Panadanabiona SC. Alterations in aminergic system of rat brain by the opioid analgesic tramadol in the absence of pain-induction. Int J Basic Clin Pharmacol [Internet]. 2017 Nov. 23 [cited 2025 Oct. 23];6(12):2774-82. Available from: https://www.ijbcp.com/index.php/ijbcp/article/view/2124