First of all, valacyclovir is a derivative of acyclovir, which is a commonly used antiviral drug in clinical practice. Herpes is a series of viral diseases caused by herpes simplex virus or varicella-zoster virus infection. Herpes simplex virus can cause manifestations such as perioral herpes, facial herpes, and genital herpes. The so-called varicella-zoster virus infection can generally cause herpes zoster. Both types of diseases can be treated clinically with vaxilovir, for example, genital herpes caused by herpes simplex virus infection can be treated orally with vaxilovir. In some cases, such as recurrent genital herpes, vaxilovir can also be used as a low-dose maintenance treatment for a long time.