I'm prescribed Ritalin (Methylphenidate) for my ADHD to aid with concentration in college. After taking my dose (10 mg) I'll experience the usual euphoria and concentration effects of the drug followed by a moderate 2-3 hour comedown. However after the comedown I'll start feeling the euphoric rush again but without re dosing. This euphoric can persists up to two full days without re dosing!! Yesterday I took 30 mg in the evening and woke up today in a very good mood The effects have lasted all day with no sign of any change. At one point I didn't take the drug for half a month and noticed the euphoria lasted an entire week and never really went completely away. Now of course I'm not complaining! but this has made me question if this is a typical effect of the drug? I've found the more intense the comedown is, the longer this long term euphoria lasts. Is this a normal response to the drug?