Acyclovir ointment is clinically used for the treatment of herpes simplex, genital herpes and shingles. Acyclovir is a purine nucleoside antiviral drug, the mechanism of action is to interfere with viral DNA polymerase, inhibit viral replication, herpes simplex virus, varicella zoster virus, cytomegalovirus and other inhibitory effect. Because the half-life of acyclovir is relatively short, local topical application, 5 times a day, some patients may have localized itching, burning pain, rash and other adverse reactions, pregnant women, lactating women should be cautious, allergic to the product is prohibited.