Table 1.

Naltrexone and buprenorphine: opioid receptor activity profiles

	Receptor binding Kior IC50
	μ	κ	δ	ORL-1
Naltrexone	0.37	4.8	9.4	3,818a
Buprenorphine	0.77	1.1	2.2	8.4b

Notes: Unless otherwise noted, values are from Schmidt et al.46

^aMcLeod et al;47

^bWnendt et al.48