The purpose of the present invention is to provide a pharmaceutical composition that comprises (6{[4-(pyrazol-1-yl)benzyl](pyridine-3-ylsulfonyl)aminomethyl}pyridine-2-ylamino)isopropyl acetate or a salt thereof and polyoxyethylene castor oil, wherein the polyoxyethylene castor oil exhibits the number of polymerization of ethylene oxide in a range of 5 to 100, and wherein the content of the polyoxyethylene castor oil relative to (6{[4-(pyrazol-1-yl)benzyl](pyridine-3-ylsulfonyl)aminomethyl}pyridine-2-ylamino)isopropyl acetate or a salt thereof is in a range of 2/0.03 to 5,000 parts by mass relative to 1 part by mass of 6-{[4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl}pyridin-2-ylamino)isopropyl acetate or a salt thereof； and to provide a method for stabilizing (6-{[4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl}pyridin-2-ylamino)isopropyl acetate or a salt thereof by allowing a pharmaceutical composition comprising (6-{[4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl}pyridin-2-ylamino)isopropyl acetate or a salt thereof to comprise polyoxyethylene castor oil, wherein the polyoxyethylene castor oil exhibits the number of polymerization of ethylene oxide in a range of 5 to 100, and wherein the content of the polyoxyethylene castor oil relative to (6{[4-(pyrazol-1-yl)benzyl](pyridine-3-ylsulfonyl)aminomethyl}pyridine-2-ylamino)isopropyl acetate or a salt thereof is in a range of 2/0.03 to 5,000 parts by mass relative to 1 part by mass of 6-{[4-(pyrazol-1-yl)benzyl](pyridin-3-ylsulfonyl)aminomethyl}pyridin-2-ylamino)isopropyl acetate or a salt thereof.Цель настоящего изобретения заключается в обеспечении фармацевтической композиции, которая содержит (6-{[4-(пиразол-1-ил)бензил](пиридин-3-илсульфонил)аминометил}пиридин-2-иламино)изопропилацетат или его соль и полиоксиэтиленовое касторовое масло, где полиоксиэтиленовое касторовое масло имеет показатель полимеризации окиси этилена в диапазоне от 5 до 100 и где содержание полиоксиэтиленового к
