Aciclovir, also known as acyclovir, [4] is an antiviral medication. [5] It is primarily used for the treatment of herpes simplex virus infections, chickenpox, and shingles. [6] Other uses include the prevention of cytomegalovirus infections following transplant, and severe complications of Epstein–Barr virus infection. [6][7] It can be taken by mouth, applied as a cream, or injected. [6. Acyclovir is an antiviral drug. It slows the growth and spread of the herpes virus. It will not cure herpes, but it can lessen the symptoms of the infection. Acyclovir: learn about side effects, dosage, special precautions, and more on MedlinePlus Aciclovir: Infórmate sobre efectos secundarios, dosis, precauciones y más en MedlinePlus Description Acyclovir is used to treat shingles (herpes zoster), genital herpes, and chickenpox. Although acyclovir will not cure shingles or genital herpes, it does help relieve the pain and discomfort and helps the sores heal faster. This medicine is available only with your doctor's prescription. Acyclovir is a nucleoside analog that inhibits replication of herpes simplex virus and varicella-zoster virus. Detailed Acyclovir dosage information for adults and children. Includes dosages for Herpes Simplex Labialis, Herpes Simplex - Suppression, Herpes Zoster and more; plus renal, liver and dialysis adjustments. Aciclovir tablets are used to treat infections such as cold sores, shingles, chickenpox and genital herpes. When taking aciclovir tablets: start taking the tablets as soon as possible after you've been prescribed them follow your doctor's instructions about how many tablets to take each day and when to take them dissolve the tablet in a glass of water and stir before drinking, or you can. View aciclovir information, including dose, uses, side-effects, renal impairment, pregnancy, breast feeding and directions for administration. Find patient medical information for Acyclovir (Zovirax) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings.