the unselective pde inhibitors theophylline ( 2.5 mm ) and ibmx ( 0.2 mm ) and the selective cyclic gmp pde inhibitor m & b 22948 ( 0.1 mm ) inhibited the antigen induced histamine release by 50 % while 48/80 induced release was inhibited by about 25 % .
C0039771
theophylline
C0000096
ibmx