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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.
Maybe. Whether alcohol cause dilated pupils just depends on the amount of alcohol you drink. If you drink alcohol with mild to moderate amount, it just give a calming effect on the body. However, people who drink alcohol heavily or just have it with chronic use, it can stimulate the chemicals and hormones of your body due to the amount of alcohol in the bloodstream. That's why alcohol can cause dilated pupils.