Vasopressin in 0.9% Sodium Chloride Injection Vials, 20 Units Per 100 mL, 10/Box (RX)Vasopressin in 0. 9% Sodium Chloride Injection Vasopressin in 0. 9% Sodium Chloride Injection is an IV vasopressor solution (a synthetic form of the hormone arginine vasopressin) premixed in normal saline. It comes in sterile 100 mL bags containing either 20 units or 40 units of vasopressin (i. e. 0. 2 U mL or 0. 4 U mL). This ready to use infusion raises blood pressure by constricting blood vessels (vasoconstriction), since vasopressin binds V1