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. 2018 Apr;365(1):37–47. doi: 10.1124/jpet.117.246439

TABLE 2.

Individual %MPEmax values for each fentanyl/naltrexone combination or test drug administered in an assay of thermal nociception at 50 and 54°C in rhesus monkeys

Drug or Drug Mixture %MPEmax
50°C
54°C
M1414 M1473 M1478 M1503 M1414 M1473 M1478 M1503
Fentanyl 100 100 100 100 87 100 100 100
1:0.025 Fentanyl/naltrexone 100 100 100 100 81.1 100 100 100
1:0.074 Fentanyl/naltrexone 84.2 100 100 3.3 37.6 62.7 62.2 4.7
1:0.22 Fentanyl/naltrexone 9 6.6 42.2 10.4 18.1 10 44.2 1.1
(−)-Naltrexone 9.5 2.1 −12.6 −1.6 3.2 1.8 −0.3 0.6
(±)-Methadone 100 100 100 100 100 100 100 100
(−)-Oxycodone 100 100 100 100 71.4 100 86.1 100
(−)-Morphine 100 100 100 100 74.9 52.8 84.7 100
(−)-Nalbuphine 100 100 100 100 52.8 100 71.9 31.7
(±)-Buprenorphine 73.2 100 100 100 32.1 18.7 29.3 16.5
NAQ 4.6 5.9 28.8 8 6.4 1.1 16.1 2.8