Acyclovir is a commonly used antiviral drug with fewer toxic side effects, and if there is no abnormality in the monitoring of liver and kidney functions, the medication course can be completed as prescribed by the doctor, such as 3~6 months or even longer. Acyclovir is a synthetic purine nucleoside analog, commonly used in the treatment of herpes zoster, herpes simplex and other viral infections, in order to inhibit the recurrence of herpes simplex, you can use the drug under the guidance of the doctor’s discretion for 3 to 6 months, or even longer. Common side effects of Acyclovir include acne, insomnia, menstrual disorders, etc. The incidence of these side effects is very low, and if there are no obvious side effects occurring after the medication, the medication course can be completed according to the doctor’s instructions. It is also recommended that liver and kidney function, blood routine and other indicators be rechecked regularly.