ADH, Antidiuretic Hormone, Vasopressin

ADH inhibits diuresis by enhancing renal water reabsorption in the kidney collecting tube. ADH or vasopressin plays an important role in the regulation of osmotic pressure and fluid volume in the body. It concentrates urine by increasing the recovery of water from primary urine. It is excreted mainly at night and helps to sleep through the night without the need to urinate.

ADH is formed in the hypothalamus, transported to the posterior lobe of the pituitary gland and released into the bloodstream by various regulatory mechanisms.
ADH has an antidiuretic effect by promoting water reabsorption in the distal tubules as well as in the collecting tubes of the kidney. This causes the body to lose as little water as possible. The vasopressor effect of ADH leads to arterial vasoconstriction and thus to an increase in blood pressure. The ADH distribution is controlled within the framework of the osmoregulatory system.

https://en.wikipedia.org/wiki/Vasopressin

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