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Oral and Transdermal Opioid Analgesic Equivalence

*Duration of analgesia is dose dependent; the higher the dose, usually the longer the duration. These high doses of codeine and meperidine are not recommended clinically. Equianalgesic data not available for hydrocodone. §In opioid-tolerant patients converted to methadone, start with 10-25% of equianalgesic dose. Also, the half-life of methadone can vary widely from 12 to 190 h.

Korean J Pain 2010;23:99~108
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