2-chloro-phenothiazine is an important intermediate in the synthesis of anti-psychotic, anesthetic, anticonvulsant and other pharmaceutical drugs. 2-chlorophenothiazine exerts no effect on cellular bioenergetics and do not inhibit glioblastoma cell proliferation. In the photo-micronucleus test using V79 cells, 2-chlorophenothiazine was identified as photogenotoxin.

Chlorpromazine pamoate (also known as chlorpromazine embonate) is a salt of pamoic acid and a chlorpromazine. Pamoate salts are used in pharmaceutical formulations because they show slow dissolution and are useful in formulations where extended duration of action is required. Chlorpromazine is a phenothiazine antipsychotic. It also exerts sedative and antiemetic activity. The precise mechanism whereby the therapeutic effects of chlorpromazine are produced is not known. It has a wide range of activity arising from its depressant actions on the CNS and its alpha-adrenergic blocking and antimuscarinic activities. Chlorpromazine is a dopamine inhibitor; the turnover of dopamine in the brain is also increased. There is some evidence that the antagonism of central dopaminergic function, especially at the D2-dopaminergic receptor, is related to therapeutic effect in psychotic conditions.