the phosphodiesterase inhibitors , 3-isobutyl-1-methylxanthine ( ibmx ) and theophylline , inhibited the k ( + ) -evoked release of [ 14c ] gaba , and ibmx reversed the naf facilitation of gaba release in a dose-dependent manner ( pa2 2.57 ) .
C0000096
3-isobutyl-1-methylxanthine
C0039771
theophylline