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Acyclovir, commonly known by the brand name Zovirax, is an antiviral medication prescribed for the treatment of various herpes virus-related infections, including cold sores (herpes labialis), genital herpes, shingles (herpes zoster), and chickenpox (varicella) in individuals aged two years and older. It is available in multiple forms such as oral capsules, tablets, suspensions, topical creams, ointments, and buccal tablets, each tailored for specific conditions and age groups. Acyclovir works by inhibiting an enzyme called DNA polymerase that the herpes simplex virus (HSV) and varicella-zoster virus (VZV) need to replicate. By blocking this enzyme, acyclovir prevents the virus from multiplying, which helps reduce the severity and duration of outbreaks. While it is not a cure, it aids in faster healing of sores, prevents new sores from forming, and alleviates associated pain and itching. Patients are advised to follow their healthcare provider's instructions regarding dosage and application, and discuss any potential side effects, which may include nausea, vomiting, diarrhea for oral forms, and skin irritation for topical forms. Acyclovir is a prescription-only medication and is not available over the counter. Always consult healthcare professionals before starting any new medication regimen.