Can psychosis result from anti-psychotic medication withdrawal for a non-psychotic patient? That is, a patient that takes anti-psychotic medication for off label reasons, such as treatment-resistant depression, or insomnia.
It depends on what you mean by psychosis.
Anti-psychotic medications effectively reduce the positive symptoms of schizophrenia (hallucinations, paranoia) at the expense of worsening the negative symptoms (rigidity, bradykinesia, cognitive slowing). Long-term use of antipsychotics, especially the older ones, can induce a Parkinson's-like syndrome.
These effects are not withdrawal so much as side effect of the medication.
Second generation antipsychotics are used as mood stabilizers in bipolar II and major depression. Post-marketing surveys of aripiperazole and the like have not bred rebound psychosis.
Use of dopamine agonists is associated with psychosis.