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[Problem forte--is paracetamol-codeine combination rational?].

Arne Helland1, Olav Spigset, Lars Slørdal

  • 1Institutt for laboratoriemedisin, barne- og kvinnesykdommer, Norges teknisk-naturvitenskapelige universitet, 7489 Trondheim.

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke
|August 31, 2004
PubMed
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Codeine and paracetamol combination drugs offer minimal pain relief, as codeine’s effectiveness depends on the CYP2D6 enzyme, which is absent in 7-10% of people. Potential side effects and abuse risks often outweigh the limited therapeutic benefit.

Area of Science:

  • Pharmacology
  • Pain Management
  • Genetics

Background:

  • Combination analgesics containing codeine and paracetamol are frequently prescribed.
  • The efficacy of codeine is influenced by genetic variations in drug metabolism.

Purpose of the Study:

  • To evaluate the therapeutic benefit and risks of codeine-paracetamol combination analgesics.
  • To assess the impact of CYP2D6 polymorphism on codeine's analgesic efficacy.

Main Methods:

  • Literature review of studies on codeine and paracetamol efficacy.
  • Analysis of meta-analyses examining the addition of codeine to paracetamol.
  • Identification of relevant articles through Medline searches and reference lists.

Main Results:

Related Experiment Videos

  • Codeine's analgesic effect is mediated by its metabolite, morphine, via CYP2D6 enzyme activity.
  • Approximately 7-10% of the population lacks functional CYP2D6, rendering codeine ineffective for them.
  • Meta-analyses indicate minimal therapeutic advantage of adding codeine to paracetamol, with potential for side effects and abuse.

Conclusions:

  • Codeine exhibits unpredictable effects as an opiate.
  • The therapeutic benefit of codeine in combination with paracetamol is limited.
  • In chronic use, side effects, tolerance, and abuse potential likely outweigh any therapeutic gains.