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Related Concept Videos

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...
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...
Opioid Analgesics: Synthetic and Semisynthetic Opioids01:15

Opioid Analgesics: Synthetic and Semisynthetic Opioids

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...
Opioid Analgesics: Morphine and Other Natural Cogeners01:20

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...
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...
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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Related Experiment Video

Updated: Jul 5, 2026

Tracking Drug-induced Changes in Receptor Post-internalization Trafficking by Colocalizational Analysis
07:48

Tracking Drug-induced Changes in Receptor Post-internalization Trafficking by Colocalizational Analysis

Published on: July 3, 2015

Opioid pharmacology.

Andrea M Trescot1, Sukdeb Datta, Marion Lee

  • 1University of Florida, Gainesville, FL 32606, USA. amt57@aol.com

Pain Physician
|June 17, 2008
PubMed
Summary

Mu receptor agonists, used for pain relief, have well-known pharmacokinetics but poorly understood metabolism. Understanding opioid metabolites is key to managing analgesia and adverse effects in patients.

Area of Science:

  • Pharmacology
  • Medicinal Chemistry

Background:

  • Mu agonists have a long history in pain management.
  • Opioid pharmacokinetics are established, but metabolism and metabolite roles are emerging areas of interest.
  • Commonly used opioids include morphine, hydromorphone, oxycodone, and fentanyl.

Purpose of the Study:

  • To review opioid structure, chemistry, and metabolism.
  • To elucidate the role of opioid metabolites in patient response.
  • To better understand side effects, drug interactions, and individual variability in pain management.

Main Methods:

  • Literature review of opioid pharmacology and metabolism.
  • Analysis of existing pharmacokinetic and pharmacodynamic data.
  • Discussion of clinical implications for chronic pain treatment.

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Intracranial Pharmacotherapy and Pain Assays in Rodents
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Intracranial Pharmacotherapy and Pain Assays in Rodents

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Tracking Drug-induced Changes in Receptor Post-internalization Trafficking by Colocalizational Analysis
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Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
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Main Results:

  • Opioid metabolism pathways are complex and influence therapeutic outcomes.
  • Metabolites can contribute to both analgesia and adverse effects.
  • Individual patient responses to opioids are modulated by metabolic profiles.

Conclusions:

  • Mu receptor agonists and agonist-antagonists are crucial for pain control.
  • These agents are also used to manage opioid-induced side effects and withdrawal.
  • Further research into opioid metabolism is vital for optimizing pain therapy.