In order to determine whether the diagnosis of a psychotic disorder is warranted, the health care professional has to first consider if a medical illness may be the cause of the behavioral changes. If a medical disease is identified or the psychosis is found to be the result of exposure to a medication or drug, the sufferer is assessed as having psychotic disorder due to a medical condition or psychotic disorder due to toxin exposure or withdrawal, respectively. On the other hand, if a medical cause and toxin exposure have been looked for and not found, a psychotic illness such as schizophrenia could be considered. The diagnosis will best be made by a licensed mental-health professional (like a psychiatrist or clinical psychologist), who can evaluate the patient and carefully sort through the diagnostic criteria for a variety of mental illnesses that might look alike at the initial examination, like schizotypal or schizoid personality disorder or a mood disorder with psychotic features like severe depression , or the mania phase of bipolar disorder. Other health care professionals who may treat psychotic disorders may include licensed social workers, psychiatric nurses and nurse practitioners, mental health physician assistants, and sometimes non-psychiatric physicians.
Fluphenazine came into use in 1959.  The injectable form is on the World Health Organization's List of Essential Medicines , the most effective and safe medicines needed in a health system .  It is available as a generic medication .  In the United States the tablets costs between and USD per day for a typical dose.  The wholesale cost in the developing world of the long acting form is between and USD per injection as of 2014.  It was discontinued in Australia around mid 2017. 
NAMI has recently started endorsing the Partnership
for Prescription Assistance , a new program that seeks to boost
enrollment in existing Patient Assistance Programs by helping consumers
identify and apply for programs for which they may be eligible. This
may be a good place to start if you are unfamiliar with Assistance
Programs that might work for you - however, we don't yet know how
successful the Partnership is at enrolling people in good programs,
or how much they may charge for their service. If anyone has experiences
to share about the Partnership for Prescription Assistance (good or
bad), please email the administration at: szwebmaster@.
Visit their website ( http:// ) or call 1-888-477-2669 if you are interested.
Free information sites about PAPs - include databases searchable by state, medication, or company name