abstract |
It is intended to provide PDE10A inhibitors which are useful in preventing or treating Parkinson’s disease, Huntington’s disease, Alzheimer’s disease or integration dysfunction syndrome. A phosphodiesterase 10A inhibitor characterized by containing, as the active ingredient, a pyrazolo[1,5-a]pyridine derivative represented by the following general formula (1) is useful in preventing or treating Parkinson’s disease, Huntington’s disease, Alzheimer’s disease or integration dysfunction syndrome: (1) wherein R1 and R2 independently represent each hydrogen or C1-4 lower alkyl; and R3 represents hydrogen, C1-4 lower alkyl or C1-3 lower alkoxy. |