| abstract |
A pyridazinone or pyridone compound of the following formula (I). n n n wherein n X is n n n Y is N or CH n or a salt thereof. n The pyridazinone or pyridone compound (I) and a salt thereof of the present invention are adenosine antagonists and are useful for the prevention and/or treatment of depression, dementia (e.g. Alzheimer's disease, cerebrovascular dementia, dementia accompanying Parkinson's disease, etc.), Parkinson's disease, anxiety, pain, cerebrovascular disease (e.g. stroke, etc.), heart failure and the like. |