ADHD
"I was recently diagnosed with ADHD and I was first prescribed Concerta. Since Concerta is part instant release and part extended release it starts working extremely quick, within 15-30 minutes, which was nice because there was no need to time things out when taking the medication. Unfortunately, Concerta starts working immediately and also stops working immediately which for me led a horrific crash. I was irritable and angry after the medication wore off. Due to this my doctor switched me to Vyvanse. Vyvanse is a prodrug which means the actual drug inside the capsule is not therapeutically helpful until it gets broken down in the body. This allows for a nice steady come up and no crash when the medication is eventually excreted."