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vasopressin (va″zo-) (vas″o-pres´in) a hormone secreted by cells of the hypothalamic nuclei and then stored as a posterior pituitary hormone for release as necessary; it stimulates contraction of the muscular tissues of the capillaries and arterioles, raising the blood pressure, and increases peristalsis, exerts influence on the uterus, and influences resorption of water by the kidney tubules to cause concentration of urine. Its rate of secretion is regulated chiefly by the osmolarity of the plasma. Called also antidiuretic hormone.
a synthetic preparation of this hormone, obtained from the posterior pituitary of domestic animals, used as an antidiuretic.

arginine vasopressin vasopressin containing arginine, as that from humans and most other mammals; for medicinal uses, see vasopressin. Called also argipressin.

lysine vasopressin the antidiuretic hormone of the pig family, differing from arginine vasopressin in having lysine instead of arginine at position 8. A synthetic preparation, lypressin, is used as an antidiuretic and vasoconstrictor.

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