In the wake of an Ohio teen’s overdose on powdered caffeine, the federal Food and Drug Administration has been ringing alarm bells about the product’s dangers, urging consumers to avoid it. Logan Stiner, 18, a Cleveland-area high school senior, wrestler and prom king on the verge of graduating, took what proved to be a fatal amount of powdered caffeine May 27 at his family’s home. Because it is nearly impossible to accurately measure powdered pure caffeine, a consumer can easily ingest a lethal amount. Just one-sixteenth of a teaspoon of powdered caffeine equals about two cups of strong coffee. Related: Pure Caffeine Can Be Deadly Symptoms of caffeine overdose include a rapid or dangerously erratic heartbeat and seizures that can result in death. Vomiting, diarrhea, stupor and disorientation are also signs of caffeine toxicity. These symptoms are likely to be much more severe than those resulting from drinking too much coffee, tea or other caffeinated beverages.