| abstract |
A polycyclic xanthine PDE V inhibitor having advantageous therapeutic properties. A xanthine phosphodiesterase V inhibitor has the formula (I), wherein R 4 is a C 3-15 cycloalkyl group with or without one or more substituents, one or more A xanthine phosphodiesterase V inhibitor which is a C 3-15 cycloalkenyl group with or without substituents, or a 3- to 15-membered heterocycloalkyl group with or without one or more substituents Is useful for treating male (erectogenic) and female sexual dysfunction and other physiological disorders. For example, an exemplary compound of the invention is formula (II). [Selection figure] None |