Cytovene is used for treating the CMV eye infection also for treating CMV infection in certain organ transplant patients. There can be various other conditions as well, and you can consult your doctor for that. It works by blocking CMV virus infections. If you are allergic to any ingredient that is a part of the Cytovene, consult your doctor immediately. Even if you have very low white blood cells and platelet levels then as well Cytovene is not prescribed. This is because Cytovene can lower white blood cells and platelet levels.