Aciclovir 400mg Cold Sore Treatment UK | Cured Pharmacy

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Cheapest Aciclovir 400mg Cold Sore Treatment UK: Key Benefits

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Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Numark Cold Sore Cream - Aciclovir - UK-licensed prescription Treatment
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Numark Cold Sore Cream - Aciclovir

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Aciclovir - Cold Sore Treatment

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Aciclovir 400mg Benefits for Cold Sore Treatment

Searching for effective aciclovir 400mg cold sore treatment UK options? Aciclovir 400mg tablets offer systemic treatment that works from within, potentially reducing healing time and symptom severity when started early. At Cured Pharmacy, our UK-registered clinical team can assess your suitability for oral aciclovir through a free online consultation, with discreet delivery of genuine UK-licensed medicines.

How Aciclovir 400mg Works Against Cold Sores

Searching for effective aciclovir 400mg cold sore treatment UK options? Aciclovir 400mg tablets offer systemic treatment that works from within, potentially reducing healing time and symptom severity when started early. At Cured Pharmacy, our UK-registered clinical team can assess your suitability for the cheapest aciclovir 400mg cold sore treatment UK through a free online consultation, with discreet delivery of genuine UK-licensed medicines.

Unlike topical creams that work only at the skin surface, oral aciclovir 400mg tablets provide systemic treatment, reaching the site of infection through your bloodstream [2]. This internal approach can be particularly beneficial during the early tingling stage of a cold sore outbreak, when the virus is actively replicating beneath the skin surface.

Clinical studies demonstrate that when aciclovir is started within the first 48 hours of symptom onset, it may reduce healing time by an average of 1-2 days and decrease the severity of pain and lesion size [1][2]. The medication requires activation by viral enzymes, meaning it selectively targets infected cells whilst leaving healthy tissue largely unaffected.

Aciclovir 400mg Dosage for Cold Sore Treatment

The standard aciclovir dosage for cold sores in adults is 400mg taken five times daily for five days [3]. This frequent dosing schedule maintains therapeutic drug levels throughout the day, maximising antiviral activity during the critical early phase of an outbreak.

Timing is crucial for optimal effectiveness. Starting treatment at the first sign of tingling, burning, or itching — known as the prodrome phase — offers the best chance of reducing outbreak severity [3]. Some patients who experience frequent recurrences may be prescribed suppressive therapy, involving lower daily doses to prevent outbreaks, though this requires assessment by a UK prescriber.

It's essential to complete the full five-day course even if symptoms improve earlier, as stopping treatment prematurely may allow the virus to resume replication. Always take aciclovir with a full glass of water and maintain good hydration throughout treatment, as this supports kidney function and drug clearance.

When to Start Aciclovir Treatment

Maximum benefit occurs when treatment begins within 48 hours of the first symptoms appearing [2]. If you recognise the warning signs of an impending cold sore — such as localised tingling, itching, or sensitivity around the lips — contact a UK prescriber immediately to discuss whether aciclovir 400mg tablets are appropriate for your situation. Delayed treatment may still provide some symptom relief, though the reduction in healing time becomes less pronounced.

Aciclovir Tablets vs Aciclovir Cream: Which Is Better?

Both oral aciclovir tablets and topical aciclovir cream are licensed for cold sore treatment in the UK, but they work through different mechanisms and suit different clinical scenarios. Aciclovir cream, such as the Numark Cold Sore Cream available at Cured Pharmacy from £4.49, is applied directly to the affected area five times daily and works locally at the skin surface.

Oral aciclovir 400mg tablets offer systemic treatment, which may be more effective for severe or frequent outbreaks [4]. The tablets reach the site of infection through the bloodstream, potentially providing broader antiviral coverage than topical application alone. Clinical evidence suggests oral aciclovir may reduce healing time more significantly than cream formulations, particularly when started early [2][4].

Your UK prescriber will consider several factors when recommending treatment: outbreak frequency, severity of symptoms, how quickly you can start treatment, and your medical history. Patients experiencing more than six outbreaks per year, or those with particularly painful or prolonged episodes, may benefit more from oral aciclovir. Those with occasional mild outbreaks might find topical cream sufficient. At Cured Pharmacy, our clinical team can help you find the cheapest aciclovir 400mg cold sore treatment UK during a free online consultation.

