"when i first started on vyvanse (30 mg) i thought it was a miracle.  i was social, energetic, and losing a lot weight.  after about 6 months on it (40 mg) things started to change, i began having horrible crashes where i would experience depression, ocd type behavior, and thoughts of suicide.  trying to get off it it brought about terrible withdrawal symptoms; i gained a lot of weight, was lifeless, and extremely depressed.  i really wish i never started this drug. i noticed a lot of people loving this drug have only been on it for a short amount of time, so come back and update your review when you have taken it for 6 months to a year.  the rebound affect of stopping it has been awful."