Herpex 5% Cream contains Acyclovir 5% w/w, an antiviral agent indicated for the topical treatment of herpes simplex virus infections, including herpes labialis (cold sores) and genital herpes. Acyclovir acts by inhibiting viral DNA synthesis, thereby limiting viral replication and spread. This cream is intended for external use and should be applied at the earliest sign of an outbreak, such as tingling, itching, or redness, to maximize therapeutic efficacy. Clinical studies have demonstrated that Herpex 5% Cream reduces the duration of symptoms, accelerates lesion healing, and decreases viral shedding. It is generally well tolerated, with adverse effects limited primarily to mild local reactions such as burning, stinging, or irritation at the application site. The recommended dosage involves applying a thin layer of the cream five times daily at approximately four-hour intervals, excluding nighttime, for a duration of 5 days or as directed by a healthcare professional. Herpex 5% Cream is contraindicated in patients with known hypersensitivity to acyclovir or any component of the formulation. Caution is advised in immunocompromised individuals, and use during pregnancy or lactation should be under medical supervision. Proper hygiene should be maintained during application to prevent autoinoculation or transmission to others.