Clozapine-induced hypersalivation

OBJECTIVE: To review underlying pathophysiology and possible treatments for clozapine-induced hypersalivation. DATA SOURCES: Primary literature was accessed through MEDLINE (1966-May 1999). Key search terms included clozapine, hypersalivation, sialorrhea, and treatment. DATA SYNTHESIS: Hypersalivation occurs in up to 54% of patients receiving clozapine. An evaluation of studies and case reports focusing on management of clozaine-induced hypersalivation was conducted. CONCLUSIONS: It is unclear whether clozapine increases salivation through its muscarinic M4 receptor activation and/or blockade of alpha 2-adrenoceptors, or by causing a distortion in swallowing reflex. Treatment options include chewing gum, reducing the dosage of clozapine, or prescribing pharmacologic agents such as anticholinergics or alpha(2)-adrenoceptor agonists.