Choosing Between Oral and Topical Treatment

Your UK prescriber will consider several factors when recommending treatment: outbreak frequency, severity of symptoms, how quickly you can start treatment, and your medical history. Patients experiencing more than six outbreaks per year, or those with particularly painful or prolonged episodes, may benefit more from oral aciclovir. Those with occasional mild outbreaks might find topical cream sufficient. At Cured Pharmacy, our clinical team can assess your individual circumstances during a free online consultation.

Treatment Type Prescription Required Starting Price
Aciclovir 400mg tablets Oral antiviral Yes From £19.99
Numark Cold Sore Cream (Aciclovir) Topical cream No From £4.49
Suppressive aciclovir therapy Oral antiviral (daily) Yes Varies by dose

Common Side Effects and Safety Considerations

Aciclovir 400mg tablets are generally well-tolerated, with most patients experiencing no adverse effects [3]. The most commonly reported side effects include headache, nausea, and mild gastrointestinal upset, which typically resolve without intervention. Taking the medication with food may help reduce stomach discomfort.

Rare but more serious side effects can include dizziness, confusion, or signs of kidney problems such as reduced urine output [3]. Maintaining adequate hydration throughout your treatment course helps support kidney function and reduces the risk of crystalluria, a rare condition where aciclovir crystals form in the urinary tract.

Pricing is transparent and displayed upfront before you complete your consultation. The cheapest aciclovir 400mg cold sore treatment UK is available from £4.49, with the final cost depending on the quantity prescribed by your clinician. We guarantee the lowest prices in the UK for genuine prescription medications, with no hidden fees or subscription charges.

How to Buy Cheapest Aciclovir 400mg Cold Sore Treatment UK

Aciclovir 400mg tablets are prescription-only medication in the UK, requiring clinical assessment by a UK-registered prescriber before dispensing. At Cured Pharmacy, the process is straightforward: complete a free online consultation that takes under three minutes, during which you'll provide relevant medical history and details about your cold sore symptoms.

Our UK-registered clinical team, overseen by Superintendent Pharmacist Tarun Kumar (GPhC 2233073), will review your consultation within hours. If aciclovir is deemed appropriate for your circumstances, your prescription will be issued and dispensed from our GPhC-registered pharmacy (9012511). We supply only genuine UK-licensed medicines with discreet packaging and reliable delivery.

Pricing is transparent and displayed upfront before you complete your consultation. Aciclovir tablets are available from £4.49, with the final cost depending on the quantity prescribed by your clinician. We guarantee the lowest prices in the UK for genuine prescription medications, with no hidden fees or subscription charges.

What to Expect During Your Consultation

The online assessment covers your cold sore history, current symptoms, previous treatments tried, other medications you take, and relevant medical conditions. Be prepared to describe when symptoms started, as early treatment is most effective. Your prescriber may ask about outbreak frequency to determine whether episodic treatment or suppressive therapy is more appropriate. All consultations are confidential and conducted by UK-registered healthcare professionals.

Preventing Future Cold Sore Outbreaks

Whilst aciclovir 400mg effectively treats active outbreaks, understanding your personal triggers can help reduce recurrence frequency. Common triggers include stress, illness, fatigue, sun exposure, hormonal changes, and immune system suppression [1]. Keeping a symptom diary may help you identify patterns specific to your outbreaks.

Sun exposure is a particularly common trigger for cold sores. Using lip balm with SPF 30 or higher, especially during outdoor activities or holidays, may help prevent UV-triggered outbreaks. Managing stress through regular sleep, balanced nutrition, and relaxation techniques can also support your immune system's ability to keep the virus dormant.

For patients experiencing six or more outbreaks per year, suppressive aciclovir therapy may be appropriate [3]. This involves taking a lower daily dose continuously to prevent outbreaks rather than treating them as they occur. Suppressive therapy requires ongoing prescriber supervision and is typically reviewed after 6-12 months. Discuss this option with a UK prescriber if frequent outbreaks significantly impact your quality of life.

