Zoster 400mg Tablet DT contains Acyclovir 400mg, an antiviral agent indicated for the treatment of infections caused by herpes viruses, including herpes zoster (shingles), herpes simplex virus types 1 and 2, and varicella-zoster virus. Acyclovir acts by inhibiting viral DNA polymerase, thereby preventing viral replication and reducing the severity and duration of symptoms. Zoster 400mg Tablet DT is formulated as a dispersible tablet, facilitating ease of administration and rapid onset of action, particularly beneficial for patients with swallowing difficulties. This medication is primarily used in the management of acute herpes zoster infections to alleviate pain, promote lesion healing, and reduce the risk of complications such as postherpetic neuralgia. It is also employed in the treatment and suppression of recurrent genital herpes and other herpes simplex infections. The dosage and duration of therapy depend on the indication, severity of infection, and patient-specific factors such as renal function. Common adverse effects include headache, nausea, and gastrointestinal discomfort, while serious side effects are rare but may involve renal toxicity and neurotoxicity, especially in patients with impaired renal function. Zoster 400mg Tablet DT should be used under medical supervision, with dosage adjustments as necessary to ensure safety and efficacy.