Tamsulosin + Dutasteride is a medication that is composed of two drugs: Tamsulosin and Dutasteride. Tamsulosin is a drug is also known as a selective alpha-1 adrenoceptor blocker. It blocks alpha-1 receptors in the prostate, urethra, and urinary bladder neck, leading to improved urinary flow in patients with benign prostatic hypertrophy (BPH). Dutasteride inhibits an enzyme that converts testosterone to 5α-dihydrotestosterone (DHT) known as 5 alpha-reductase.