"been on this for about 3 months now.  at first it was great in keeping me focused on tasks at work and at home but it is starting to not be as effective i feel.  my dr. prescribed me the 18.8mg variety based on my weight and also because i am a gastric bypass patient as i digest and absorb things differently which is why we didn&#039;t go the more known route of adderall.  as i&#039;ve taken this medication, especially over the last month i&#039;ve noticed i have more anxiety, and i&#039;m not my normal happy go lucky self.  i have a follow up in april with my doc and will address these issues then to see what other game plan we can come up with.  i&#039;ve heard from a friend that also had gastric bypass that she takes vyvanse"