Hi There, thanks for asking. That is true, you should take Vyvance regularly in order to avoid to be jittery or irritable. Attention deficit hyperactivity disorder
has another component which is "impulsivity". Many boys who have attention deficit hyperactivity also have impulsive behavior. For example, they may become aggressive toward their friend and they feel remorse soon after it. Vyvance is not only useful for your hyperactivity, but also helps you to manage your behavior. On the other hand, drug level fluctuation may change neuronal function and it is better to be used regularly. I wish you the best performance at school and in life.