Vasoconstrictor or pressor medications help relieve low blood pressure and other symptoms. These drugs may be used to raise blood pressure when someone is in shock, has excessive bleeding, or has a severe allergic reaction.

What does vasoconstriction do to the heart?

Vasoconstriction is the opposite of vasodilation. Vasoconstriction refers to the narrowing of the arteries and blood vessels. During vasoconstriction, the heart needs to pump harder to get blood through the constricted veins and arteries. This can lead to higher blood pressure.

What happens when blood vessels are constricted?

When blood vessels constrict, the flow of blood is restricted or decreased, thus retaining body heat or increasing vascular resistance. This makes the skin turn paler because less blood reaches the surface, reducing the radiation of heat.