This document discusses antipsychotic medications used to treat psychosis. It describes typical and atypical antipsychotics. Typical antipsychotics like haloperidol and chlorpromazine work by decreasing dopamine levels in the brain through D2 receptor antagonism. Atypical antipsychotics decrease dopamine levels through D2 or D4 receptor antagonism and also act as serotonin receptor antagonists. Common adverse effects of antipsychotics include extrapyramidal symptoms, weight gain, and increased risk of diabetes or cardiovascular issues. The document provides details on dosage and side effects of specific atypical antipsychotics like risperidone, quetiapine, aripiprazole, clozapine, olanzapine, and