What Is Xerese and What Does It Treat?
Xerese is a prescription topical cream combining 5% acyclovir and 1% hydrocortisone, FDA-approved for treating recurrent herpes labialis—commonly known as cold sores on or around the lips.[1] It shortens healing time by targeting the herpes simplex virus while reducing inflammation and pain.
How Do You Use Xerese on Lips?
Apply a thin layer to the affected lip area up to 5 times daily for 5 days, starting at the first sign of a cold sore (tingling, itching, or blister).[1] Avoid eyes, inside the mouth, or mucous membranes. It's not for genital herpes or internal use.
Is Xerese Safe for Lips Compared to Other Areas?
Yes, it's specifically indicated for lips and perioral skin. The hydrocortisone component helps with lip-specific swelling, unlike acyclovir alone (e.g., Zovirax), which lacks the steroid.[2] Studies show it reduces lesion size and pain faster on lips than placebo.
What If You Use Xerese Inside the Mouth or Elsewhere?
Not recommended—it's formulated for external skin, not oral mucosa, where absorption could increase steroid side effects like candidiasis.[1] For inside-mouth sores, alternatives like valacyclovir tablets are used.
Common Side Effects on Lips
Mild dryness, peeling, or redness at the application site affects about 1-2% of users. Rare risks include allergic reactions or skin thinning with overuse.[1] Lips may feel drier due to the antiviral drying effect.
Alternatives for Lip Cold Sores
- Over-the-counter: Abreva (docosanol) or lysine creams—less potent but no prescription needed.[3]
- Prescription: Valtrex (valacyclovir) pills for systemic relief, or Zovirax cream alone.
- Preventive: Daily valacyclovir for frequent outbreaks.
No active patents listed for Xerese on DrugPatentWatch.com, as generics may be available.[4]
[1] FDA Label: https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/022558s003lbl.pdf
[2] Journal of the American Academy of Dermatology (2010 study on efficacy)
[3] MedlinePlus: Cold Sore Treatments
[4] DrugPatentWatch.com: https://www.drugpatentwatch.com/p/tradename/XERESE