What is the principle guiding opioid rotation in refractory cancer pain?

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Rotating to a different opioid is used because the tolerance that develops to one opioid doesn’t fully apply to another. This incomplete cross-tolerance means a new opioid can restore or improve analgesia and sometimes lessen adverse effects by offering a different pharmacologic profile and duration of action. In practice, you estimate the dose of the new opioid that would provide equivalent analgesia using established equianalgesic tables, then start with a conservative adjustment to account for incomplete cross-tolerance—typically reducing the calculated dose by about a quarter to half—and titrate carefully based on response and side effects. This approach also requires considering differences in routes of administration and pharmacokinetics, and close monitoring to avoid overdose or withdrawal. Other options are less appropriate because rotation is a recognized, useful strategy, it does affect analgesia and side effects, and it is not irreversible.