstructive (89%) symptoms. Peak flow increased in 100% of patients while maximum flow percentile in 92% of patients. Post-operative results showed no correlation to the patients' age, duration of evolution or severity of urinary symptoms, weight of prostate removed or histology of the prostate. Our results were compared with those obtained with other therapeutical options, and it was demonstrated that prostatectomy (both retropubic and RUT) are, clinically and urodynamically, the most effective procedure in the treatment of obstructive prostate hypertrophy.