Although it made me a little jumpy and restless, so does caffeine so I didn't think much of it. Since I'm a runner and couldn't wait over a week to do anything, after a few day I tried to go on a short run. Really bad idea. I had extreme dry mouth, I was shivering, uncontrollably sweating, and got really dizzy. Once I stopped and sat down my body became so hot it felt like my shirt was on fire. I didn't feel better until much later and never plan to take this again.