Six cans of Red Bull is about 480mg caffeine (assuming six 250ml cans at 32mg/100ml caffeine). Not exactly recommended (and may be unpleasant), but it shouldn't

Six cans of Red Bull is about 480mg caffeine (assuming six 250ml cans at 32mg/100ml caffeine). Not exactly recommended (and may be unpleasant), but it shouldn't be a serious risk to the average person either (it's about the same as three strong cups of coffee).