A Patient With Sepsis-Induced Multiorgan Failure and Increasing Serum Methadone Concentration: A Case Study

Area of Science:

• Pharmacology
• Critical Care Medicine
• Toxicology

Background:

• Substance use disorder presents complex management challenges in critically ill patients.
• Septic shock and multiorgan failure necessitate intensive medical intervention.
• Methadone, a common treatment for opioid use disorder, has a narrow therapeutic index.

Purpose of the Study:

• To report a case of unexplained increasing methadone serum concentration in a patient with septic shock and multiorgan failure.
• To emphasize the importance of therapeutic drug monitoring for methadone in critically ill patients.
• To discuss potential mechanisms for altered methadone pharmacokinetics during critical illness.

Main Methods:

• Case report of a patient with substance use disorder, septic shock, and multiorgan failure.
• Discontinuation of methadone therapy was documented.
• Serial serum methadone concentrations were measured.
• Therapeutic drug monitoring was utilized throughout the patient's hospital stay.

Main Results:

• Serum methadone concentrations continued to rise despite the cessation of methadone administration.
• The patient required intensive care for septic shock and multiorgan failure.
• Therapeutic drug monitoring provided essential data for managing the patient's complex condition.

Conclusions:

• Unexplained increases in methadone serum concentration can occur in critically ill patients, even after drug discontinuation.
• Therapeutic drug monitoring is vital for optimizing methadone therapy and ensuring patient safety in critical care settings.
• Further research is needed to elucidate the pharmacokinetic changes affecting methadone levels during severe illness.