PROBLEM TO BE SOLVED: To provide a drug to be used for prevention or therapy of diseases, such as dementia, alzheimer disease, attention deficit/hyperactivity, schizophrenia, epilepsy, central convulsion, obesity, diabetes, hyperlipidemia, narcolepsy, idiopathic hypersomnia, behavior-induced insufficient sleep syndrome, sleep apnea syndrome, circadian rhythm disorders, parasomnia, sleep-related movement disorders, insomnia, depression or allergic rhinitis, by inhibition of bonding of histamine to histamine H3 receptor.SOLUTION: A preventive or therapeutic agent contains a phenyl triazole derivative compound represented by the formula (I) or a pharmaceutically acceptable salt thereof. [In the formula, the ring P is a specific triazole group Q is a specific piperidyl oxy group or a specific aminopropyl oxy group and R1 is H, a halogen atom or a C1 to 6 alkyl.]COPYRIGHT: (C)2015,JPO&INPIT【課題】ヒスタミンH3受容体へのヒスタミンの結合に対する阻害により認知症、アルツハイマー病、注意欠陥・多動性症、統合失調症、てんかん、中枢性痙攣、肥満、糖尿病、高脂血症、ナルコレプシー、特発性過眠症、行動誘発性睡眠不足症候群、睡眠時無呼吸症候群、概日リズム障害、睡眠時随伴症、睡眠関連運動障害、不眠症、うつ病、又はアレルギー性鼻炎等の疾患の予防又は治療に使用する薬の提供。【解決手段】式(I)で表されるフェニルトリアゾール誘導体化合物、又はその医薬上許容される塩を含有する予防剤又は治療剤。[環Pは特定のトリアゾール基;Qは特定のピペリジルオキシ基又は特定のアミノプロピルオキシ基;R1はH、ハロゲン原子又はC1~6のアルキル]【選択図】なし