Scientific References

  1. Spruance, S. L., et al. (2003). Peroral famciclovir in the treatment of experimental ultraviolet radiation-induced herpes simplex labialis: a double-blind, dose-ranging, placebo-controlled, multicenter trial. Journal of Infectious Diseases, 187(10), 1500-1507. https://doi.org/10.1086/374800 [accessed 8 August 2026]
  2. Spruance, S. L., et al. (1997). Early, patient-initiated treatment of herpes labialis with topical 10% acyclovir. Antimicrobial Agents and Chemotherapy, 41(7), 1524-1528. https://doi.org/10.1128/AAC.41.7.1524 [accessed 8 August 2026]
  3. Electronic Medicines Compendium. (2023). Aciclovir 400mg Tablets - Summary of Product Characteristics. Retrieved from https://www.medicines.org.uk/emc/ [accessed 8 August 2026]
  4. Chi, C. C., et al. (2015). Interventions for prevention of herpes simplex labialis (cold sores on the lips). Cochrane Database of Systematic Reviews, 8, CD010095. https://doi.org/10.1002/14651858.CD010095.pub2 [accessed 8 August 2026]
  5. Pasternak, B., & Hviid, A. (2010). Use of acyclovir, valacyclovir, and famciclovir in the first trimester of pregnancy and the risk of birth defects. JAMA, 304(8), 859-866. https://doi.org/10.1001/jama.2010.1206 [accessed 8 August 2026]

Information on this page is for educational purposes only and is not medical advice. All prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting any new medication.

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Faq

How quickly does aciclovir 400mg work for cold sores?
When started within 48 hours of symptom onset, aciclovir 400mg may reduce healing time by 1-2 days and decrease symptom severity. You may notice reduced pain and swelling within 24-48 hours of starting treatment, though complete healing typically takes 5-7 days.
Can I buy aciclovir 400mg tablets without a prescription in the UK?
No. Aciclovir 400mg tablets are prescription-only medication in the UK and require clinical assessment by a UK-registered prescriber before dispensing. At Cured Pharmacy, you can complete a free online consultation to find the cheapest aciclovir 400mg cold sore treatment UK and determine suitability.
What is the correct aciclovir dosage for cold sores?
The standard dose is 400mg taken five times daily for five days. Your UK prescriber may adjust this based on your individual circumstances, kidney function, and outbreak frequency.
Is aciclovir 400mg better than aciclovir cream for cold sores?
Oral aciclovir tablets provide systemic treatment and may be more effective for severe or frequent outbreaks, whilst topical cream works locally and is suitable for mild, occasional cold sores. Your prescriber can recommend the cheapest aciclovir 400mg cold sore treatment UK option based on your symptoms and medical history.
Can I take aciclovir 400mg if I'm pregnant or breastfeeding?
Aciclovir may be prescribed during pregnancy when the benefits outweigh potential risks. Always inform your UK prescriber if you are pregnant, planning pregnancy, or breastfeeding so they can make an appropriate clinical decision.
How many times can I take aciclovir 400mg for cold sores?
For episodic treatment, you can use aciclovir each time you have an outbreak, starting treatment at the first sign of symptoms. If you experience frequent recurrences, speak to a UK prescriber about suppressive therapy options.
What are the side effects of aciclovir 400mg tablets?
Common side effects include headache, nausea, and mild stomach upset. Serious side effects are rare but can include dizziness, confusion, or kidney problems. Maintain good hydration throughout treatment and contact your prescriber if you experience unusual symptoms.
Can I drink alcohol whilst taking aciclovir 400mg?
There is no direct interaction between aciclovir and alcohol, though drinking may worsen side effects like nausea or dizziness. Moderate alcohol consumption is generally acceptable, but maintaining good hydration is important for kidney function during treatment.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 07 August 2026

Last updated on 07 August 2026.

Review History

Our experts continually monitor new findings in health and medicine, and we update our articles when new information becomes available.

Why this page was updated on 07 August 2026

Content checked and updated as part of our periodic review, to ensure accuracy and currentness.

Current version (07 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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