"i&#039;ve only been on this for 4 days now and so far i&#039;ve had nothing but side effects. although it&#039;s partially my fault. my doctor never warned me about iburophen or caffeine. i had a headache so i took something for it and it just made the effects so much worse. i then took an energy sports drink before the gym and overdosed on caffeine. i was awake for 64hrs before finally getting any sleep and that only lasted 4 hours. but i must say i was a lot more alert, my eyes were tired but my brain wasn&#039;t. other side effects i&#039;ve had are severe shakiness, dry mouth, nausea, diarrhea, loss in appetite, yawning, teeth grinding, ear popping. i&#039;m going to stick with it to see the outcome."