I'm curious what could happen when students take adhd drug without prescription before an exam?

ADHD medications: If someone takes a stimulant (adderall, etc) who has not been diagnosed with adhd it gives a feeling of being invincible, hyper-attentive, on top of the world. And after all that you crash and feel worse than before taking the meds. Your body will want to feel good again so you take it again and before you know it Adderall (dextroamphetamine and racemic amphetamine) is not enough, you need crack or meth. My advice? Don't do it.