<unk>  is part of a series of antihistamines including pheniramine (Naphcon) and its halogenated derivatives and others including fluorpheniramine, chlorpheniramine, dexchlorpheniramine (Polaramine), triprolidine (Actifed), and iodopheniramine. The halogenated alkylamine antihistamines all exhibit optical isomerism;<unk>  products contain racemic<unk>  maleate ,whereas dexbrompheniramine (Drixoral) is the dextrorotary (right-handed) stereoisomer.<unk>  is an analog of chlorpheniramine. The only difference is that the chlorine atom in the benzene ring is replaced with a bromine atom. It is also synthesized in an analogous manner.
Brompheniramine
Nicergoline
Cabergoline
Bupranolol
Agomelatine
Beclamide
Clonidine
Avacopan