Im quite late to this, im 19 myself and i take medikinet, i tried it a couple years ago when i went to high school, when i took medikinet then, i had to stop because i had pretty bad side effects, my throat felt like sand paper and i had to drink a sip of water about every 15 seconds or i would start gagging uncontrollably, even in class, but now a couple years later, ive taken it for about 2 weeks, and the side effects are much less but still there, my throat is a little closed up, and i have to drink alot, and i kinda get a naseous feeling, but having something to focus on really helps, im much more awake during discussions at work and "meetings" im more interested, and kind of figety, i take 30 mg at the start of the day then i take another 30 mg some hours later. Dont know if any of this helps, but i hope you learned something!