PROSTACIN-D 0.5/0.4 is a combination medication containing Dutasteride (0.5 mg) and Tamsulosin (0.4 mg), used to treat benign prostatic hyperplasia (BPH) in men. Dutasteride is a 5-alpha-reductase inhibitor that works by reducing the size of the enlarged prostate by blocking the conversion of testosterone into dihydrotestosterone (DHT), a hormone that contributes to prostate growth. Tamsulosin, an alpha-blocker, helps relax the muscles in the prostate and bladder neck, improving urine flow and relieving symptoms such as difficulty urinating, frequent urination, and urgency. The combination of these two medications provides a comprehensive approach to managing BPH, addressing both the enlarged prostate and the urinary symptoms. PROSTACIN-D is typically taken once daily, and it’s important to follow the prescribed dosage and consult a healthcare provider regarding potential side effects or interactions with other treatments.