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Cirrhosis: Vasoconstrictor Medicines for Variceal Bleeding. Cirrhosis: Vasoconstrictor Medicines for Variceal Bleeding. Medicines that constrict small blood vessels and reduce blood flow to the portal vein are used to treat sudden (acute) bleeding from enlarged veins (varices) in the digestive tract (variceal bleeding). Octreotide is the main medicine used in the United States to treat variceal bleeding.
Generalized vasoconstriction usually results in an increase in systemic blood pressure, but it may also occur in specific tissues, causing a localized reduction in blood flow.The extent of vasoconstriction may be slight or severe depending on the substance or circumstance.or example, vasoconstriction is a hypothermic preventative in which the blood vessels constrict and blood must move at a higher pressure to actively prevent a hypoxic reaction. ATP is used as a form of energy to increase this pressure to heat the body.