The second visit was after 6 h from the administration of tamsulosin. UFM and PVR were measured. The third visit was after 1 month and the fourth visit was after 3 months, on which UFM, PVR, IPSS, and QoL were also measured. Results: The mean patients' age was 63 ± 6.18 and the mean prostate volume was 52.23 ± 24.59 cc..