EPPP Physiology Practice Exam

Traditional antipsychotics primarily function by blocking dopamine receptors, particularly the D2 subtype. This mechanism is crucial because an overactivity of dopaminergic pathways, specifically in areas like the mesolimbic system, is associated with the positive symptoms of schizophrenia, such as hallucinations and delusions. By inhibiting D2 receptors, these medications help reduce these psychotic symptoms.

The D2 receptor blockade is a hallmark of traditional antipsychotic action, making it effective in managing psychosis. It's important to note that this action can also lead to side effects related to dopamine pathways in other brain regions, which can contribute to movement disorders, known as extrapyramidal symptoms.

In contrast, newer antipsychotic medications might additionally target serotonin receptors, but traditional antipsychotics primarily rely on the blockade of dopamine receptors to exert their therapeutic effects.