Vasopressin, also known as vasopressin, haparin, angiotensin, is a polypeptide composed of 8 amino acids extracted from the posterior lobe of mammalian pituitary gland; , contraction of small
arteries and capillaries to increase blood pressure, stop bleeding and stimulate the role of colon and bladder smooth muscle. Clinically, it is often used for hemostasis, surgical shock, intestinal
paralysis, bladder paralysis and diagnosis of central diabetes insipidus in patients with diabetes insipidus and acute bleeding of esophageal varices.