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Recently, the role of pharmacists in providing pharmaceutical care has contributed to the successful treatment, reducing drug side effects and resulting in treatment related cost savings. This research aimed to evaluate clinical outcomes and cost-saving from oncology pharmacy interventions by chemotherapy preparation unit pharmacist. Method: A retrospective observational study was conducted on cancer patients receiving chemotherapy at the radiotherapy and chemotherapy center, Khon Kaen Hospital, Khon Kaen, Thailand, from May 1, 2020, to April 30, 2021. Data were retrieved from patient medical records or patients’ electronic databases, including the patient’s demographic information, drug-related problems, and records of pharmacists’ intervention. Descriptive statistics were used to describe clinical outcomes. In addition, the cost-saving were analyzed according to the cost of prevention chemotherapy discrepancies. Results: During the one year period, 56,858 chemotherapy items from 11,129 prescriptions were screened with problems identified in 138 patients, mostly female (63%), with a mean age of 55.8 ± 12.9 years. The most common cancer diagnosed was breast cancer (n=25, 18.1%). Pharmacists intervened in 150 DRPs (1.3 %) of which 126 (84%) DRPs were medication errors (MEs) and 24 DRPs (16%) were adverse drug reactions (ADRs). The most common MEs were unclear written prescriptions (n= 76, 50.7%). The most common adverse reactions were side effects of chemotherapy (n=17, 11.3 %), including nausea and vomiting (n=6, 4%), alopecia (n=4, 2.7%). Pharmacists’ intervention by managing DRPs were mostly (n= 142, 94.7%) accepted by the healthcare team, resulting in problems resolved. Pharmacists' interventions enable patients to receive chemotherapy medications appropriately to prevent and reduce the severity of adverse reactions. In addition, the pharmacist’s interventions led to cost savings of 164,538 THB from preventing inappropriate chemotherapy preparation. Conclusion: Oncology pharmacy interventions by chemotherapy preparation unit pharmacists successfully prevented medication errors and managed adverse drug events. These interventions also resulted in cost savings ensuring positive economic value.
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