3,5,7-Trisubstituted pyrazolo[1,5-a]pyrimidines are disclosed of the general formula ##STR1## wherein R.sub.1 is CF.sub.3 or C.sub.1 -C.sub.9 alkyl; R.sub.2 is CF.sub.3 or C.sub.1 -C.sub.9 alkyl; and R.sub.3 is halogen. Such compounds are useful as inhibitors of 3',5'-cyclic AMP phosphodiesterase enzyme.