Levomepromazine Maleate is a Tricyclic antidepressant (TCA), acting as a serotonin–norepinephrine reuptake inhibitor (SNRI) and also having other activities including antihistamine, antiadrenergic, antiserotonergic, anticholinergic, and sodium channel-blocking effects.
Levomepromazine HCl is a phenothiazine with pharmacological activity similar to that of both CHLORPROMAZINE and PROMETHAZINE. It has the histamine-antagonist properties of the antihistamines together with CENTRAL NERVOUS SYSTEM effects resembling those of chlorpromazine.