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Related Concept Videos

Analgesia and Pain Management01:25

Analgesia and Pain Management

Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
Drug Abuse and Addiction: Pharmacological Phenomena01:15

Drug Abuse and Addiction: Pharmacological Phenomena

Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not necessarily...
Opioid Receptors: Overview01:22

Opioid Receptors: Overview

Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2, D-Pen5]-enkephalin or DPDPE for...
Pharmacodynamics: Overview and Principles01:21

Pharmacodynamics: Overview and Principles

Pharmacodynamics is a scientific field that delves into drugs' intricate biochemical, cellular, and physiological effects on the human body. The study of pharmacodynamics helps us understand how drugs interact with the body and elicit various responses.
Most drugs' effects result from their interactions with drug receptors or targets within the body. These interactions trigger specific responses at the cellular or systemic level. Drug receptors can be found on the surfaces of cells or within...
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Opioid Analgesics: Morphine and Other Natural Cogeners

Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...

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Updated: Jun 26, 2026

Determining Pain Detection and Tolerance Thresholds Using an Integrated, Multi-Modal Pain Task Battery
09:38

Determining Pain Detection and Tolerance Thresholds Using an Integrated, Multi-Modal Pain Task Battery

Published on: April 14, 2016

Tramadol: basic pharmacology and emerging concepts.

Roy R Reeves1, Randy S Burke

  • 1Mental Health Service, G.V. (Sonny) Montgomery VA Medical Center, Jackson, Mississippi, USA. roy.reeves@med.va.gov

Drugs of Today (Barcelona, Spain : 1998)
|January 31, 2009
PubMed
Summary
This summary is machine-generated.

Tramadol hydrochloride, a dual-action analgesic, offers pain relief through micro-opioid receptor activation and enhanced serotonin/norepinephrine transmission. Its potential antidepressant effects may benefit patients with chronic pain and depression, with a low reported incidence of abuse.

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Area of Science:

  • Pharmacology
  • Pain Management
  • Neuroscience

Background:

  • Tramadol hydrochloride is a globally prescribed analgesic with extensive research into its properties.
  • It is a racemic mixture with enantiomers and metabolites exhibiting distinct effects.
  • Ongoing research continues to uncover new information about tramadol.

Purpose of the Study:

  • To review the pharmacokinetic and pharmacodynamic properties of tramadol.
  • To explore the dual mechanisms of action of tramadol in pain management.
  • To discuss the potential antidepressant effects and clinical utility in specific patient populations.

Main Methods:

  • Literature review of pharmacokinetic and pharmacodynamic studies.
  • Analysis of tramadol's mechanisms of action, including receptor interactions.
  • Examination of clinical data regarding efficacy, side effects, and abuse potential.

Main Results:

  • Tramadol exhibits dual mechanisms: micro-opioid receptor activation and enhanced serotonin/norepinephrine transmission.
  • Potential for antidepressant effects due to increased neurotransmission.
  • Beneficial in various acute and chronic pain syndromes, including neuropathic pain.
  • Low incidence of abuse reported (approx. 1 in 100,000 patients).

Conclusions:

  • Tramadol's dual action and potential antidepressant properties make it valuable for chronic pain, especially with comorbid depression.
  • Further research is needed to fully elucidate the contribution of each mechanism to analgesia.
  • Despite potential for abuse, studies indicate a low incidence.