I take 20mg Methylphenidate every 3-4 hours, as per the doctors instructions. Accidentally took 20mg only 2 hours apart. If I understand correctly, this means that when it kicks in, I should feel the effects of approximately 30mg ingested at once. This is a dose I ve been on before. It produced some side effects (restlessness, euphoria) but not necessarily a dangerous amount, simply undesirable for treating ADD. Should I be worried or just ride it out ?