This invention relates to new therapeutically useful
8-(disubstituted)phenyl-6,9-dihydro-5H-pyrrolo[2,3-e][1,2,4]triazolo[4,3--
c]pyrimidine-5-one and
8-phenyl-6,9-dihydro-5H-pyrrolo[3,2-e][1,2,4]triazolo[4,3-c]pyrimidine-5--
one derivatives of formula (I): wherein: --X--C--Y-- represents (a) or (b)
to processes and intermediates for their preparation, to pharmaceutical
compositions containing them and to their medical uses as potent and
selective inhibitors of phosphodiesterase 5 (PDE 5).