Mepazine is primarily used in the field of psychiatry as an antipsychotic medication. It is effective in managing symptoms of schizophrenia and other psychotic disorders by helping to restore the balance of certain natural substances in the brain. Additionally, it can be utilized to alleviate severe anxiety and agitation in patients. Mepazine works by blocking dopamine receptors, which helps to reduce hallucinations, delusions, and disordered thinking. It is often prescribed when other treatments have not been effective, and its use is closely monitored due to potential side effects.