The three phenothiazine sub-families are Aliphatic derivatives, Piperidine derivatives, and Piperazine derivatives. The aliphatic and piperidine derivatives have low potency and cause severe sedation, anticholinergic effects, postural hypotension, and they are cardiotoxic. The Piperazine derivatives have high potency, but it causes a weaker anticholinergic effect and less sedation, less cardiovascular effects, and does not cause postural hypotension.
Antipsychotics block D2- receptors as well as H1-receptors, cholinergic receptors, and alpha1-receptors. (> alpha 1 receptors)