Dutasteride Tablets 0.5 mg are used to treat benign prostatic hyperplasia (BPH) by reducing the size of the enlarged prostate. The medication works by inhibiting both type 1 and type 2 5-alpha reductase enzymes, which lowers dihydrotestosterone (DHT) levels—a hormone responsible for prostate growth. By decreasing DHT, dutasteride helps improve urinary symptoms such as difficulty in urination and reduces the risk of urinary retention.