Valganciclovir is an antiviral medication used to treat herpes simplex virus (HSV) infections. It is also used to prevent HSV infections in people who are at high risk for them, such as those with HIV/AIDS or cancer. Valganciclovir can be taken by mouth or injected into a vein.
Valganciclovir works by stopping the spread of the virus from one person to another. It may take several weeks for it to work fully and there is always the potential for side effects, so it is important to continue taking valganciclovir even if you feel better after starting treatment.