Tablet comprising the following components (1) to (4): (1) as an effective ingredient, a 4,5-epoxymorphinan derivative represented by the formula (I): ** (See formula) ** [in which, the double line composed of a dotted line and a solid line represents a double bond or a single link； R1 represents C1-C5 alkyl, C4-C7 cycloalkylalkyl, C5-C7 cycloalkenyl alkyl, C6-C12 aryl, C7-C13 aralkyl, C4-C7 alkenyl, allyl, furan-2-C1-C5 alkyl or thiophene-2-C1-alkyl C5； R2 represents hydrogen, hydroxy, nitro, C1-C5 alkanoyloxy, C1-C5 alkoxy, C1-C5 alkyl or -NR7R8； R7 represents hydrogen or C1-C5 alkyl； R8 represents hydrogen, C1-C5 alkyl or -C (>； = O) R9； R9 represents hydrogen, phenyl or C1-C5 alkyl； R3 represents hydrogen, hydroxy, C1-C5 alkanoyloxy or C1-C5 alkoxy； A represents -N (R4) C (>； = X) -, -N (R4) C (>； = X) Y-, -N (R4) - or -N (R4) SO2- (where X and Y independently represent NR4, S or O； R4 represents hydrogen, C1-C5 linear or branched alkyl or C6-C12 aryl； and R4 in the formula may be the same or different)； B represents a linear or branched C1-C14 alkylene or valence bond (provided that the alkylene is optionally substituted with at least one substituent selected from the group comprising C1-C5 alkoxy, C1-C5 alkanoyloxy, hydroxy, fluorine , chlorine, bromine, iodine, amino, nitro, cyano, trifluoromethyl, trifluoromethoxy and phenoxy, and that 1 to 3 methylene groups may be substituted by one or more carbonyl groups), C2-C14 linear or branched acyclic unsaturated hydrocarbon containing 1 to 3 double bonds and / or triple bonds (with the proviso that said acyclic unsaturated hydrocarbon is optionally substituted with at least one substituent selected from the group comprising C1-C5 alkoxy, C1-C5 alkanoyloxy, hydroxy, fluorine, chlorine, bromine, iodine, amino, nitro, cyano, trifluoromethyl, trifluoromethoxy and phenoxy, and that 1 to 3 methylene groups may be substituted by one or more carbonyl groups) or linear or branched saturated or unsaturated hydrocarbon
