The single best thing for a cold sore is a prescription antiviral taken as early as possible, ideally within 48 hours of the first tingle. Antivirals don’t cure the virus, but they shorten healing time and reduce pain more reliably than any over-the-counter product. Beyond that first-line treatment, several OTC options, supplements, and pain relievers can help you get through an outbreak faster and more comfortably.
Why Timing Matters More Than the Treatment
Cold sores go through a predictable sequence: tingling, blistering, oozing, crusting, and healing. That initial tingling or burning sensation, called the prodrome, is your window to act. Every treatment works better when started during this phase. Antiviral medications are most effective when started within 48 hours of the cold sore forming. If you wait until a blister has already opened, you’ll still get some benefit, but you’ve lost the chance to prevent the sore from fully developing.
This is why many people who get frequent cold sores keep a prescription on hand so they can start treatment the moment they feel that familiar tingle.
Prescription Antivirals: The Strongest Option
Oral antiviral medications are the gold standard. They work by blocking the virus from replicating inside your cells, which limits how large and painful the sore becomes and how long it sticks around. Three prescription options are commonly used, and they differ in how much they actually speed healing.
In the largest clinical trials, a short course of famciclovir reduced healing time by 1.8 to 2.2 days compared to placebo, making it the strongest performer in head-to-head comparisons. Valacyclovir, taken as two high doses over 24 hours, shortened healing time by about half a day to just under a day. Acyclovir, the oldest of the three, reduced pain duration by about a day but didn’t significantly shorten healing time when taken orally for active outbreaks.
Your doctor can help you choose between these based on your outbreak frequency and what your insurance covers. For people who get cold sores six or more times a year, daily suppressive therapy with a low-dose antiviral can reduce the number of outbreaks overall.
Over-the-Counter Topical Cream
If you can’t get to a doctor quickly, the main OTC option is a cream containing docosanol (sold as Abreva). It works differently from antivirals. Instead of targeting the virus directly, it strengthens the outer membrane of your skin cells so the virus has a harder time getting in and spreading.
In a large clinical trial of over 700 patients, docosanol shortened healing time by about 18 hours compared to placebo, with a median healing time of 4.1 days. That’s a modest improvement, but it’s the only FDA-approved OTC antiviral cream for cold sores. You apply it five times a day at the first sign of an outbreak and continue until the sore heals. It won’t do much if you start after blisters have already formed.
Pain Relief During an Outbreak
Cold sores hurt, especially during the open-wound stage. Several approaches can take the edge off while you wait for healing.
Topical numbing gels designed for cold sores typically contain lidocaine at around 4%, which temporarily dulls the nerve endings in the area. You can apply these directly to the sore for short-term relief from pain and itching. Standard over-the-counter pain relievers like ibuprofen or acetaminophen also help, particularly if the sore is large or you’re dealing with swelling.
Ice wrapped in a cloth and held against the sore for a few minutes can reduce inflammation and numb the area naturally. Avoid acidic or salty foods that sting on contact, and use a straw for drinks if the sore is near your lip line.
Lysine Supplements
Lysine is an amino acid that competes with arginine, another amino acid the herpes virus needs to replicate. The idea behind supplementation is that tipping the balance toward lysine makes it harder for the virus to thrive.
Clinical evidence is mixed but somewhat encouraging for prevention. One study found that taking 1,000 mg of lysine three times daily for six months decreased infection frequency, symptom severity, and healing time. For ongoing prevention, 1,000 mg daily is the most commonly studied dose. During an active outbreak, some practitioners suggest going up to 3,000 mg per day, though the evidence for treating active sores is weaker than for preventing them.
Lysine is generally well tolerated, but it works better as a long-term prevention strategy than as something you reach for once a sore has already appeared.
Honey as a Topical Treatment
Medical-grade kanuka honey has been tested as a topical cold sore treatment, and the results are surprisingly competitive. A randomized controlled trial published in BMJ Open compared kanuka honey applied topically to standard acyclovir cream. The median time to complete skin healing was 9 days for honey and 8 days for acyclovir, a difference that was not statistically significant. Pain resolution, time to crusting, and time to the open-wound stage were also virtually identical between the two groups.
This doesn’t mean honey is a replacement for prescription oral antivirals, which work from the inside and are more effective overall. But if you’re comparing honey to a topical antiviral cream, the data suggests they perform about the same. Use raw, medical-grade honey rather than processed grocery store varieties if you try this approach.
Light Therapy Devices
A newer option is low-level light therapy, available as at-home devices you hold against the sore. In clinical trials, a 1072-nanometer light device used for three minutes, three times a day over two days reduced median healing time by about 48 hours compared to placebo. The active group healed in roughly 129 hours (about 5.4 days) versus 177 hours (7.4 days) for placebo.
A separate study using a different wavelength (670 nm) found that after seven days of treatment, none of the patients in the laser group had visible lesions remaining, while many in the control group were still healing. The laser group also had fewer recurrences over the following year: 84 episodes compared to 114 in the control group.
These devices are available without a prescription, though they cost more upfront than creams or pills. They may be worth considering if you get frequent outbreaks and want a drug-free option.
Preventing Outbreaks in the First Place
Cold sores are caused by herpes simplex virus type 1, which lives permanently in nerve cells near your jaw after the initial infection. Outbreaks are triggered when the virus reactivates and travels along nerves to the skin surface. Common triggers include stress, lack of sleep, sun exposure on the lips, illness or fever, and hormonal changes.
Wearing lip balm with SPF 30 or higher is one of the simplest and most effective preventive measures, since UV radiation is a well-established trigger. Managing stress, getting consistent sleep, and avoiding known personal triggers can also reduce outbreak frequency. If you notice a pattern (cold sores every time you get sick or every winter), you can talk to your doctor about keeping antivirals on hand or starting a daily suppressive regimen.
When Cold Sores Become Dangerous
Most cold sores are painful but harmless, healing fully within 7 to 10 days. The virus can spread to the eyes, however, causing a condition called ocular herpes. Symptoms include eye pain, redness, light sensitivity, watery eyes, a feeling like something is stuck in your eye, or visible blisters on or around your eyelids. Left untreated, ocular herpes can damage the cornea and affect vision. If you develop any eye symptoms during or after a cold sore outbreak, that warrants urgent medical attention.
Cold sores are contagious from the first tingle until the sore has fully dried and is nearly healed. Avoid kissing, sharing utensils or lip products, and touching the sore with your fingers during this window. If you do touch it, wash your hands immediately to avoid spreading the virus to your eyes or other areas.