how long does it take for an energy drink to take effect
Caffeine From the First Sip. Caffeine easy passes through body membranes so from the first sip the caffeine is entering your bloodstream through the lining of your mouth, throat, and stomach. Advertisement. It only takes 45 minutes for 99% of the caffeine to be absorbed through these membranes.In humans the half-life for caffeine is anywhere from 4 to 6 hours on average, which explains why the average energy drink or coffeeâs effect lasts about 4 to 6 hours.affeine From the First Sip. Caffeine easy passes through body membranes so from the first sip the caffeine is entering your bloodstream through the lining of your mouth, throat, and stomach. Advertisement. It only takes 45 minutes for 99% of the caffeine to be absorbed through these membranes.