Dryness of mouth caused by antipsychotic drug is caused by blockade of:
Xerostomia, commonly known as "dry mouth," is a repoed side effect of >1,800 drugs from >80 classes. ... Among all repoed side effects of antidepressants andantipsychotics, dry mouth often is the most prevalent complaint. For example, in a study of 5 antidepressants 35% to 46% of patients repoed dry mouth. Ref KD Tripati 8th ed.
Muscarinic ACh receptors
GABA receptors
Serotonergic receptors
Dopaminergic receptors
Central Nervous system