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Antipsychotic medications are divided into typical (first-generation) and atypical (second-generation) agents that primarily block dopamine receptors to treat psychotic symptoms. These medications are essential for managing schizophrenia, bipolar disorder, and other psychotic conditions by reducing hallucinations, delusions, and disorganized thinking.
Antipsychotics work primarily by blocking dopamine D2 receptors in mesolimbic pathways, reducing positive symptoms of psychosis. Atypical antipsychotics also have significant serotonin 5-HT2A receptor antagonism and varying degrees of histamine, alpha-adrenergic, and muscarinic receptor blockade, which contributes to their side effect profiles and therapeutic differences.
Selection between typical and atypical antipsychotics depends on efficacy needs, side effect tolerance, and individual patient factors such as metabolic risk and movement disorder susceptibility. Atypical agents are generally preferred first-line due to lower risk of extrapyramidal symptoms, though they carry higher metabolic risks including weight gain and diabetes. Monitoring includes assessment of therapeutic response, extrapyramidal symptoms, metabolic parameters, and potential cardiac effects.