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Antidiuretic hormone (ADH), also called arginine vasopressin (AVP), is secreted by the posterior pituitary gland. mainly in the kidneys It has an antidiuretic effect by increasing water reabsorption and increases blood pressure by constricting blood vessels when secreted in large quantities. When body fluid volume is insufficient or osmotic pressure increases, ADH is secreted. Pathologically, when the quantity or function of ADH is decreased, diabetes insipidus occurs, and in the opposite case, the syndrome of inappropriate secretion of antidiuretic hormone (SIADH) occur