Olanzapine for Non-Chemotherapy Related Nausea and Emesis in Patients with a Palliative Care Consult.

Current palliative care guidelines lack a specific treatment algorithm for nausea and emesis. Olanzapine is an atypical antipsychotic with antiemetic activity that's recommended in the guidelines for the treatment of chemotherapy induced nausea and vomiting, but outside of oncologic indications there is a lack of research. To describe the safety and efficacy of olanzapine for nausea and emesis in the palliative care domain, excluding patients actively undergoing chemotherapy or radiation. This retrospective chart review encompassed hospitalized adult patients from six hospitals across a large health system admitted from August 2020 through August 2021, with a palliative care consult, and being treated with olanzapine for nausea or emesis. Data was collected on antiemetic therapy affordability, the ability for patients to tolerate medications by mouth, and safety outcomes such as QTc prolongation and increased liver function tests. A total of 78 patients were included in the study. Olanzapine decreased the number of doses required of antiemetic medications, the median doses of antiemetic medications pre-olanzapine was 1.6 (IQR 0.8-2.8) and post-olanzapine was 0.6 (IQR 0-2.4) (P = 0.0006). After olanzapine was initiated, appetite was improved (P < 0.001), cost of antiemetic therapy was reduced by 65 cents per day (P = 0.059) and olanzapine was prescribed at discharge in 69% of patients. QTc prolongation was observed in 19% of patients, and increased ALT and AST were observed in 4.3% and 0%, respectively. This retrospective review demonstrated benefit to utilizing olanzapine for nausea and emesis in palliative care patients and should be considered to aid in symptom management.

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