Objectives: To investigate the efficacy of tadalafil for patients with benign prostatic hyperplasia and especially with chronic prostatitis/chronic pelvic pain syndrome.Methods: Tadalafil 5 mg was given each morning for 12 weeks to patients diagnosed as having either moderate or severe lower urinary tract symptoms. Voiding symptoms were compared between patients with a high (>4; high group) and low (<4; low group) pain subscore of the National Institutes of Health Chronic Prostatitis Symptom Index before and after tadalafil administration. Correlation between changes in the Chronic Prostatitis Symptom Index and the International Prostate Symptom Score during treatment was also investigated.Results: At the pretreatment baseline, the pain subscore of the Chronic Prostatitis Symptom Index was high (>4) in 24 of 74 (32.4%) patients. The International Prostate Symptom Score in the group with high pain subscore was significantly higher than that in the group with low pain subscore. As an indicator of the efficacy of tadalafil, the International Prostate Symptom Score and National Institutes of Health Chronic Prostatitis Symptom Index total score and pain subscore were significantly improved.The change in the Chronic Prostatitis Symptom Index total score correlated positively with the change in the International Prostate Symptom Score. The decrease in the 4 International Prostate Symptom Score was significantly greater in the group with high versus low pain subscore. Conclusion:Tadalafil was sufficiently effective in the treatment of patients with benign prostatic hyperplasia and severe chronic prostatitis/chronic pelvic pain syndrome.
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