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Conversion from parenteral to oral methadone.

Jesús González-Barboteo1, Josep Porta-Sales, Daniel Sánchez

  • 1Palliative Care Service, Institut Català d'Oncologia, L'Hospitalet de Llobregat, Barcelona, Spain. jgonzalez@ico.scs.es

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The standard methadone conversion ratio from parenteral to oral routes may cause toxicity. A revised 1:0.7 ratio (oral:parenteral) is recommended for safer methadone conversion, improving pain management.

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Area of Science:

  • Pharmacology
  • Pain Management
  • Clinical Pharmacy

Background:

  • Methadone is a complex opioid analgesic used for chronic pain management.
  • Traditional conversion ratios between oral (PO) and parenteral (PAR) methadone routes (2:1 PO:PAR, 1:2 PAR:PO) are frequently employed.
  • These standard ratios have been associated with toxicity issues during opioid rotation.

Purpose of the Study:

  • To evaluate the efficacy and safety of a revised methadone conversion ratio.
  • To address toxicity problems observed with traditional methadone conversion ratios.
  • To recommend an optimized conversion ratio for parenteral to oral methadone administration.

Main Methods:

  • Retrospective review of patient cases undergoing methadone conversion from parenteral to oral routes.
  • Analysis of clinical outcomes and adverse events associated with methadone conversion.
  • Comparison of traditional and proposed methadone conversion ratios.

Main Results:

  • The traditional 1:2 (PAR:PO) conversion ratio resulted in toxicity.
  • A revised conversion ratio of 1:0.7 (PAR:PO) was investigated.
  • This new ratio approximates oral methadone bioavailability, potentially reducing toxicity.

Conclusions:

  • The traditional parenteral to oral methadone conversion ratio may lead to adverse events.
  • A revised conversion ratio of 1:0.7 (PAR:PO) is proposed for safer methadone therapy.
  • This adjusted ratio may improve patient outcomes during opioid rotation and pain management.