Hey H.,
I would do some research on this medication and ask your psychatrist if they are prescribing zyprexa "off lable." I am not sure what the age levels are, but several years ago, it was only used off lable for children. Zyprexa has been involved in several law suits related to the development of diabetes and poor blood sugar regualtion. It is not usually the first line of medications presecribed for garden variety depression, and is used more often as an anti psychotic/ anti agression/ mood regulator (a mood disorder is entirely different from depression) This is my memory from when our autsitc daughter was on this briefly for agression. We could see the weight come on her body as she gained it, and she began to urinate huge amounts because her blood sugar went wacko, it also did not help her with aggresive behaviors. It was not a good drug for her.
I would be darn sure that you know what the symptoms are that this drug is supposed to be targeting, that you understand what disorder the symptoms are for the disorder he is dianosed with, and make sure that their is not a better choice. Do you trust the person who is prescribing for your son? Don't ever be afraid to ask a million questions and refuse to leave until you have all the answers you need.
M.