Disclosed are a compound represented by formula (1) and a non-toxic salt thereof, a production method thereof, and a pharmaceutical composition for treating a serotonergic neuron-related disease comprising the same as an active ingredient: ##STR1## wherein R.sup.1 represents a hydrogen atom or a lower alkyl group; R.sup.2 represents a pyridyl group which is unsubstituted or substituted with 1 to 3 substituents each independently selected from the group consisting of a halogen atom, a lower alkyl group, a trifluoromethyl group, a lower alkoxy group, a carbamoyl group and a cyano group, or a pyrimidinyl group which is unsubstituted or substituted with 1 to 2 substituents each independently selected from the group consisting of a lower alkyl group and a lower alkoxy group; and n is an integer of from 2 to 5. Compound (1) of the present invention and a non-toxic salt thereof have a strong affinity for serotonin 1A receptor and, therefore, they are useful for preventing and treating serotonergic neuron-related diseases, such as motion sickness, space sickness, emesis, dizziness, depression, anxiety, eating disorder, and the like.

space motion sickness/dizziness

2-alkoxy-5,6,7,8-tetrahydroquinoxaline derivatives, and production method and use thereof

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