Pharmacology An analgesic ‘X’ acts through opioid as well as additional spinal monoaminergic mechanisms. Which of the following can be ‘X’? A Tramadol B Etioheptazine C Dextropropoxyphene D Alfentanil 💡 Explanation An analgesic 'X' acts through opioid as well as additional spinal monoaminergic mechanisms. Which of the following can be 'X'? ✓ Correct Answer: A. Tramadol