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A member asked:
Help please! is caffeine a vasodilator or vasoconstrictor?
A doctor has provided 1 answer
Caffeine is...: Caffeine has a near-identical chemical structure as theophylline, a well known bronchodilator. As for the vasculature, caffeine typically vasoconstricts the peripheral vasculature as reflected in increased systolic & diastolic pressure, but not cardiac output or left ventricular contractility. Caffeine also blocks (inhibits) Adenosine in the brain--this is what keeps you awake...
Answered 1/17/2021
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