Both vasiclovir and famciclovir are antiviral medications that can treat shingles with similar results. 1. Valacyclovir is mainly used to treat herpes zoster and herpes simplex virus infections, and can also be used to prevent recurrence of herpes simplex virus infections. Adverse reactions such as headache, dizziness, nausea, abdominal pain, vomiting, dysmenorrhea, depression, arthralgia, fatigue, rash, etc. may occur in some patients taking this product, and hemolytic uremic syndrome and acute renal failure may occur in severe cases. This product is contraindicated in patients who are allergic to any component of the drug such as acyclovir and vasiclovir. 2. Famciclovir is mainly used for the treatment of herpes zoster, primary genital herpes, some patients may experience headache, abnormal sensation, fatigue, nausea, diarrhea, rash, dysmenorrhea and other adverse reactions after taking the drug, and in severe cases, renal failure, anaphylactic shock and so on. Allergic to the product, allergic to Penciclovir patients are prohibited. It is recommended that patients who are unwell go to a regular hospital in time, and follow the doctor’s instructions for symptomatic treatment with medication.