Table 2.

Pharmacological enhancers of extinction (systemic)

	Drug	Action	Reference
Preclinical
	DCS	partial NMDAr agonist	Walker et al., 2002
	methylene blue	metabolic enhancer	Gonzalez-Lima and Bruchey, 2004
	yohimbine	noradrenergic α2r antagonist	Cain et al., 2004
	sulpiride	dopamine D2r antagonist	Ponnusamy et al., 2005
	AM-404	cannabinoid reuptake inhibitor	Chhatwal et al., 2005
	WIN 55,212−2	cannabinoid receptor agonist	Pamplona et al., 2006
	dexamethasone	glucocorticoid receptor agonist	Yang et al., 2006
	PEPA	AMPA receptor potentiator	Zushida et al., 2007
Clinical
	DCS	partial NMDAr agonist	Ressler et al., 2004
	cortisol	endogenous glucocorticoid	Soravia et al., 2006