Pimethixene maleate (Pimetixene maleate) is a potent 5-HT2B receptor antagonist with sedative and antitussive activity.Pimethixene maleate inhibits 5-HT1A, 5-HT2A, 5-HT2B, 5-HT2C, histamine H1, dopamine D2 and D4.4 as well as muscarinic M1 and M2, and can be used in studies of dry and irritant cough in children. irritant cough in children.