<prompt> The mechanism of action of haloperidol is the blockage ofSerotonin receptorGABA receptorDopamine receptorAdrenergic receptor  <response>: C Dopamine receptor Haloperidol, Trifluperidol, Droperidol, Penfluridol are Butyrophenones and act as antipsychotic drugs. All antipsychotic except clozapine like have potent dopamine D2 receptor blocking action. So, it is clear that Haloperidol act by blocking dopamine receptor. Uses of haloperidol are in acute schizophrenia, Huntingtons disease. Clozapine has significant 5-HT2 and at blocking action. Dopaminergic blockade in basal ganglia cause extrapyramidal sign while that in CTZ is responsible for antiemel action. 