Description_x000D_ Packaging_x000D_ 5, 25 mg in glass bottle_x000D_ Biochem/physiol Actions_x000D_ GS39783 is a positive allosteric modulator (PAM) of GABA-B receptors. GABAB receptor positive allosteric modulators have potential for treatment of many neuro-psychiatric disorders as well as drug dependence and seizures. The receptor is a GPCR expressed throughout the CNS; it acts as both an auto-receptor and heteroreceptor to modulate GABA release and regulate K+ channels and Ca++ channels. GS39783 has been shown to inhibit alcohol self-administration and to have an antipsychotic-like effect in animal models of addiction and schizophrenia, respectively.