Objective. To evaluate the effects of short term use of dutasteride and Serenoa repens before transurethral resection of the prostate (TURP) on the amount of intraoperative blood loss and microvessel density (MVD) of prostatic stromal and suburethral tissues in the patients with benign prostatic hyperplasia. Patients and methods. The study involved 75 male patients who planned to have a TURP. The patients were randomly divided into three groups. The control group comprised 21 patients. Group 2 comprised 27 patients who used dutasteride 5 mg/day, and group 3 comprised 27 patients who used S. repens 160 mg/day for 5 weeks before the operation. The amount of intraoperative haemorrhage was calculated. Total blood loss, total blood loss/time, total blood loss/weight of resected tissue and total blood loss/weight/time were calculated for each patient and all were recorded. Sections from the prostatic stromal and suburethral tissues were examined for suburethral and prostatic MVD. Results. The total amount of intraoperative blood loss, total blood loss/time, total blood loss/weight of resected tissue, total blood loss/weight/time, serum haemoglobin level change, prostatic MVD and suburethral MVD of the groups were compared. No significant statistical differences were found between the groups for any of these variables (p>0.05). Conclusions. Dutasteride and S. repens therapies were not superior to control in terms of the decrease in total blood loss during TURP. Moreover, MVD showed no statistical differences in the treatment groups compared with the control group.