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Here we demonstrate analgesic synergy between L-methadone and several mu opioid ligands. Of the compounds examined, L-methadone selectively synergizes with morphine, morphine-6beta-glucuronide, codeine, and the active metabolite of heroin, 6-acetylmorphine. Morphine synergizes only with L-methadone. In analgesic assays, D-methadone was inactive alone and did not enhance morphine analgesia when the two were given together, confirming that L-methadone was not acting through N-methyl-D-aspartate mechanisms.