"i wouldn&#039;t typically give any drug such a high rating, but vyvanse has truly changed my life with few if any side effects. i take 20 mg once a day, and it lasts 12 to 14 hours. it took about 2 weeks of trial and error to find the dosage, but it was very worthwhile. i am happier, less anxious, and significantly more organized than i have ever been. i am a student and many areas of my life--academics, social functioning, general health, etc.--have all improved greatly. the inattentive fog has cleared, and i finally feel able to create the life i want to be living. better control over my life has also given me back self-esteem and stabilized my moods. i am so grateful."