Aciclovir Cream is a topical antiviral medication containing Aciclovir, which works by inhibiting herpes virus DNA synthesis. Indicated for herpes simplex (such as cold sores and genital herpes) and herpes zoster (including chickenpox and shingles), it enters virus-infected cells, gets phosphorylated by viral thymidine kinase, and competitively blocks viral DNA polymerase to halt replication. With high selectivity for viruses and low toxicity to normal cells, it is applied thinly to clean affected areas every 2 hours (4-6 times daily for 5-10 days as directed), avoiding eyes and oral mucosa. Clinically recommended as a first-line treatment, it rapidly relieves burning and tingling, shortens outbreak duration, and is suitable for adults and children over 2 years old.