Maribavir antagonizes the antiviral action of ganciclovir on human cytomegalovirus.

@article{Chou2006MaribavirAT,
  title={Maribavir antagonizes the antiviral action of ganciclovir on human cytomegalovirus.},
  author={Sunwen Chou and Gail I. Marousek},
  journal={Antimicrobial agents and chemotherapy},
  year={2006},
  volume={50 10},
  pages={3470-2}
}
The cytomegalovirus (CMV) UL97 kinase inhibitor maribavir antagonized the anti-CMV effect of ganciclovir, increasing the ganciclovir 50% inhibitory concentration against a sensitive strain by up to 13-fold. Antiviral activities of foscarnet and cidofovir were unaffected by maribavir.