Who take what? How does it work? I'll go first... I used to take 30mg of Adderall IR twice a day but recently my new doctor switched me to 30mg XL Focolin Once per day. ER never work for me I do not know why. The Focolin doesn't work at all, not even a little. It doesn't even fell like I took anything. The reason I switched is because sometimes my adderall was making me tired. Sometimes it worked and sometimes it didn't. I felt like I built immunity to it. I'm going to see if she can swing me back.