"works like a charm.  it has significantly helped me with concentration- whether sitting in a lecture or retaining my train of thought, restlessness, and some impulsiveness.  one thing- for me, mixing with caffeine is a no-no, as it makes me jittery and shaky.  but i can do a half-caf coffee. only negative things: tolerance does develop over time, unfortunately; it only lasts up to 12 hours, and as a student, i&#039;m up early and go to bed late, so i take a 10mg methylphenidate tablet 40 minutes before or after dinner to keep me focused for a bit longer.  around 1 am though, i get pretty restless."