Solifenacin as Add-on Therapy for Overactive Bladder Symptoms in Men Treated for Benign Prostatic Hyperplasia

Inclusion Criteria: * Patients with benign prostatic hypertrophy who have been treated with tamsulosin for at least 6 weeks * Patients with urgency episodes and frequent micturitions * Written informed consent has been obtained * Uroflowmetry-Q max ≥ 5 mL/sec, and Post Void Residual Volume \< 50 mL Exclusion Criteria: * Patients with suspected symptoms of OAB whose onset is only transient (drug-induced, psychogenic, etc.) * Patients with obvious stress urinary incontinence * Patients with complications or who have a past history of a bladder tumor * Patients with urethral stricture or bladder neck stenosis * Patients with a history of surgery causing damage to the pelvic plexus * Patients with history of hypersensitivity to α receptor blockers, a/b receptor blockers, or anticholinergic drugs * Patients with orthostatic hypotension, ulcerative colitis, hyperthyroidism, dementia or cognitive dysfunction, Parkinson's disease, or cerebrovascular disorder