Maprotiline at Histamine H1, Adrenergic α1, and Muscarinic receptors

The listed targets—Histamine H1 receptor, Alpha-1 adrenergic receptor, and Muscarinic acetylcholine receptor—are all G protein-coupled receptors present in the central and peripheral nervous system. Maprotiline, a tetracyclic antidepressant, produces its therapeutic and side effects largely through antagonism at these receptors, alongside potent inhibition of norepinephrine reuptake. This multi-modal profile explains its antidepressant, anxiolytic, sedative, and sympatholytic properties, as well as typical TCA-type side effects including sedation, anticholinergic symptoms, and potential cardiovascular impacts[1][3][7][9].

Other names

H1RHRH1α1-ARADRA1Muscarinic receptormAChR

Histamine H1 receptor: Antagonism (inhibition of histaminergic activity; sedative, anti-allergy effects); Alpha-1 adrenergic receptor: Antagonism (reduces vasoconstrictive effects; may lower blood pressure, cause orthostatic hypotension); Muscarinic acetylcholine receptor: Weak antagonism (may cause anticholinergic effects such as dry mouth, blurred vision)