International Neurourology Journal 2015;19:237-245 A Meta-Analysis of Long- Versus Short-Acting Phosphodiesterase 5 Inhibitors: Comparing Combination Use.

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International Neurourology Journal 2015;19: A Meta-Analysis of Long- Versus Short-Acting Phosphodiesterase 5 Inhibitors: Comparing Combination Use With α-Blockers and α-Blocker Monotherapy for Lower Urinary Tract Symptoms and Erectile Dysfunction Hoon Choi 1, Hyun Jung Kim 2, Jae Hyun Bae 1, Jae Heon Kim 3, Du Geon Moon 1, Jun Cheon 1, Jeong-Kyun Yeo 4 1 Department of Urology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea 2 Institute for Evidence-Based Medicine, The Korean Branch of Australasian Cochrane Center, Department of Preventive Medicine, Korea University College of Medicine, Seoul, Korea 3 Department of Urology, Soonchunhyang University Seoul Hospital, Soonchunhyang University School of Medicine, Seoul, Korea 4 Department of Urology, Inje University Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

INTRODUCTION Combination therapy with an α-1-adrenergic blocker and phosphodiesterase type 5 inhibitors (PDE5Is) has shown improvements in lower urinary tract symptoms (LUTS) with negligible side effects. Nonetheless, decisive advantages in symptom improvement were insufficient, and there were no clinical differences between long- or short-acting PDE5Is in combination with combination medication. International Neurourology Journal 2015;19:

To review the studies on α-1-adrenergic blocker monotherapy and combination therapy with long vs. short-acting PDE5Is in their use in LUTS and erectile dysfunction (ED). A search of the MEDLINE, Embase, Cochrane Library, and KoreaMed databases was conducted from 2000 to 2014 using combinations of the relevant terms. Among the 323 relevant references discovered, 10 were selected for meta- analysis. The data showed that 616 men received combination therapy (PDE5Is with α-1-adrenergic blockers) or α-1-adrenergic blocker monotherapy. MATERIALS AND MRTHODS International Neurourology Journal 2015;19:

RESULTS Meta-analysis of the combination therapy showed it was more effective than α-blockers in improving symptoms, with a mean International Prostrate Symptom Score change difference of –1.93 while those of the long- vs. short- acting PDE5I were –2.12 vs. –1.70. Compared to maximum flow rate (Qmax) value with monotherapy, the Qmax increased more with the combination therapy (mean difference of 0.71) while change values were 0.14 and 1.13 for the long- and short-acting PDE5Is, respectively. Residual urine decreased more with the combination therapy than it did with α-1-adrenergic blocker monotherapy with a mean difference of –7.09 while the mean residual urine change values for long- vs. short-acting PDE5Is were – vs. –5.93. The International Index of Erectile Function value increased by 3.99, 2.85, and 4.85 following combination therapy, and therapy with long- and short-acting PDE5Is. International Neurourology Journal 2015;19:

Our meta-analysis suggests that PDE5Is can significantly improve LUTS in men with benign prostatic hyperplasia/ED. Furthermore, combination PDE5I and α-1-adrenergic blocker could be a more effective treatment than α-1- adrenergic blocker monotherapy, and the differences between long and short-acting agents were minimal. CONCLUSIONS International Neurourology Journal 2015;19:

Table. 1. Individual research information included in meta-analysis Interna tional Neurourology Journal 2015;19: StudyStudy duration (wk)Combination of PDE5Is plus α-blockerNo.Alpha-blocker aloneNo.Jadad score Kaplan et al. (2007) [19]12Alfuzosin 10 mg/day + sildenafil 25 mg/day15Alfuzosin 10 mg/day153 Bechara et al. (2008) [20]6Tamsulosin 0.4 mg/day + tadalafil 20 mg/day15Tamsulosin 0.4 mg/day153 Liguori et al. (2009) [21]12Alfuzosin 10 mg/day + tadalafil 20 mg on alternative day23Alfuzosin 10 mg/day223 Tuncel et al. (2010) [22]8Tamsulosin 0.4 mg + sildenafil 25 mg 4 times/wk20Tamsulosin 0.4 mg/day202 Gacci et al. (2012) [23]12Tamsulosin 0.4 mg + vardenafil 10 mg30Tamsulosin 0.4 mg mg/day303 Ozturk et al. (2012) [24]12Alfuzosin 10 mg/day + sildenafil 25 mg/day50Alfuzosin 10 mg/day503 Regadas et al. (2013) [25]4Tamsulosin 0.4 mg + tadalafil 5 mg/day20Tamsulosin 0.4 mg/day203 Abolyosr et al. (2013) [26]16Doxazosin 2 mg + Sildenafil 50 mg/day50Doxazosin 2 mg/day503 Kumar et al. (2014) [27]12Alfuzosin 10 mg/day + tadalafil 10 mg/day25Alfuzosin 10 mg/day252 Singh et al. (2014) [28]12Tamsulosin 0.4 mg/day + tadalafil 10 mg/day44Tamsulosin 0.4 mg/day453 Total4 to12 292

Interna tional Neurourology Journal 2015;19: Fig. 1

Fig. 1. Flowchart of literature search and protocol completion for studies on long- vs. short-acting phosphodiesterase type 5 inhibitors combined with α1- adrenergic-blocker vs. α-adrenergic blocker alone. Interna tional Neurourology Journal 2015;19:

Fig. 2

Fig. 2. Weighted differences with 95% confidence interval (CI) of International Prostate Symptom Score between phosphodiesterase type 5 inhibitors (PDE5Is) plus α-1-adrenergic blocker (experiment ) vs. α-1- adrenergic blocker alone (control). SD, standard deviation;df, degrees of freedom; IV, inverse variance. Interna tional Neurourology Journal 2015;19:

Fig. 3

Fig. 3. Weighted differences with 95% confidence interval (CI) of International Prostate Symptom Score between phosphodiesterase type 5 inhibitors (PDE5Is) plus α-1-adrenergic blocker (experiment ) vs. α-1- adrenergic blocker alone (control). SD, standard deviation;df, degrees of freedom; IV, inverse variance. Interna tional Neurourology Journal 2015;19:

Fig. 4

Fig. 4. Weighted differences with 95% confidence interval (CI) of residual urine between phosphodiesterase type 5 inhibitors (PDE5Is) plus α-1- adrenergic blocker (experiment) vs. α-1-adrenergic blocker alone (control). SD, standard deviation; df, degrees of freedom; IV, inverse variance. Interna tional Neurourology Journal 2015;19:

Fig. 5

Fig. 5. Weighted differences with 95% confidence interval (CI) of International Index of Erectile Function score between phosphodiesterase type 5 inhibitors (PDE5Is) plus α-1-adrenergic blocker (experiment) vs. α-1- adrenergic blocker (control). Interna tional Neurourology Journal 2015;19: