Mechanism of action
Postulated that it blocks dopamine receptors in CNS. Other pharmacological actions seen in varying degrees include cholinergic, adrenergic, histaminergic and serotonergic blocking activity. The exact mechanism of its action is unknown. When administered to normal person it causes emotional quietening, indifference to surroundings and sedation. When given in psychotics it decreases agitation, aggressiveness and tend to bring behaviour towards normality. Its administration may cause movement disorders.