The present invention provides a method for the prevention and treatment of complications after cataract surgery such as secondary cataract and anterior capsule contraction that occur after cataract operation.The present invention relates to a preventive/therapeutic method comprising administering to a subject a medicine containing 4-fluoro-5-{[(2S)-2-methyl-1,4-diazepan-1-yl]sulfonyl}isoquinoline (Ripasudil) or a salt thereof, or a solvate thereof as an active ingredient.
