Herpex 200mg Tablet contains Acyclovir 200mg, an antiviral agent used primarily for the treatment of infections caused by herpes simplex virus types 1 and 2, as well as varicella-zoster virus. Acyclovir acts by inhibiting viral DNA polymerase, thereby preventing viral replication and reducing the severity and duration of outbreaks. Herpex is indicated for the management of herpes simplex labialis (cold sores), genital herpes, and for the treatment and suppression of varicella-zoster infections such as shingles and chickenpox. The tablet formulation allows for convenient oral administration, ensuring adequate systemic absorption. Dosage and duration of therapy should be individualized based on the type and severity of infection, patient age, renal function, and immune status. Common side effects may include headache, nausea, diarrhea, and abdominal discomfort, though it is generally well tolerated. Caution is advised in patients with renal impairment, and adequate hydration should be maintained to prevent renal toxicity. Herpex should be used under medical supervision, particularly in immunocompromised individuals, pregnant or breastfeeding women. This medication does not cure herpes infections but helps to manage symptoms and reduce viral shedding, thereby decreasing transmission risk.