Provided is a novel compound which has an NK1 receptor antagonistic action and which is useful in the prevention and treatment of nausea and vomiting accompanying the administration of antineoplastic drugs, which have a diminished CYP3A4 inhibitory action compared to aprepitant. That is to say, the present invention pertains to a cyclohexyl-pyridine derivative represented by formula (I), or a pharmacologically acceptable salt thereof. In the formula, ring A is 4-fluoro-2-methyl phenyl or the like, X is a hydrogen atom or the like, R1 is a carboxymethyl or the like, R2 is an alkyl or the like, Y is from 0-2 or the like, U is -N(CH3)COC(CH3)2-3,5-bis(trifl uoromethyl)phenyl or the like.Se proporciona un compuesto novedoso que tiene actividad antagonista del receptor NK1 y es útil para la prevención y tratamiento náuseas y vómitos acompañado por la administración de fármacos neoplásicos, que tienen un acción inhibidora disminuida de CYP34A en comparación con aprepitant. Es decir, la presente invención se refiere derivados de ciclohexilpiridina representados por la siguiente fórmula (I) una sal farmacológicamente aceptable del mismo, en donde el anillo A 4-fluoro-2-metilfenilo o similar; X es un átomo de hidrógeno o similar; R1 es carboximetilo o similar; R2 es alquilo o similar; Y es 0-2 o similar; U es-N(CH3)COC(CH3)2-3,5-bistrifluorometilfeni lo o similares. Fórmula (I): (ver Fórmula).