NCIt definition : A dibenzoxepin derivative and tricyclic antidepressant with antipruritic and sedative
activities. Doxepin blocks the reuptake of norepinephrine and serotonin into presynaptic
terminals thereby prolonging the availability of the monoaminergic neurotransmitters
within the synaptic cleft and enhancing their action leading to sedative effects.
Doxepin also has antagonistic effects on histamine (H1 and H2), 5-HT2, alpha-1 adrenergic,
and muscarinic receptors. The antipruritic effect of this agent is the result mediated
through inhibition of histamine receptors.;