Background: One of the FDA-approved treatments for COVID-19 is remdesivir. In this study, we investigated adverse drug events (ADEs) of remdesivir in COVID-19 patients who contacted 13-Aban pharmacy's drug and poison information center (DPIC). Methods: In this study, data of patients receiving remdesivir who contacted the 13-Aban pharmacy's DPIC between April 2021 and May 2022 were extracted. For the evaluation of potential ADEs, we reviewed all contacts related to remdesivir recipients. Results: Out of 223 patients enrolled, 108 (48.40%) developed 120 ADEs. Elevated liver transaminase levels (26.67%) were the most common ADE, followed by weakness (7.5%), nausea, and vomiting (7.5%). The causality assessment of ADE using the Naranjo scale revealed that 41.67% were probable and 58.33% were possible. Conclusion: Based on the results of this study, hepatic dysfunction was the most prevalent ADE among remdesivir recipients; thus, in order to ensure safe use of remdesivir, patients should be closely monitored for this ADE.