Cold sores (oral herpes, or "fever blisters") are small, painful blisters on or around the lips caused by the herpes simplex virus, usually type 1 (HSV-1) — a very common, lifelong infection that has no cure. The good news is that an outbreak almost always heals on its own, typically within 1 to 2 weeks, even without treatment. Medicines do not eliminate the virus; they can modestly speed healing and ease symptoms, and they work best if started at the very first tingle, before a blister forms. Most cold sores can be managed at home with over-the-counter products and simple self-care.
Available without a prescription — follow each label.
Docosanol 10% cream Abreva Topical antiviral (OTC) | The only FDA-approved over-the-counter topical antiviral for cold sores. Per the Drug Facts label, it shortens healing time and the duration of symptoms when applied at the first sign (the tingle) and rubbed in gently 5 times a day until healed. For adults and children 12 and over. External use only — do not use in or near the eyes, and avoid applying inside the mouth. Stop and seek help right away for any sign of an allergic reaction (rash, hives, facial swelling, wheezing or trouble breathing). The benefit is real but modest — on the order of hours to about a day faster healing. |
Tylenol Analgesic / antipyretic | Used only to ease the pain of a cold sore — it does nothing to the virus or to healing. NHS and MedlinePlus list it as appropriate pain relief. Follow the label dose and do not combine multiple products containing acetaminophen. |
Advil, Motrin NSAID analgesic | An alternative for pain and swelling, per NHS and MedlinePlus. Take with food; avoid if you have stomach ulcers, kidney problems, or have been told to avoid NSAIDs. Does not treat the infection itself. |
Sunscreen lip balm (SPF 15+, e.g. with zinc oxide) various Topical sunscreen / lip protectant | Not a treatment but a prevention tool: sun exposure can trigger outbreaks, so NHS and MedlinePlus recommend a sunblock lip balm (SPF 15 or above, or one containing zinc oxide) before being outdoors. It can also help soften and protect healing skin. |
A doctor may prescribe these — not for self-treatment.
Oral acyclovir Zovirax Oral antiviral (nucleoside analogue) | A doctor may prescribe oral antiviral tablets for cold sores that are very large, very painful, frequently recurring, or slow to heal. Most effective when started early in an outbreak. Requires diagnosis and a prescription — never self-start an antiviral; dosing and suitability depend on your kidney function, other conditions, and pregnancy status. |
Oral valacyclovir Valtrex Oral antiviral (prodrug of acyclovir) | A clinician-prescribed antiviral. MedlinePlus lists it among the oral antivirals (with acyclovir and famciclovir) that work best when started at the first warning signs. For people with frequent outbreaks, a doctor may consider daily suppressive use to help reduce recurrences — this is a medical decision, not an over-the-counter one. |
Oral famciclovir Famvir Oral antiviral (prodrug of penciclovir) | Another antiviral a doctor may choose, per MedlinePlus. As with all prescription antivirals, it requires medical evaluation, particularly for pregnant people, newborns, or anyone with a weakened immune system, who the NHS notes may need specialist or hospital care. |
Prescription topical antivirals (e.g. acyclovir or penciclovir cream) Zovirax cream, Denavir Topical antiviral | Prescription-strength antiviral creams a clinician may recommend. MedlinePlus notes that antiviral skin creams are expensive and often shorten an outbreak by only a few hours to a day, so a doctor weighs whether they add value over OTC options. |
For a typical, occasional cold sore in an otherwise healthy adult, no prescription is needed — it will heal on its own in 1 to 2 weeks. The single most useful step is to act at the first tingle or itch (before the blister appears): that is when OTC docosanol (Abreva) is most likely to help, and even then the benefit is measured in hours to a day, not a cure. Add acetaminophen or ibuprofen for pain, a cold compress or ice for relief, and an SPF 15+ lip balm to help prevent sun-triggered flares. Avoid acidic, salty, or spicy foods if they sting, keep the area clean, dab (don't rub) creams on, and do not pick at the scab. Cold sores are contagious until fully healed — avoid kissing and sharing cups, utensils, towels, or lip products, and wash your hands after touching the sore. Consider asking a doctor about prescription oral antivirals if your cold sores are large, very painful, slow to heal, or keep coming back, since these are the situations where a prescription is most worthwhile. Be realistic about expectations: no available medicine clears HSV from the body, and for many people the practical choice is supportive self-care.
Seek medical advice if: a cold sore has not started to heal after about 10 days to 2 weeks; it is unusually large, spreading, or extremely painful; you have frequent or severe recurrences; or you develop sores or symptoms near or in the eye (eye involvement can threaten vision — treat this as urgent). Get medical care urgently if you have a weakened immune system (e.g. from chemotherapy, HIV, or immune-suppressing drugs), if a newborn baby is exposed or develops blisters, or if you are pregnant — the NHS notes these groups may need specialist or hospital treatment. Also seek help right away for any sign of a severe allergic reaction to a treatment, such as hives, facial swelling, wheezing, or trouble breathing. For a first-ever or unusually widespread mouth outbreak — especially in a child who has painful gums and sores and cannot eat or drink — contact a clinician.
General reference, not medical advice, and not a substitute for your doctor or pharmacist. The right choice depends on your symptoms, health conditions, age, and other medicines — always read each label and confirm before taking anything.
Cold sore patches / protective ointments various (e.g. hydrocolloid patches) Skin protectant / barrier | A pharmacist option noted by NHS to cover and protect the sore while it heals and reduce the urge to touch it. These soothe and shield but do not fight the virus. The NHS notes that electronic light/laser cold-sore devices lack good evidence that they work. |