Vasopressin

How it works

Hits V1 receptors to constrict blood vessels and V2 receptors so the kidneys hold water: a drip to lift blood pressure in shock.

What it's made of

9 amino acids: arginine vasopressin, an exact copy of the human antidiuretic hormone. A sulfur bridge closes a ring of six.

What it's for

Prescribed for

To raise blood pressure in adults with vasodilatory shock when it stays low despite fluids and catecholamines.