the following agents were essentially without effect at the highest doses examined : 3,6-diacetylmorphine , n-normeperidine-hcl , nalorphine-hcl , alfentanil , sufentanil , naloxone , naltrexone , methadone , dextrorphan tartrate , meperidine-hcl , oxycodone , levorphanol , oxymorphone , codeine phosphate , thebaine , nalbuphine and naltrexone-3-glucuronide .
C0027358
naloxone
C0027360
naltrexone