Herpimax 400 Tablet DT contains Acyclovir 400 mg, an antiviral agent primarily indicated for the treatment of herpes simplex virus infections, including genital herpes, cold sores (herpes labialis), and varicella-zoster virus infections such as shingles (herpes zoster) and chickenpox. Acyclovir acts by inhibiting viral DNA synthesis, thereby preventing viral replication and reducing the severity and duration of outbreaks. Herpimax 400 Tablet DT is a dispersible tablet formulation designed for ease of administration, allowing rapid disintegration in the oral cavity without the need for water, which enhances patient compliance, particularly in cases of difficulty swallowing. The recommended dosage and duration of therapy depend on the specific infection being treated, patient age, and renal function, necessitating adherence to prescribing guidelines. Common adverse effects may include headache, nausea, diarrhea, and occasional dizziness, with serious side effects being rare. Caution is advised in patients with renal impairment, and adequate hydration is recommended to prevent renal toxicity. Herpimax 400 Tablet DT should be used under medical supervision, and it is not indicated for prophylactic use without physician guidance. This medication does not cure herpes infections but helps manage symptoms and reduce viral shedding.