Disclosed are compositions comprising an antisense oligonucleotide and a non-ionic, low-osmolar contrast agent. Also disclosed are methods of delivering an antisense oligonucleotide to a target sire comprising incorporating the antisense oligonucleotide into a composition comprising a non-ionic, low-osmolar contrast agent. Also disclosed are methods of treating a neurodegenerative disease comprising administering one or more of the compositions disclosed herein.