Efficacy, Safety and Dose-response of Udenafil in Patients With Benign Prostatic Hyperplasia and Erectile Dysfunction

Inclusion Criteria: 1. Men ≥ 45 years of age. 2. Sexually active, with a stable female partner with whom the participant expects to have a relationship for the entire duration of the study. 3. The participant has benign prostatic hyperplasia with lower urinary tract symptoms (BPH-LUTS) according to clinical diagnostic criteria, with ≥ 6 months of evolution at the screening visit. 4. Clinical history of erectile dysfunction (ED) (defined as the inability to achieve or maintain the penile erection to achieve a satisfactory sexual relationship) of at least 3 months of evolution. 5. Freely given informed consent at the screening visit (an essential requirement to participate in the study). 6. Bladder obstruction defined by maximal flow rate (Qmax) of 4-15 mI/sec (with a premicturition volume of 150 to 550 mL evaluated by ultrasound, with a minimum micturition volume of 125 mL) at Visit I immediately prior to active treatment initiation. 7. Total score of ≥ 13 points in the InternationaI Prostate Symptom Score (IPSS) questionnaire at Visit 1, immediately prior to active treatment initiation. Exclusion Criteria: 1. Participants that are currently taking nitrates, antiandrogens, estrogens, luteninizing hormone-releasing hormone agonist/antagonist, or anabolic steroids at study entry. Participants that are taking a stable dose level of testosterone are not excluded. 2. Post-void residual (PVR) volume ≥ 300 mL, as assessed by ultrasound at the Visit 1. 3. Prostate-specific antigen (PSA) ≥ 10.0 ng/mL at the Visit 1. 4. PSA of 4.0 - 10.0 ng/ml if free PSA is \< 0,25 (25%) at Visit 1. 5. Clinical evidence of prostate cancer. 6. Glycosylated hemoglobin (Hb1Ac) \> 10 % at study entry. 7. Patients who have undergone bladder catheterization due to acute urine retention. 8. Medical history or clinical evidence of any pelvic, bladder or urinary tract condition, or urinary retention that, as judged by the urologist, might compromise protocol compliance. 9. Any surgical procedure in the lower urinary tract (including prostate biopsy) within 30 days prior to the Screening Visit.