Vasopressin is a hormone that stimulates contraction of muscle tissues of capillaries and arterioles, and exerts some influence on uterine contraction. It causes conservation of water and raises blood pressure. Desmopressin, a synthetic form of the human hormone vasopressin, limits the amount of water eliminated in the urine. It can be administered nasally, via IV, orally, or given as a sublingual tablet. Major uses of desmopressin include bed-wetting, nighttime urination, clotting disorders, and diabetes insipidus.