Treatment of Clozapine-Induced Hypersalivation With Ipratropium Bromide: A Randomized, Double-Blind, Placebo-Controlled Crossover Study
J Clin Psychiatry 2009;70(8):1114-1119
© Copyright 2015 Physicians Postgraduate Press, Inc.
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Objective: Clozapine-induced hypersalivation (CIH) occurs in up to 57% of treated patients and can be the source of considerable subjective distress. Previous open-label studies suggest that sublingual ipratropium bromide may be effective
in treating CIH.
Method: We conducted a randomized, double-blind, placebo-controlled crossover trial to evaluate the efficacy of ipratropium in 20 individuals with CIH between September 2006 and August 2007. This study was 5 to 6 weeks in duration, based on the participants’ clozapine blood-monitoring schedule, and it consisted of two 2-week crossover phases separated by a 1- or 2-week washout period. Primary outcome measures included the reduction in the Toronto Nocturnal Hypersalivation Scale (TNHS) and the Clinical Global Impressions-Severity of Illness (CGI-S) and -Improvement (CGI-I) scales. Secondary outcomes included
visual analog scales assessing hypersalivation
severity (VAS-S) and distress (VAS-D).
Results: No significant reduction in CIH was found on the TNHS (P = .379), CGI-S (P = .266), or CGI-I (P = .599). Moreover, no difference was noted between study groups on the VAS-S (P = .969) and VAS-D (P = .527). There was no difference in the number of CIH responders at the conclusion
of the 2-week placebo (40%, n = 8) and ipratropium (45%, n = 9) study phases (45%, n = 9) according
to the TNHS. Randomization order did not have a significant effect on TNHS, CGI-S, or CGI-I scores. Tolerability was comparable between groups, with dry mouth occurring in 1 placebo group subject and 2 ipratropium group subjects.
Conclusions: Despite the reports of some preliminary studies that ipratropium is an efficacious treatment for CIH, ipratropium failed to demonstrate significant clinical effect in comparison
to placebo. Further research should explore the
efficacy of other locally acting anticholinergic
agents or other classes of medications.
Trial Registration: clinicaltrials.gov Identifier: NCT00381589
Submitted: June 22, 2008; accepted September 10, 2008.
Corresponding author: Sanjeev Sockalingam, MD, University Health Network, Toronto General Hospital 8EN-225, 200 Elizabeth St, Toronto, Ontario M5G 2C4, Canada (email@example.com).