摘要 |
A phosphodiesterase 10A inhibitor serving as an effective prophylactic or therapeutic agent for Parkinson's disease, Huntington's disease, Alzheimer's disease, and schizophrenia. The PDE10A inhibitor contains as an active ingredient a pyrazolo[1,5-a]pyridine derivative represented by the following general formula: wherein R<SUP>1 </SUP>and R<SUP>2 </SUP>are each independently a hydrogen atom or a lower alkyl group having 1 to 4 carbons; and R<SUP>3 </SUP>is a hydrogen atom, a lower alkyl group having 1 to 4 carbons, or a lower alkoxyl group having 1 to 3 carbons.
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