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. Author manuscript; available in PMC: 2007 Dec 1.
Published in final edited form as: Eur J Pharmacol. 2007 Feb 8;563(1-3):92–101. doi: 10.1016/j.ejphar.2007.01.059

Table 2.

Apparent efficacy (τ) estimates for etorphine, oxycodone and morphine

Drug τ (95% C.L.)
Etorphine 52 (48–57)
Oxycodone 20a (19–21)
Morphine 39a (38–41)

The efficacy (τ) for each was determined using the irreversible alkylation method. The values for τ derived by fitting the data from Fig 3 to the operational model of drug agonism (Black and Leff, 1983) as described by Zernig et al. (1996); see methods for complete description of fitting methods.

a

= significantly different from etorphine p<0.05.

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