Sixty-four patients who underwent unilateral bladder neck incision (BNI) between 1980 and 1983 were reviewed. In 53 cases the flow rates showed no significant change from immediate post-operative values. All patients were interviewed or completed a questionnaire which demonstrated that 87% were satisfied with the long-term outcome of surgery. The incidence of repeat bladder neck incision or transurethral resection of prostate (TURP) compared well with the incidence reported in other studies, as did the recorded incidence of retrograde ejaculation at 16%, although 52.5% of patients noted a reduction in the volume of ejaculate.