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Introduction: We evaluated the factors associated with secondary hemorrhage after bipolar transurethral resection of prostate (TURP) and vaporization of prostate. Materials and Methods: The perioperative data of patients undergoing endoscopic surgery for benign prostatic hyperplasia (BPH) were prospectively collected. Procedures involved included bipolar TURP, bipolar vaporization of prostate, and hybrid bipolar TURP/vaporization of prostate. Secondary hemorrhage was defined as bleeding between 48 h and 30 days postsurgery requiring hospital attendance with or without admission. Risk factors for secondary hemorrhage were analyzed. Results: From 2010 to 2013, 316 patients underwent bipolar surgery for BPH. Bipolar TURP accounted for 48.1% of the procedures, bipolar vaporization accounted for 20.3% of the procedures, and the rest were hybrid TURP/vaporization of prostate. Among this cohort of patients, fifty patients had secondary hemorrhage with hospital attendance. Consumption of platelet aggregation inhibitors (PAIs) was found to be associated with secondary hemorrhage (P < 0.0005). Age, prostate volume, operation type, the use of 5-alpha reductase inhibitors, and being with a urethral catheter before operation were not found to be statistically significant risk factors for secondary hemorrhage. Conclusions: Secondary hemorrhage after bipolar surgery for BPH is a common event. Consumption of PAI is a risk factor for such complication.