Mizukami, N., Yamauchi, M., Koike, K., Watanabe, A., Ichihara, K., Masumori, N., & Yamakage, M. (2014). Olanzapine for the prevention of chemotherapy-induced nausea and vomiting in patients receiving highly or moderately emetogenic chemotherapy: A randomized, double-blind, placebo-controlled study. Journal of Pain and Symptom Management, 47(3), 542–550.
To determine whether adding olanzapine to current standard antiemetic therapy could reduce the frequency of chemotherapy-induced nausea and vomiting (CINV) and improve patients’ quality of life (QOL) during chemotherapy
Randomized, double-blind, placebo-controlled trial
The olanzapine group achieved better total control (59% overall, 86% in the acute phase, and 64% in the delayed phase) than the control group (23% overall, 55% in the acute phase, and 23% in the delayed phase). The olanzapine group also achieved better complete protection and complete response except for acute phase complete response (p < .05). Furthermore, the olanzapine group experienced better QOL (p < .01), and the olanzapine group indicated that CINV did not affect their daily activities whereas 36% of the control group reported influence of CINV on daily life activities. There were significant differences between the VAS for nausea and satisfaction scores for additional medication. Most of the olanzapine group patients (91%) wished to receive same protocol for future chemotherapy. Dietary intake was better maintained by the olanzapine group with a significant difference on day 2 and days 4–6.
The addition of 5 mg/day of oral olanzapine to standard therapy can reduce the frequency of CINV and improve QOL for patients receiving highly or moderately emetogenic chemotherapy.
The addition of olanzapine to standard antiemetics, such as 5-HT3RA, steroids, and NK1RA, could achieve better control of CINV, especially for the delayed phase, with additional benefit in terms of QOL and less change in dietary intake. However, caution needs to be exercised in interpreting the result as the study allowed NK1 for the MEC, had age difference between the olanzapine and control group, and did not take risk factors of CINV into consideration, and the palonosetron dose of 0.75mg was higher than antiemetic recommendations.