"i was taking generic adderall 10 mg twice a day. i took it for a month and had a number of side effects that disappeared over time, except for 2 of them, increased excessive urination and stomach problems. so my doctor switched me to adderall xr 20 mg. the side effects are pretty much gone so far, i have been getting sour stomach, but i started a pretty good probiotic - 9 strains 50 billion bacteria- and it&#039;s helped some. i&#039;ve been on the xr for 3 days now. i can&#039;t say much for it being consistently effective though, it&#039;s also much more subtle as far as focus/concentration goes, and it seems to wear off much sooner than its supposed to, though it&#039;s hard to tell. i experience no crash at all. it&#039;s definitely much gentler than the ir version."