Task The present invention provides a novel medicine for the prevention and treatment of cataract surgical complications such as late cataract, posterior capsule contraction and the like that develops after cataract surgery.SOLUTION: The present invention relates to a pharmaceutical composition comprising 4-fluoro-5-{[(2S)-2-methyl-1,4-diazepan-1-yl] sulfonyl} isoquinoline (lipazil) or a salt thereof or a solvate thereof as an active ingredient Such as posterior cataract, posterior capsule contraction and the like.Selection drawing None