I realize that there are parents on this thread, and out in the world, who don't know what else to do with difficult children. But getting them addicted to hard drugs isn't the only or best choice. Look at the motives of the a) drug companies b) doctors who get to be important and have repeat patients c) teachers who can have drugged kids in their classes and d) some parents who then don't have to deal with the difficult children and maybe change how they are raising them.
And I don't mean to insult any parents here - I know that raising children is one of the most difficult challenges in the world, and one of the most important. One thing to think about is that government schools are actually an ineffective way to teach kids. They are basically indoctrination centers, their purpose is not to bring out the best in children. I am sure there are good teachers or administrators here and there, but the majority are liberals, and many of the administrators draw big salaries, keep their chairs warm, and schools are notoriously top heavy.
Some children are not very scholarly - they need to be learning other skills. The whole idea that every kid needs to go to college is a one size fits all concept that is not realistic. Some kids need more physical activity - especially kids that are so-called ADD. Some children need more time one on one with adults, or some time not in a gang of same age kids all the time.
Some kids are very sensitive to junk food, artificial ingredients and a huge sugar intake. Monosodium glutamate(often called "flavoring" or even "natural flavor") can damage brain function. Changing diet can help most kids.
Another factor is TV watching. Kids that watch a lot of TV and play a lot of video/computer games can have a lot of problems - due to lack of physical activity, lack of interaction with humans, and also the effect of all that stuff (content and media itself) going into the brain is very deleterious.
There are many alternatives to drugs, but they all take work and often changes on the part of the adults around the children.