Provided is a drug for treating cocaine addiction or preventing the recurrence of the same. More specifically, provided is a drug for treating cocaine addiction or preventing the recurrence of the same, said drug comprising (R)-2-{3-[1-(5-methyl-1,2,3,4-tetrahydronaphthalen-1-yl)piperid in-4-yl]-2,3-dihydro-2-oxo-benzimidazol-1-yl}-N-methylacetamide or a pharmaceutically acceptable salt thereof.La presente invencion proporciona un farmaco para tratar la adiccion a la cocaina o prevenir la recaida de la misma； especificamente, la presente invencion proporciona un farmaco para tratar la adiccion a la cocaina o prevenir la recaida de la misma que contiene (R)-2-{3-[1-(5-metil- 1,2,3,4-tetrahidronaftale n-1-il)piperidin-4-il]-2,3-dihidro-2-oxo-bencimidazol-1-il}-N-met ilacetamida o una sal farmaceuticamente aceptable de la misma.
