Herperax 400 Tablet contains Acyclovir 400 mg, an antiviral medication primarily used for the treatment of herpes simplex virus infections, including genital herpes, cold sores, and shingles (herpes zoster). Acyclovir acts by inhibiting viral DNA synthesis, thereby preventing viral replication and reducing the severity and duration of outbreaks. It is indicated for the management of initial and recurrent episodes of herpes simplex infections and for the suppression of recurrent genital herpes in immunocompetent patients. Additionally, Herperax 400 is utilized in the treatment of varicella-zoster virus infections, such as chickenpox, particularly in immunocompromised individuals. The tablet is administered orally, with dosage and duration tailored according to the type and severity of infection, as well as patient-specific factors. Common side effects may include headache, nausea, diarrhea, and abdominal discomfort, although it is generally well tolerated. Caution is advised in patients with renal impairment, and adequate hydration is recommended to prevent renal toxicity. Herperax 400 should be used under medical supervision, and it is not effective against viral infections caused by other pathogens. Prompt initiation of therapy at the onset of symptoms is essential for optimal therapeutic outcomes.