Effects of three types of alpha-1 adrenoceptor blocker on lower urinary tract symptoms and sexual function in males with benign prostatic hyperplasia

Abstract

Objectives: The aim of the present study was to explore the effects of three different types of alpha-1 adrenoceptor blockers (α1-blocker) on lower urinary tract symptoms (LUTS), erectile dysfunction (ED) and ejaculatory dysfunction (EjD) in patients with benign prostatic hyperplasia. Methods: A total of 136 male LUTS patients aged 50-80years with International Prostate Symptom Score (IPSS) ≥8 were enrolled. They were divided into three groups. Group S received silodosin at 4mg twice a day; group T received tamsulosin at 0.2mg once a day; and group N received naftopidil at 50mg once a day. Assessment included IPSS, quality of life indexes (QOL), International Index of Erectile Function (IIEF-5), an ejaculation questionnaire, Qmax and post-void residual urine volume (PVR). These parameters were recorded at baseline, and at 1 and 3months after treatment had ended. Results: Mean IPSS and Qmax significantly improved after treatment in all groups without any significant difference among them. As for the IIEF-5 score, only group N significantly improved at 1 and 3 months. After treatment, 2.6 and 2.4% of patients complained of a de novo reduced volume of ejaculation in both groups T and N, respectively. Ten out of 41 patients (24.4%) complained of a total absence of antegrade ejaculation in group S after treatment. Conclusions: All three types of α1-blockers provided an objective and subjective improvement of LUTS in the present study population. However, erectile function only improved in patients treated with naftopidil and a higher rate of EjD was observed in those receiving silodosin. Because of their variable effects, we should consider the sexual dimension when prescribing α1-blockers for LUTS. © 2011 The Japanese Urological Association.