Panadanabiona, Sahitya C. 2017. “Alterations in Aminergic System of Rat Brain by the Opioid Analgesic Tramadol in the Absence of Pain-Induction”. International Journal of Basic & Clinical Pharmacology 6 (12):2774-82. https://doi.org/10.18203/2319-2003.ijbcp20175161.