Ogundipe, Olayinka A. “Serotonin Syndrome Due to Duloxetine and Tramadol Use in an Older Patient”. International Journal of Basic & Clinical Pharmacology 9, no. 7 (June 26, 2020): 1124–1129. Accessed November 13, 2025. https://www.ijbcp.com/index.php/ijbcp/article/view/4153.