Drug-related problems and its associated factors among breast cancer patients at the University of Gondar Comprehensive Specialized Hospital, Ethiopia: A hospital-based retrospective cross-sectional study

Background Breast cancer is the most frequently diagnosed cancer and the leading cause of cancer deaths among women worldwide. If untreated and undetected at the early stage, it causes death by spreading to distant organs. Despite various studies suggesting the high prevalence of drug-related problems among cancer patients, there was a paucity of data regarding the problems among breast cancer patients in our setting. Hence, this study was aimed to assess the drug-related problems among patients with breast cancer at the Oncology Unit of the University of Gondar Comprehensive Specialized Hospital. Methods A retrospective cross-sectional study was conducted at the Oncology Unit of the University of Gondar Comprehensive Specialized Hospital. The data were collected by retrospective reviewing medical records of 107 breast cancer patients. The data entry and analysis were done using SPSS version 20.0 statistical software. Descriptive statistics such as percent and frequency were used to summarize categorical variables of patients' characteristics. Univariable and multivariable binary logistic regression analyses were used to investigate the potential predictors of drug-related problems. A p-value of < 0.05 was considered statistically significant. Results A total of 203 drug-related problems were identified from 76 breast cancer patients, translating to a prevalence of 71.03%. Among the drug-related problems identified, adverse drug reaction (48.6%), need for additional drug therapy (45.8%), and non-adherence (32.7%) were the most prevalent. In the multivariable analysis, breast cancer patients who had concurrent co-morbidities were almost three times (AOR = 2.97, p = 0.035) more likely to experience drug-related problems as compared to those patients without co-morbidity. Moreover, those patients who had been treated with neoadjuvant chemotherapeutic regimens were 0.34 times less likely (crude odd ratio = 0.34, p = 0.023) to have drug-related problems as compared to patients treated with adjuvant chemotherapy regimens. Conclusion The prevalence of drug-related problems was high in our setting. Adverse drug reactions, the need for additional drug therapy, and non-adherence were the most frequently occurring drug-related problems in the study setting. Neoadjuvant chemotherapy and the presence of co-morbidities were significant predictors of drug-related problems among breast cancer patients.