Teen tired all the time vyvanseTeen tired all the time vyvansefirst day he took Vyvanse(20mg, he became very tired . . . . . . . My 16 yr old daughter is taking VYVANSE 2x times a day 30 mg . ADHD Teens: Talking About ADHD: Choosing a Camp: ADD Dad . I was wondering though why you would be tired from taking Vyvanse. . . . . combination of these 2 meds helped my son all day, the only time . It lasted from eight in the morning . . on dexadrine and has become mean and angry all the time . In teen... more