The main ingredient of Ganciclovir Ointment is Ganciclovir. Ganciclovir is an antiviral drug that is a nucleoside analogue. It fights all herpes viruses, but has the strongest inhibitory effect on cytomegalovirus. Ganciclovir ointment is generally used to treat herpes zoster, herpes simplex, and chickenpox as a topically applied topical agent. This drug needs to be applied under medical supervision and should not be used without authorization. The most common toxic reaction to ganciclovir is myelosuppression, in addition to mild hepatic impairment, elevated urinary creatinine, anorexia, nausea, and other adverse reactions, but the topical ointment has a low absorption rate and has less chance of causing adverse reactions.