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Should Codeine Still be Considered a WHO Essential Medicine?
Boni Singu1, Roger K Verbeeck2
1School of Pharmacy, University of Namibia.
Summary
Codeine
Area of Science:
- Pharmacology
- Pain Management
- Drug Metabolism
Background:
- Codeine is frequently prescribed for pain relief, diarrhea, and cough suppression.
- Its efficacy as an analgesic relies on conversion to morphine, a process influenced by the CYP2D6 enzyme.
- Significant inter-individual variability exists in codeine's metabolic pathway, leading to inconsistent pain relief.
Purpose of the Study:
- To evaluate the clinical efficacy and safety of codeine for analgesic, antidiarrhoeal, and antitussive purposes.
- To review the scientific literature regarding codeine's effectiveness and potential for abuse.
- To assess the appropriateness of codeine's inclusion on essential medicines lists.
Main Methods:
- Systematic review of randomized controlled trials and scientific literature.
- Analysis of codeine's biotransformation pathway and its impact on therapeutic response.
- Evaluation of clinical evidence supporting codeine's use in various medical conditions.
Main Results:
- Codeine demonstrates the weakest analgesic effect among common analgesics for postoperative pain.
- Limited evidence supports codeine's effectiveness as an antitussive for acute or chronic cough.
- Codeine carries a risk of abuse and dependence due to its metabolism into morphine.
Conclusions:
- The World Health Organization (WHO) removed codeine for pediatric use in 2011.
- Strong consideration should be given to removing codeine from the adult essential medicines list.
- Healthcare professionals should exercise extreme caution when prescribing or dispensing codeine.
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