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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.
Alcohol intoxication can be harmful for a variety of reasons, including: 1  Impaired brain function resulting in poor judgment, reduced reaction time, loss of balance and motor skills, or slurred speech. 2  Dilation of blood vessels, causing a feeling of warmth but resulting in rapid loss of body heat.