Table 1.

Noradrenergic (α, β), imidazoline (I₁) and corticotropin-releasing factor (CRF R1) receptor ligands used in the current studies.

Drug	Receptor action	Doses (mg/kg)	Vehicle
Clonidine	I1> α2 agonist (4-fold)	0.005, 0.01, 0.02	Saline
RS-79948	α2 antagonist (selective)	1.0	Saline
UK-14,304	α2> I1 agonist (100-fold)	0.05, 0.1, 0.2	Water
Guanfacine	α2A agonist (selective)	0.2, 1.0	Saline
Moxonidine	I1> α2 agonist (40-fold)	0.2, 1.0	Saline
Prazosin	α1 (and α2B) antagonist	1.0, 3.0	10% DMSO in water
(S)-(-)-Propranolol	β antagonist	5, 10	Saline; (R)-(-)-Prop control
CP-154,526	CRF R1 antagonist	20	5% cremophor in saline
Antalarmin	CRF R1 antagonist	10, 20	10% cremophor in water