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. 2007 Oct 4;25(1):183–193. doi: 10.1007/s11095-007-9440-z

Fig. 5.

Fig. 5

Estimated therapeutic utility function of buprenorphine (dashed line) or fentanyl (solid line) treatment as a function of its respective biophase exposure. The therapeutic utility function is defined as probability of antinociception—probability of respiratory depression.