Please do this soon because if it is Schizophrenia, your sister would benefit from early treatment. The earlier Schizophrenia is treated, the better the outcome. Take care, and let's stay in touch. I have a son who is 29 and was just recently diagnosed as schizophrenic, brought on by use of drugs. I am wondering what drug would be the most effective in treating him with the minimum of side effects.
Different antipsychotics works differently on people with Schizophrenia.
However, it is usually the case that the psychiatrist will put your son on one of the newer antipsychotics. I cannot really answer your question because, like I said, different antipsychotics works differently on different people. Your son may or may not respond to the first antipsychotic that he is on. If he does not respond, the psychiatrist may put your son on a different medication. If your son does respond, then his psychiatrist most likely will keep your son on that antipsychotic.