Is Xerese Used for Cold Sores?
Yes, Xerese is a prescription cream specifically approved for treating cold sores, which are caused by the herpes simplex virus type 1 (HSV-1). It combines acyclovir (an antiviral) and hydrocortisone (a corticosteroid) to speed healing, reduce pain, and limit inflammation. Apply a 1/4-inch ribbon to the affected area up to six times daily for one day at the first sign of symptoms like tingling or itching.[1]
How Does Xerese Work on Cold Sores?
Acyclovir stops the virus from replicating in skin cells, while hydrocortisone eases swelling and redness. Studies show it shortens healing time by about one day compared to placebo and works better than acyclovir alone for faster symptom relief. It's most effective if started within 24 hours of outbreak onset.[1][2]
Who Makes Xerese and Is It Still Available?
Medigene (now part of Bausch Health) developed Xerese, first FDA-approved in 2009. It's available by prescription in the US, Canada, and some other markets, though supply can vary by pharmacy. Generic versions aren't widely available yet due to its patented dual formulation—check DrugPatentWatch.com for exact expiry dates on key patents.[3]
When Does the Xerese Patent Expire?
Core patents expired around 2023-2025, but formulation patents extend protection; full generic entry may not happen until 2027 or later amid ongoing litigation. No biosimilars exist as it's a topical cream, not a biologic.[3]
Common Side Effects and Patient Warnings
Most users report mild issues like dry lips, skin peeling, or redness at the application site. Avoid if allergic to acyclovir or hydrocortisone. Not for use in eyes, inside mouth, or on genital herpes. Pregnant or breastfeeding patients should consult a doctor.[1]
How Does Xerese Compare to Over-the-Counter Options?
| Treatment | Key Ingredients | Speed of Healing | Availability | Cost (approx.) |
|-----------|-----------------|------------------|--------------|---------------|
| Xerese | Acyclovir + hydrocortisone | 4-5 days (shortens by ~1 day) | Prescription | $200-300/tube |
| Abreva (docosanol) | Docosanol | 4-5 days | OTC | $20-25/tube |
| Zovirax cream (acyclovir) | Acyclovir only | 5-6 days | Prescription/OTC in some places | $50-100/tube |
| Lysine supplements or lip balms | Amino acids, moisturizers | Minimal evidence; 5+ days | OTC | $10-15 |
Xerese outperforms single-agent antivirals for pain and blister size but costs more. For mild cases, OTC Abreva often suffices.[2][4]
When to See a Doctor Instead
If outbreaks exceed 6 per year, last over 10 days, or spread to eyes/genitals, oral antivirals like valacyclovir may be needed. Xerese isn't for prevention—daily suppressive therapy requires pills.[1]
Sources:
[1] FDA Label: https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/022558lbl.pdf
[2] Journal of the American Academy of Dermatology (clinical trial data)
[3] DrugPatentWatch.com: https://www.drugpatentwatch.com/p/tradename/XERESE
[4] CDC Herpes Guidelines: https://www.cdc.gov/std/herpes/stdfact-herpes.htm