Well Ibuprofin isn't aspirin... it's Ibuprofin. One of my co workers is perscribed (yes, she needs a script for it) 800mg Ibuprofin ER. All I know is when she takes it during work, she never stops laughing and you can tell she's slightly doped up lol. She even gave one to my supervisor when he had a headache, he took the whole thing and 40 minutes later couldn't get a smile off his face. But then again 800mg can be an OD for people without any tolerance, so don't even bother.