How to get rid of cold sores
- Why nothing works "instantly", and what a realistic timeline looks like
- Why acting at the first tingle matters more than anything else
- Which over-the-counter options are worth using
- Whether lysine, Vaseline, Sudocrem, and ice actually help
- When tablets may be more appropriate than cream
- How to avoid spreading the virus during an outbreak
- When to see a doctor
- Is there anything that gets rid of cold sores instantly?
- Why acting early matters more than anything else
- Over-the-counter options worth considering
- Do popular home remedies actually work?
- When might tablets be a better option than cream?
- Preventing the virus from spreading during an outbreak
- How long do cold sores usually take to heal?
- When should you see a doctor about a cold sore?
- Final thoughts
Is there anything that gets rid of cold sores instantly?
No. Searches for "what kills cold sores instantly" or "how to get rid of cold sores in 24 hours" reflect an understandable wish, but no cream, tablet, or home remedy clears a cold sore within a day. Cold sores are caused by the herpes simplex virus, which remains in the body permanently once acquired, so treatment cannot eliminate the virus itself. It can only shorten and ease the current outbreak, typically by a day or two rather than overnight. Setting this expectation early makes it easier to use treatment consistently rather than chasing products marketed as miracle cures.
Why acting early matters more than anything else
The most effective step is applying antiviral cream containing aciclovir at the very first sign of a cold sore, before any blister is visible. Most people notice tingling, itching, or mild burning hours before the sore appears. Applying aciclovir cream at this stage gives the antiviral the best chance of interrupting the outbreak early. Once the blister has formed, the cream can still help, but the benefit is smaller.
Good to know
Aciclovir 5% cream is available in the UK as a pharmacy medicine in small pack sizes, so it can be bought without a prescription. See our Aciclovir 5% Cream page for guidance on choosing and using it.
Over-the-counter options worth considering
- Antiviral cream (aciclovir): targets the virus itself, most effective when started early
- Cold sore patches or dressings: protect the area from friction and contamination, and may reduce the risk of spreading the virus
- Pain relief: paracetamol or ibuprofen, taken per standard OTC guidance, for discomfort
These can be combined: a patch protects the area while cream treats the virus and simple pain relief manages discomfort.
Do popular home remedies actually work?
It is worth being straightforward about the evidence for each remedy rather than validating it simply because it is popular.
- Lysine. A widely used supplement, but the evidence for lysine and cold sores is mixed and limited. It is not proven and should not replace antiviral cream.
- Vaseline. Petroleum jelly does not treat the virus. It keeps the area moisturised and may reduce cracking, making it a comfort measure rather than a treatment.
- Sudocrem. A soothing, barrier-forming product rather than an antiviral. It is not evidenced as a cold sore treatment, though some find it comforting on irritated skin.
- Ice or a cold compress. Applied briefly, never directly to bare skin, this can reduce swelling and discomfort in the early stages, again addressing comfort rather than the virus.
Good to know
Comfort measures such as Vaseline, Sudocrem, and ice are fine to use alongside antiviral treatment, but they are not substitutes for it if the aim is to genuinely shorten the outbreak.
When might tablets be a better option than cream?
For most people, cream started early is enough. Tablets containing aciclovir or valaciclovir may suit outbreaks that are frequent, unusually severe, or slow to heal, since oral treatment acts systemically rather than only at the site applied. Both are prescription-only medicines in the UK and require an assessment by a registered prescriber to confirm suitability and dosing. See our Aciclovir 400mg for Cold Sores and Valaciclovir 500mg for Cold Sores pages for more detail.
Warning !
Do not attempt to source aciclovir or valaciclovir tablets without a prescription. A prescriber assessment ensures the treatment and dose are appropriate for you.
Preventing the virus from spreading during an outbreak
Herpes simplex virus is contagious while a cold sore is active, particularly from the tingling stage until it has fully crusted over.
- Avoid touching or picking at the sore
- Avoid kissing and sharing cups, cutlery, towels, or lip products
- Wash your hands after applying any product
- Use a clean cotton bud rather than your fingers, to avoid transferring the virus elsewhere
How long do cold sores usually take to heal?
Most cold sores heal within seven to ten days without any treatment at all. Treatment, whether cream, patches, or tablets, aims to shorten this window and ease discomfort along the way, rather than eliminate the sore overnight.
When should you see a doctor about a cold sore?
- Outbreaks that are very frequent
- Any sign of spreading to or near the eye
- No improvement after seven to ten days
- Anyone who is immunocompromised, as outbreaks can be more severe and prolonged
Warning !
A cold sore near the eye needs prompt medical assessment, as herpes simplex infection of the eye can be serious. Seek advice the same day.
Final thoughts
There is no way to make a cold sore disappear instantly, but there is a genuinely effective approach: apply antiviral cream at the very first tingle, support healing with sensible comfort measures, and consider tablets under prescriber guidance for frequent or severe outbreaks. Most cold sores heal within seven to ten days regardless of treatment, so the realistic aim is to make that period shorter and more comfortable.
DoktorABC connects UK patients with licensed prescribers who can assess suitability for cold sore tablets and issue private prescriptions where clinically appropriate.
FAQ
What kills cold sores instantly?
Nothing does. Antiviral cream applied at the first tingle is the most effective way to shorten and ease an outbreak.
How do you get rid of a cold sore fast at home?
Apply antiviral cream at the first tingle, use a cold sore patch to protect the area, and take paracetamol or ibuprofen if needed.
Does Vaseline help cold sores?
It keeps the area moisturised and may reduce cracking, but does not treat the virus. Use it alongside, not instead of, antiviral cream.
Does Sudocrem help cold sores?
It can soothe irritated skin but is not an antiviral treatment, so it does not shorten the outbreak.
Does lysine work for cold sores?
The evidence is mixed and limited. It is not proven and should not replace antiviral cream.
When should I use tablets instead of cream?
For frequent, severe, or slow-healing outbreaks. Tablets are prescription-only and require a prescriber assessment.
How long do cold sores last?
Most heal within seven to ten days without treatment. Treatment aims to shorten and ease this, not eliminate it instantly.
When should I see a doctor about a cold sore?
If outbreaks are very frequent, the sore spreads near the eye, there is no improvement after the usual timeframe, or you are immunocompromised.
The DoktorABC medical advisory board
Dr. Roland Ruiken
Medical advisor, Norway
Dr. Viktor Simunovic
Medical advisor, Croatia