HTR2C and Decreased total neutrophil count: Moreover, it has an affinity for serotonergic 5-HT2A and 5-HT2C, which may explain the very low does (6.25–37 mg) used in PD.145 It is, however, important to perform regular blood cell monitoring, as clozapine has a very low risk of severe neutropenia and agranulocytosis and a low risk of mild and moderate neutropenia.162 Nevertheless, clozapine is the most efficacious drug for the treatment of hallucinations and psychosis in PD and is likely underused in most countries.160