Naftopidil versus tamsulosin hydrochloride for lower urinary tract symptoms associated with benign prostatic hyperplasia with special reference to the storage symptom: a prospective randomized controlled study.

Author(s): Ukimura O, Kanazawa M, Fujihara A, Kamoi K, Okihara K, Miki T, Kyoto Prefectural University of Medicine Benign Prostatic Hypertrophy Research Group

Affiliation(s): Department of Urology, Kyoto Prefectural University of Medicine, Kyoto, Japan. ukimura@koto.kpu-m.ac.jp

Publication date & source: 2008-12, Int J Urol., 15(12):1049-54.

Publication type: Comparative Study; Multicenter Study; Randomized Controlled Trial

OBJECTIVES: In order to compare the clinical efficacy of naftopidil (Naf) and tamsulosin hydrochloride (Tam), which differ in their selectivity to alpha receptor subtypes, we performed a multi-center prospective randomized controlled study. METHODS: Men complaining of lower urinary tract symptoms due to benign prostatic hypertrophy, were randomized into two treatment groups: one receiving 50 mg Naftopidil daily (Naf group, n = 31 pts), and one receiving 0.2 mg Tam once daily (Tam group, n = 28 pts). Baseline symptom scores were compared to those at 2 weeks and at the end of the observation period (6-8 weeks). RESULTS: In the Naf group at 2 weeks, the score of the daytime frequency significantly improved from 3.5 to 2.2 (P = 0.03), and the score of nocturia improved significantly from 3.5 to 2.2 (P = 0.0004), respectively. In the Tam group at 2 weeks, however, no significant improvement was noted in the increased score of daytime frequency (P = 0.1) or nocturia (P = 0.2). At 2 weeks, the storage symptom score of the frequency to the combined score of daytime frequencies and the score of nocturia was better in the Naf group (improved from 7.0 to 4.4, P = 0.0017) than in the Tam group (from 6.8 to 4.9, P = 0.08) (P < 0.05). At 6-8 weeks, the effects of the two drugs on lower urinary tract symptoms were comparable. CONCLUSIONS: Naf demonstrated a significant early response to improve storage symptoms at 2 weeks, including daytime frequency and nocturia, compared with Tam.