Azaphen dihydrochloride monohydrate is a tricyclic antidepressant that inhibits the reuptake of serotonin and monoamines, regulates the 5-HT2c receptor, and exerts sedative, antidepressant and anxiolytic effects. Azaphen dihydrochloride monohydrate increases the bioavailability of serotonin in the synaptic cleft, does not block muscarinic receptors or affect monoamine oxidase activity, and binds to the human serotonin transporter via salt bridges, π-stacking, π-cation and hydrophobic interactions. Azaphen dihydrochloride monohydrate can be used in studies related to depression.