Converts between opioid medications using equianalgesic ratios. Key conversions (oral morphine equivalents): morphine oral 30 mg = IV 10 mg; oxycodone oral 20 mg; hydromorphone oral 7.5 mg or IV 1.5 mg; fentanyl transdermal patch 25 mcg/h ≈ oral morphine 60 mg/day; methadone conversion is non-linear and requires specialist guidance. Reduce dose 25–50% when switching opioids (incomplete cross-tolerance).
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