if you drank 70 cups of coffee the amount of caffeine could easily kill you but just a few teaspoons of caffeine powder can be even more dangerous you see a single teaspoon of caffeine powder is equivalent to about 28 cups of coffee in 2019 a man accidentally mixed in too much of this powder in his drink it was the equivalent to 200 cups of coffee this led to his heart beating extremely fast he started foaming at the mouth before eventually dying