A review of the treatment options for clozapine-induced hypersalivation

Aims and Method To develop and introduce an evidence-based drug treatment protocol for clozapine-induced hypersalivation, a review of published literature relating to clozapine-induced hypersalivation and its treatment was undertaken in March 2000. The databases searched were Medline, EMBASE and PsychLit, from 1966 to the present. Results This paper reviews the evidence of the benefit of using antimuscarinic agents, adrenergic antagonists and adrenergic agonists. There is alack of good-quality controlled-trials, with most papers reporting aseries of uncontrolled cases dependent on subjective measures of improvement reported by the patients. However, the published literature suggests a benefit for all of the drug categories reviewed. The most effective treatment may be acombination of terazosin and benzhexol. Clinical Implications Clozapine-induced hypersalivation is not only an embarrassing problem, but can be difficult to treat. An evidence-based prescribing protocol will encourage the use of those drugs found to be the most effective in treating this problem. It will also offer alternatives if acertain treatment is ineffective or intolerable.