The scariest thing about speed nowadays is there is a high percentage of kids using it... LEGALLY! Yep, my son was included unfortunately! With his ADHD diagnosis came the drugs. We started with Methylphenidate which was supposed to be a short acting speed so he had to take it 3 times per day so you can imaging pumping a 13 year old child who is already hyper with 3 lots of speed every day, yes it ended in disaster! The depression you talk of happened every single day until the point where he was hospitalised due to threatening to take his own life! We quickly took him off this med. the next ADHD med they gave him was a blood pressure medication which gave him dizzy spells as his blood pressure droped to dangerous lows and he had to be taken off this too.
The final straw was Elvanse. This is a slow release version of speed. You take it in the morning and you stay high all day until about 18 hours later, when you crash and get the depression, and if you are lucky you can sleep for a couple of hours. We swiftly took him off the medication full stop and now manage his ADHD naturally, althugh social services were called in because I refused to drug my child...a whole other story and battle!
My husband decided to try the Elvanse after we decided to stop giving it to our son to see just what the drug did and yes it is as people suggest speed in a pharmaceutical quality with no added crap :/ I fear for the children of this generation...