Acyclovir tablets are a type of acyclovir preparation, which is an oral tablet. It is active against herpes simplex virus (HSV), varicella-zoster virus (VZV), EBV, and cytomegalovirus. Its main mechanism of action is the ability to inhibit the replication of viral DNA, as well as cause interruption of DNA strand extension. Its anti-herpes virus potency is 160 times stronger than that of adenosine and 10 times stronger than that of iodoside. The main indications are: 1. Herpes simplex: clinically used for herpes simplex caused mainly by herpes simplex virus type I and genital herpes caused by herpes simplex virus type II. Herpes simplex is a viral skin disease, acyclovir tablets can be used for systemic antiviral therapy; genital herpes is mostly used for topical application of acyclovir cream. 2, chickenpox, herpes zoster. Herpes zoster occurs in middle-aged and elderly people, and the application of acyclovir tablets can be used for antiviral treatment; chickenpox, for those with extensive rashes and serious conditions, can be treated with antiviral agents such as acyclovir tablets. 3, meningoencephalitis, hepatitis caused by herpes virus. 4, oral aphthous ulcers: for some severe oral aphthous ulcers have a preventive effect. 5.Other: plantar warts, recurrent erythema multiforme, herpetic eczema, lymphoma-like papulosis, hairy mucous membrane leukoplakia. In summary, acyclovir tablets is an antiviral agent, if there is discomfort, but also need to promptly seek medical examination, under the guidance of professional doctors to apply.