NCIt definition : The hydrochloride salt form of promazine, a phenothiazine derivative with antipsychotic
and antiemetic properties. Promazine hydrochloride blocks postsynaptic dopamine receptors
D1 and D2 in the mesolimbic and medullary chemoreceptor trigger zone (CTZ), thereby
decreasing stimulation of the vomiting center in the brain and psychotic effects,
such as hallucinations and delusions. In addition, this agent blocks alpha-adrenergic
receptors and exhibits strong anticholinergic activity.;