Zyprexa is an atypical antipsychotic prescription drug. It is an atypical antipsychotic because it affects the nervous system in a manner different than a simple tranquilizer and has less side effects than other medications in its class (credits to the user deep thought for that tidbit).

used to treat schizophrenia, psychotic disorders, and "thought" disorders. Sometimes MPD (DID) patients are put on small doses to minimize the switching.

5 mg doses are the lowest possible dose. I've known hardcore schizophrenics to be on as much as 40 mg, although anything over 15 mg is a lot, and usually only schizophrenics get medicated that much.

Weight gain and decrease in energy is a very common side effect (regardless of what some doctors say), as this drug is in the same class as thorazine.