Is alcohol a vasodilator or vasoconstrictor?

Answer 1

alcohol is a vasodilator at lower doses but at higher doses it acts as a vasocontrictor. (1)

caffeine is a vasoconstrictor. hence the help you receive from drinking coffee with aspirin after getting a headache related to drinking alcohol.

(1) - http://www.scientificamerican.com/article.cfm?id=what-are-the-effects-of-a

As a general guideline, most stimulants will act as vasoconstrictors and most depressants will act as vasodilators. There are obvious exceptions to this rule (such as NO2)

Answer 2

Caffeine has vasoconstriction properties.

http://en.wikipedia.org/wiki/Caffeine

Answer 3

Is coffee a vasodialator or a vasoconstrictor?

Answer 4

No, actually caffeine is a vaso-constrictor, yet at the same time is a vasodiolator to the lungs. In short it is not a vaso-diolator for the primary blood vessels!