Based on low-quality evidence, methadone is a drug that has similar analgesic benefits to morphine and has a role in the management of cancer pain in adults. Other opioids such as morphine and fentanyl are easier to manage but may be more expensive than methadone in many economies.
The updated review contains new information supporting the previous conclusions that methadone has similar analgesic efficacy to morphine. The additional study examined neuropathic and non-neuropathic pain, finding no superiority for methadone in the former group. The new study also addresses a clinically relevant concern about short term/single dose studies. Use beyond a few days may result in methadone accumulation leading to delayed onset of adverse effects. In an assessment over 28 days there was a higher rate of withdrawal due to side effects in the methadone group. This observation reinforces the advice that experienced clinicians should take responsibility for initiation and careful dose adjustment and monitoring of methadone.
There is evidence to suggest that methadone is an analgesic with similar efficacy to morphine and a comparable side effect profile. However, the majority of studies involved single dose comparisons or short term use. This methodology fails to reproduce clinical practice. Therefore there is a very significant danger that the effects of methadone accumulation leading to delayed onset of adverse effects which occurs with chronic administration has not been represented. Fixed interval dosing schedules conducted over several days are associated with a high risk of serious morbidity and mortality. There is no trial evidence to support the proposal that methadone has a particular role in neuropathic pain of malignant origin. Conclusions have been limited by the variations in trial design, dosing regimens and limited presentation of primary outcome data. The complex and highly individual pharmacokinetics of methadone require that experienced clinicians take responsibility for initiating, titrating and monitoring this drug.
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