Caffeine Side Effects In medicine, caffeine is known as trimethylxanthine. The chemical formula is C8H10N4O2. In pure form, caffeine is in the form of a white crystalline powder with a bitter taste. In medicine, caffeine is used as a heart stimulant and diuretic. So it is used to be called as an explosion of energy, or hyperactivity. Very often people consume caffeine to stay more alert and awake. There are even some who feel Caffeinesideeffects.com~Site InfoWhoisTrace RouteRBL Check