A clinical decision support alert to promote timely laxative use in in-patients prescribed clozapine.

Background: Clozapine-induced gastrointestinal hypomotility and constipation can result in severe and sometimes fatal gastrointestinal complications. Laxatives should be prophylactically prescribed with clozapine, but this is inconsistently achieved. Digital clinical decision support (CDS) alerts can promote safer prescribing.

Aims: To evaluate whether a CDS alert could promote timely laxative use with clozapine in hospital.

Method: Retrospective in-patient prescribing data was used to compare co-prescribing of laxatives for first clozapine prescriptions pre-alert (January 2017-September 2019) and post-alert (September 2019-December 2023) implementation across 1194 hospital admissions where clozapine was prescribed. Regular non-bulking laxative and any laxative co-prescribing for first clozapine prescriptions within 24 h were assessed. Multivariable logistic regression was performed to determine the impact of alert implementation on laxative co-prescribing.

Results: Of the 1194 admissions included, 449 admissions had clozapine prescribed pre-alert implementation and 745 admissions had post-alert implementation. Regular non-bulking laxative co-prescription occurred for 67.0% of first clozapine prescriptions pre-alert and 76.1% post-alert (P < 0.001). Any laxative co-prescription occurred for 87.3% of first clozapine prescriptions pre-alert and 96.5% post-alert (P < 0.001). Alert implementation was associated with increased likelihoods of regular non-bulking laxative co-prescribing (odds ratio, 1.341; 95% CI, 1.021-1.756; P = 0.035) and any laxative co-prescribing (odds ratio, 3.487; 95% CI, 2.135-5.838; P < 0.001) for first clozapine prescriptions within 24 h.

Conclusions: CDS alert implementation was associated with increased and earlier laxative co-prescribing for clozapine. Our findings suggest that a CDS alert is an effective tool for promoting timely laxative use with clozapine in hospital.