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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
Vasoconstrictor drugs produce contraction of muscle cells in the walls of blood vessels.A very high level of alcohol in the bloodstream has a vasoconstrictor effect, as it shrinks the blood vessels and increases blood pressure.A vasoconstrictor drug, agent, or nerve causes vasoconstriction of the walls of blood vessels.