It is a last resort med legally---you have to be registered to take it and you have to have tried other drugs first. The reason is the possibility of death. The US government wouldn't even approve it unless it was shown to be better than other antipsychotics because of that but it turns out that it is better. But its sounds like she's tried both atypical and typicals and clozapine is the only thing that's really different... its an atypical but has some sort of added aspect they can't figure out. Zyprexa was supposed to be like clozapine but without the risk of death but its not...its just doesn't work the same...