[header] How to treat substance induced psychotic disorder [title] Identify what caused the psychosis. [step] It's important to recognize the cause of the psychosis to guide treatment. Psychosis can occur as a result of using or withdrawing from almost any substance, and it does not matter if the person used the substance for a long period or just a short time. 
If the psychosis occurs as a result of substance withdrawal, treatment should focus on withdrawal symptoms. If psychosis resulted from recreational drugs, it's important to identify what substances occur within the body to direct treatment.