• Leonard Chiu, Nicholas Chiu, Ronald Chow, Liying Zhang, Mark Pasetka, Jordan Stinson, Breanne Lechner, Natalie Pulenzas, Sunil Verma, Edward Chow, and Carlo DeAngelis.
• Sunnybrook Odette Cancer Centre, University of Toronto, Toronto, ON, Canada.
• Ann Palliat Med. 2016 Jul 1; 5 (3): 172-8.

BackgroundWhile the efficacy of olanzapine in the prophylaxis of chemotherapy-induced nausea and vomiting (CINV) has been documented, the literature on the use of olanzapine as a rescue medication for breakthrough CINV has been scarce. The following study retrospectively evaluated the safety and efficacy of olanzapine for the treatment of breakthrough CINV. The efficacy and safety of olanzapine in the prophylactic setting was also examined in a smaller cohort.MethodsElectronic medical records of adult patients aged >17 years receiving a prescription for olanzapine from the Odette Cancer Centre Pharmacy at Sunnybrook Hospital between January 2013 and June 2015 were reviewed retrospectively. Inclusion criteria required receiving one or more doses of olanzapine for the rescue or prophylaxis of CINV and documentation of the outcome.ResultsA total of 154 patients and 193 treatment cycles were included in the breakthrough setting, while a total of 16 patients and 20 treatment cycles were included in the prophylaxis setting. In the breakthrough setting, 88% of cases experienced improved nausea, while 21% of cases reported improved vomiting. In the prophylactic setting, 100% of cases experienced improved nausea, while 65% achieved improved vomiting. A total of 43% of cases in the breakthrough setting and 65% of cases in the prophylactic setting experienced sedation.ConclusionsOlanzapine is effective in improving CINV in both the prophylactic and breakthrough settings. The safety, efficacy, and appropriate dosage of olanzapine for the rescue of breakthrough CINV should be prospectively evaluated in a randomized controlled trial (RCT).

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