Caffeine is a diuretic (meaning that it causes you to produce more urine). It doesn't help your hydration levels if you drink something, and then immediately u

Caffeine is a diuretic (meaning that it causes you to produce more urine). It doesn't help your hydration levels if you drink something, and then immediately urinate it back out. That said, if you're past risk of dehydration, it probably doesn't make that much difference.