Dutas is a mix of two medicines: dutasteride and tamsulosin hydrochloride. The drugs have complementary mechanisms of action, due to which there is a rapid weakening of urination. It reduces the risk of retention of the urine. It is not anticipated that the pharmacodynamic reactions of a fixed dosage mix of dutasteride-tamsulosin differ from those obtained with the simultaneous use of dutasteride and tamsulosin as separate elements. Dutasteride inhibits the activity of both the 1st and 2nd type of isoenzymes. DHT is an androgen that is responsible for prostate and the increase of BPH. It inhibits the activity of adrenoreceptors.