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Updated: Feb 4, 2026

Author Spotlight: An Efficient Methodology to Confidently Differentiate and Characterize Fentanyl Analogs
Published on: November 8, 2024
Predosing Chemical Stability of Admixtures of Propofol, Ketamine, Fentanyl, and Remifentanil
Peter Bedocs1,2, David L Evers3, Chester C Buckenmaier1,2
1From the Defense and Veterans Center for Integrative Pain Management, Henry M. Jackson Foundation, Rockville, Maryland.
Abstract:
Admixtures of propofol-ketamine, propofol-ketamine-fentanyl, and propofol-ketamine-remifentanil were subjected to various clinically relevant conditions to study their chemical stability. A novel high-performance liquid chromatography-mass spectrometry method revealed no degradation of any compound by incubation at 37°C, constant mixing, or table-top storage for 6- and 24-hour time periods, except variable recovery of both propofol and fentanyl in the admixtures of propofol-ketamine-fentanyl suggesting possible degradation.
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