Reference:1. Kumar A, Paul E. Tramadol Induced Vomiting. PTB Report. 2018;4(2):19-20. 2. Smith HS, Smith JM, Seidner P. Opioid-induced nausea and vomiting. 2012;1(2):121-129.
Keywords:tramadol, opioids, morphine, nausea, vomiting