Acyclovir is an antiviral medication. Acyclovir tablets are oral dosage forms that can be used to treat infections with herpes simplex virus or varicella zoster virus. There are two types of herpes simplex virus, type 1, which causes herpes simplex of the skin and mucous membranes, and type 2, which causes herpes of the genitals. Herpes zoster is a disease caused by the varicella-zoster virus, while chickenpox is also a disease caused by varicella-zoster. The initial infection can lead to chickenpox. If the symptoms are not too severe, you can apply acyclovir tablets to be taken orally, adults need to take 0.8g orally each time, 4 times a day orally for 5 days according to the instructions. It can also be extended to 7-10 days according to the relevant information. If it is used to treat herpes zoster, then the corresponding amount is slightly larger, 0.8g per dose, 5 times a day, for 7-10 days.