Substituted imidazo[1,5-A]quinoxalin-4-ones are useful for preventing or treating storage dysfunction, voiding dysfunction and bladder/urethral diseases
Substituted imidazo[1,5-a]quinoxalin-4-one compounds of formula (I) described herein exhibit PDE9-inhibitory action and is useful as an active ingredient for an agent for treating and/or preventing storage dysfunction, voiding dysfunction, and bladder/urethral diseases, and the like.