Cancers are important non-communicable diseases with great morbidity and mortality worldwide. The clinical pharmacist makes sure the patient is receiving an optimized medication treatment. The primary objective of the study was to perform comprehensive medication chart review on hospitalized oncology patients and to report and document potential side effects and drug-drug interactions prescribed for oncology patients. A prospective interventional study was conducted for 6 months from Jan 2022 to July 2022 in the Department of Medical Oncology of KIMSH & RC