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Related Experiment Videos

Clinically relevant differences among the opioid analgesics.

A G Lipman1

  • 1College of Pharmacy, University Hospital, University of Utah, Salt Lake City 84112.

American Journal of Hospital Pharmacy
|August 1, 1990
PubMed
Summary

Opioid analgesics bind to receptors for pain relief. Strong agonists are preferred for chronic cancer pain due to their broad dosage range and long duration of action.

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Area of Science:

  • Pharmacology
  • Pain Management
  • Neuroscience

Background:

  • Opioids, including endogenous endorphins and exogenous substances, interact with central nervous system opioid receptors.
  • Opioid analgesics exhibit diverse mechanisms of action, including agonism, partial agonism, antagonism, and mixed agonist-antagonist activity.

Purpose of the Study:

  • To describe the mechanism of action of various opioid analgesics.
  • To differentiate clinically relevant properties among opioid drugs.
  • To inform clinical selection of opioids for pain management, particularly in cancer patients.

Main Methods:

  • Review of opioid receptor interactions and drug classifications.
  • Analysis of dose-response curves and ceiling effects.
  • Consideration of pharmacokinetic factors and opioid strength.

Main Results:

  • True agonists (e.g., morphine) display linear dose-response curves, unlike partial agonists and agonist-antagonists which exhibit ceiling effects.
  • Ceiling effects limit the utility of partial agonists and agonist-antagonists for managing progressive chronic pain, such as in cancer.
  • Opioid selection should consider receptor affinity, pharmacokinetics, and drug potency.

Conclusions:

  • Strong opioid agonists with long durations of action are preferable for managing cancer pain.
  • Understanding opioid receptor interactions and drug properties is crucial for effective pain management.
  • Clinical decisions for opioid analgesia should integrate drug characteristics with patient-specific pain profiles.

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