"i have been taking vyvanse 4mg for a month and my productivity in my work and school have increased measurably. i have taken several different adhd medicines through a period of several years, and vyvanse is by far the most effective. it hasn&#039;t caused me any of the side effects caused by most adhd medicines (paranoia, restlessness, agitation, lack of appetite). of course these are just my experiences, but i would recommend vyvanse to others."