Ocuvir 400 DT Tablet contains Acyclovir 400 mg, an antiviral agent indicated for the treatment of infections caused by herpes viruses, including herpes simplex virus types 1 and 2, varicella-zoster virus, and other susceptible viral infections. Acyclovir acts by inhibiting viral DNA polymerase, thereby preventing viral DNA synthesis and replication. Ocuvir 400 DT is commonly prescribed for the management of herpes simplex keratitis, genital herpes, varicella (chickenpox), and herpes zoster (shingles). The tablet is designed as a dispersible formulation to facilitate ease of administration and rapid absorption. It is recommended to initiate therapy at the earliest signs of infection to achieve optimal therapeutic outcomes. Dosage and duration of treatment vary depending on the indication, severity of infection, and patient’s clinical status. Common adverse effects may include gastrointestinal disturbances such as nausea, vomiting, and diarrhea, as well as headache and dizziness. Caution is advised in patients with renal impairment, and adequate hydration should be maintained to prevent nephrotoxicity. Ocuvir 400 DT should be used under medical supervision, and patients are advised to complete the full course of therapy even if symptoms improve to prevent viral resistance and recurrence.