Related Experiment Video
Updated: Feb 22, 2026

Development of Recombinant Proteins to Treat Chronic Pain
Published on: April 11, 2018
Discovery and development of tramadol for the treatment of pain
Lidia Bravo1,2,3, Juan Antonio Mico2,4,3, Esther Berrocoso1,2,3
1a Neuropsychopharmacology and Psychobiology Research Group, Psychobiology Area, Department of Psychology , University of Cadiz , Puerto Real (Cadiz) , Spain.
Introduction:
Tramadol is an opioid drug that, unlike classic opioids, also modulates the monoaminergic system by inhibiting noradrenergic and serotoninergic reuptake. For this reason, tramadol is considered an atypical opioid. These special pharmacological characteristics have made tramadol one of the most commonly prescribed analgesic drugs to treat moderate to severe pain. Areas covered: The aim of this review is to provide a historical description of the biochemistry, pharmacokinetics and particularly, the mechanisms of action of tramadol. In addition, a summary is offered of the analgesic effects of tramadol in a variety of animal models of acute and chronic pain. Finally, clinical studies that demonstrate the efficacy and safety of tramadol in the treatment of pain are also assessed. Expert opinion: The discovery that tramadol combines opioid and monoaminergic effects represented a milestone in the evolution of pain treatment. Given its 'mild effect' on opioid receptors, tramadol induces fewer side effects than classic opioids. Tramadol produces satisfactory analgesia against various types of pain and it is currently approved for the treatment of moderate to severe pain. Thus, the combination of monoamine and opioid mechanisms opens new avenues for the design of innovative analgesics.
Related Concept Videos
Analgesia and Pain Management
Opioid Analgesics: Synthetic and Semisynthetic Opioids
Opioid Analgesics: Morphine and Other Natural Cogeners
Prescription, Nonprescription and Orphan Drugs
The misuse and addiction to prescription drugs is a growing problem that can affect people of all age groups, specifically teenagers. This can happen when prescription medications are used in ways not intended by the prescriber, such as taking someone else's prescription or using medication for...
Pain
Drug Discovery: Overview

