Dutas Capsule is used to treat benign prostatic hyperplasia (overgrowth of the prostate gland, a gland situated between the bladder and penis). It contains Dutasteride, which blocks an enzyme that is needed to change testosterone (male hormone) to another hormone that causes the growth of the prostate gland. As a result, it helps to shrink the prostate and reduce the symptoms like difficulty in passing urine. It may cause side effects such as low sexual desire, allergic reaction, and impotence (inability to get and keep an erection firm sufficient for sex). Before taking this medicine, you should tell your doctor if you are allergic to any of its components and about all the medications you are taking and pre-existing medical conditions