The prevalence of constipation in adult psychiatric out-patients on clozapine treatment at a regional public hospital in Hong Kong.

Objective: To determine the occurrence of constipation in local patients on clozapine treatment, and to compare the demographical and clinical characteristics of patients on clozapine treatment with or without constipation.

Methods: This is a cross-sectional, observational study. All adult psychiatric out-patients on clozapine treatment attending follow-up at a regional hospital were recruited for clinical interview and medical record review.