A suspension preparation for instillation into eyes that contains (R)-(-)-2-(4-bromo-2-fluorobenzyl)-1,2,3,4-tetrahydropyrrolo[1,2-a]pyrazine-4-spiro-3'-pyrrolidine-1,2',3,5'-tetraone, said suspension preparation being capable of avoiding side effects caused by systemic exposure, being efficacious against posterior eye diseases, etc. and having excellent stability.