Table 1.

ED₅₀ values (in milligrams per kilogram with 95% confidence limits) for σR antagonists and agonists in decreasing rates of responding maintained by DTG, PRE-084, cocaine, or food presentation

Treatment	DTG	PRE-084	Cocaine	Food Presentation
BD 1008	2.88 (2.46–3.36)	2.19 (1.35–3.13)	NS	13.2 (7.02–35.6)
BD 1047	9.47 (5.96–14.6)	NT	ND	14.3 (7.46–46.2)
BD 1063	2.95 (2.46–3.52)	NT	NS	15.0 (5.23–3590)

NS, nonsignificant linear regression; ND, not determined; NT, not tested.