Methadone is an effective analgesic with unique pharmacokinetic and pharmacodynamic variables. There is no national consensus on methadone equianalgesia tools. Our study aimed to compare methadone equianalgesic tools from various national institutions with the primary objective to summarize current practice and secondary objective to determine if a national consensus can be established. Out of 25 institutional methadone equianalgesic tools reviewed, 18 contained sufficient data and were included in this study. Fifteen (15) of the institution evaluated tools utilized a wide variety of dose-dependent modalities for methadone conversion with the hospice and palliative care (HAPC) Consensus method being the most common. Based on the variability of the equianalgesia tools evaluated in this study, we were unable to recommend a consensus methadone conversion method. Further trials exploring methadone equianalgesia beyond our study are needed.
Keywords: Methadone; equianalgesic; methadone equianalgesia; opioid conversion.