Vasiclovir generally refers to valacyclovir hydrochloride, which usually costs $5 to $50 a box, and the price cannot be generalized due to the variability in local rates. Valacyclovir hydrochloride is an antiviral drug that can be used to treat varicella zoster and herpes simplex virus type I and II infections. Usually, the price of a box of valacyclovir hydrochloride is around $5 in normal areas, but due to the relatively high charges in first-tier cities, its price may be around $50 for a box, and the specific price needs to be based on the local area charges. Some patients may experience adverse reactions such as dizziness, headache, nausea, vomiting and stomach upset during the use of valacyclovir hydrochloride. Especially those who are allergic to the components of valacyclovir hydrochloride need to be contraindicated. Patients who want to take valacyclovir hydrochloride need to be under the guidance of a physician, do not use the drug without authorization.