Brain Blogger has a list of 5 common myths concerning the prescribing of psychotropic drugs for children and adolescents... here's the quick countdown...
1. children are little adults (clearly there are differences in physiology as well as psychology)
2. children have no reason to develop depression or anxiety (tell that to the bullied as well as the bully)
3. psychiatric disorders are the same in children as they are in adults (there may be some overlap, but these are largely different)
4. children can be prescribed the same drugs as adults just in smaller doses (again there may be some, but in most cases there simply isn't enough research to know whether or not this is ok for most drugs)
5. drugs are successful at treating psychiatric disorders (while there are many drugs that show some efficacy, they should not be considered a cure-all, and in some cases, drugs can do more harm than good)