**Herpex 5% Cream 5g** contains **Acyclovir 5% w/w**, an antiviral medication. It is used to help manage and treat **cold sores** caused by the **Herpes simplex virus** in adults and adolescents over 12 years of age. This cream can help speed up the healing of cold sores and reduce the duration of associated pain. Cold sores are small, fluid-filled blisters that typically appear around the mouth, often accompanied by sore lips, ulcers, or rashes. Before you start using **Herpex 5% Cream 5g**, it's important to tell your doctor if you have a weakened immune system, existing cold sores inside your mouth, or if you experience frequent cold sore outbreaks (more than 4 times a year). If you are pregnant or breastfeeding, please consult your doctor before using **Herpex 5% Cream 5g**, as its use is generally not recommended unless clearly necessary due to the possibility of **Acyclovir** passing into breast milk. Common side effects reported with **Herpex 5% Cream 5g** include skin rash, itching, hives, mild dryness or flaking of the skin, and dry lips. If any side effects worsen or continue for an extended period, please contact your doctor for advice.