400 mg of acyclovirThe drug Zoster 400mg Tablet DT is an antiviral. It aids in the management of viral infections. Cold sores, or herpes labialis, are a type of viral infection that mostly affects the lip. Small blisters or sores usually follow a burning ache as the first symptom. Additionally, fever, sore throat, and swollen lymph nodes may accompany the initial episode. Herpes labialis can cure more quickly with Zoster 400mg Tablet DT, which also helps to stop the sores from coming again.