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Abstract

Volume 10, Issue 4 (July 2008) 10, 651–658; 10.1111/j.1745-7262.2008.00336.x

Effect of an extract of Ganoderma lucidum in men with lower urinary tract symptoms: a double-blind, placebo-controlled randomized and dose-ranging study

Masanori Noguchi, Tatsuyuki Kakuma, Katsuro Tomiyasu, Yoshiko Kurita, Hiroko Kukihara, Fumiko Konishi, Shoichiro Kumamoto, Kuniyoshi Shimizu, Ryuichiro Kondo and Kei Matsuoka

1.Department of Urology, Kurume University School of Medicine, Kurume 830-0011, Japan
2.Department of Bio-statistics, Kurume University School of Medicine, Kurume 830-0011, Japan
3.Research Laboratories, Chlorella Industry, Chikugo 833-0056, Japan
4.Department of Forest and Forest Products Science, Faculty of Agriculture, Kyushu University, Fukuoka 812-8582, Japan

Correspondence: Dr Masanori Noguchi, Department of Urology, Kurume University School of Medicine, 67 Asahi-machi, Kurume 830-0011, Japan. Fax: +81-942-34-2605. E-mail: noguchi@med.kurume-u.ac.jp

Received 27 June 2007; Accepted 25 July 2007.

Abstract

Aim: To conduct a double-blind, placebo-controlled randomized and dose-ranging study to evaluate the safety and efficacy of the extract of Ganoderma lucidum (G. lucidum) in men with lower urinary tract symptoms (LUTS).

Methods: We enrolled male volunteers (≥ 50 years) with an International Prostate Symptom Score (IPSS; questions 1–7) ≥ 5 and a prostate-specific antigen (PSA) value < 4 ng/mL. Volunteers were randomized into groups of placebo (n = 12), G. lucidum of 0.6 mg (n = 12), 6 mg (n = 12) or 60 mg (n = 14), administered once daily. Efficacy was measured as a change from baseline in IPSS and the peak urine flow rate (Qmax). Prostate volume and residual urine were estimated by ultrasonography, and blood tests, including PSA levels, were measured at baseline and at the end of the treatment.

Results: The overall administration was well tolerated, with no major adverse effects. Statistical significances in the magnitude of changes between the experimental groups were observed at weeks 4 and 8. No changes were observed with respect to Qmax, residual urine, prostate volume or PSA levels.

Conclusion: The extract of G. lucidum was well tolerated and an improvement in IPSS was observed. The recommended dose of the extract of G. lucidum is 6 mg in men with LUTS.

Keywords: lower urinary tract symptoms, phytotherapy, outcome, randomized trial

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