Efficacy of adding mirabegron to alpha-adrenoreceptor blocker in patients with benign prostatic hyperplasia with persistent overactive bladder symptoms: A prospective study

Purpose: To compare the efficacies of mirabegron 50 mg addition after alpha-adrenoreceptor blocker in terms of reducing storage symptoms in patients with BPH. Materials and Methods: Fifty-eight patients that had been taking alpha-adrenoreceptor blocker for more than 8 weeks, but had an OABSS of greater than 3 points, were initially enrolled. One group added any alpha-adrenoreceptor blocker with mirabegron 50 mg (n=39; the mirabegron group) and the other group received alpha-adrenoreceptor blocker only (n=19; the control group) for 8 weeks. Results: In the control group, mean total IPSS decreased from 15.7 to 13.1 (p=0.298) and in mirabegron group, mean total IPSS decreased from 19.4 to 16.5 (p=0.024). Mean storage symptom scores reduced in the control and mirabegron groups from 8.5 to 7.9 (p=0.584) and from 9.1 to 7.6 (p=0.015), respectively, and mean QoL scores from 3.7 to 3.1 (p=0.052) and 3.6 to 3.2 (p=0.027), respectively. Mean overall OABSS in the control and mirabegron groups reduced from 8.4 to 7.2 (p=0.173) and from 8.8 to 7.3, respectively (p=0.005); mean OABSS Q3 from 3.6 to 2.9 (p=0.073) and from 3.5 to 2.7 (p=0.002), respectively; and mean OABSS Q4 from 2.4 to 2.0 (p=0.306) and from 2.7 to 2.0 (p=0.016), respectively. The change of mean Qmax and PVR was insignificant in 2 groups. Conclusions: IPSS total scores, storage symptom scores, QoL, overall OABSS, OABSS Q3 and Q4 were more improved significantly by alpha-adrenoreceptor blocker with mirabegron 50 mg in BPH patients with persistent overactive symptoms. Mirabegron 50 mg addition is considered to patients with persistent storage symptoms after alpha-adrenoreceptor blocker.