Aciclovir Dosage for Cold Sores UK | Cured Pharmacy

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Aciclovir Dosage Strengths for Cold Sores Treatment

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Aciclovir Dosage Strengths for Cold Sores Treatment

Published on: June 03, 2026

Understanding the correct aciclovir dosage for cold sores UK treatment is essential for effective symptom management. At Cured Pharmacy, our UK-registered clinical team provides evidence-based guidance on both topical and oral aciclovir formulations, with treatments available from £4.49 including free online consultation.

How Aciclovir Works Against Cold Sores

Aciclovir is an antiviral medication that targets the herpes simplex virus type 1 (HSV-1), the primary cause of cold sores. Once absorbed into infected cells, aciclovir is converted into its active form and inhibits viral DNA polymerase, effectively stopping the virus from replicating [1]. This mechanism reduces the severity and duration of outbreaks when treatment begins early.

Clinical studies demonstrate that aciclovir can reduce healing time by an average of 1-2 days when applied at the first sign of tingling or redness [1][2]. The medication is available in two main formulations in the UK: topical 5% cream for localised application and oral tablets (typically 200mg or 400mg) for systemic treatment.

Aciclovir 5% Cream: Dosage and Application

Aciclovir 5% cream is the most commonly used topical treatment for cold sores in the UK. The standard dosage involves applying a thin layer to the affected area five times daily (approximately every four hours whilst awake) for five days [2]. Treatment should ideally commence at the first prodromal symptoms—the tingling, itching, or burning sensation that precedes visible blisters.

Each application requires only a small amount of cream to cover the cold sore and surrounding area. Wash your hands thoroughly before and after application to prevent viral spread. The 5% concentration means that 5 grams of aciclovir are present in every 100 grams of cream, providing effective localised antiviral action without systemic absorption [2].

Maximising Cream Effectiveness

For optimal results with aciclovir cream, begin treatment within the first 24 hours of symptom onset. Apply the cream directly to the cold sore lesion and approximately 5mm of surrounding skin. Avoid touching the tube tip to the affected area to maintain product sterility. Continue the full five-day course even if symptoms improve earlier, as premature discontinuation may allow viral replication to resume.

Oral Aciclovir Tablets: Dosage Strengths

Oral aciclovir tablets provide systemic treatment for cold sores and are particularly beneficial for patients experiencing frequent or severe outbreaks. The standard UK dosage for episodic cold sore treatment is 200mg five times daily for five days, though some prescribers may recommend 400mg three times daily as an alternative regimen [3]. Both approaches deliver similar clinical outcomes when initiated early.

For suppressive therapy in patients with frequent recurrent cold sores (typically six or more outbreaks annually), a lower maintenance dose of 400mg twice daily may be prescribed [3]. This prophylactic approach can reduce outbreak frequency by up to 75% in clinical trials, though it requires ongoing assessment by a UK prescriber to balance benefits against long-term medication use.

When Tablets Are Preferred Over Cream

Your UK prescriber may recommend oral aciclovir tablets rather than topical cream if you experience cold sores in multiple locations, have frequent recurrent outbreaks, or possess a compromised immune system. Tablets provide whole-body antiviral coverage and are particularly effective when cold sores affect areas inside the mouth or on the lips where cream application proves difficult. All oral aciclovir prescriptions require clinical assessment at Cured Pharmacy to ensure appropriate dosing for your specific circumstances.

Formulation Strength Dosage Frequency Starting Price
Aciclovir Cream 5% topical 5 times daily for 5 days From £4.49
Aciclovir Tablets (episodic) 200mg oral 5 times daily for 5 days From £19.99
Aciclovir Tablets (alternative) 400mg oral 3 times daily for 5 days From £19.99
Aciclovir Tablets (suppressive) 400mg oral Twice daily (ongoing) From £19.99

Aciclovir Dosage for Cold Sores: Comparing Your Options

The choice between aciclovir cream and tablets depends on several clinical factors including outbreak frequency, severity, location, and individual patient circumstances. Topical 5% cream offers convenient over-the-counter access for occasional cold sores and minimises systemic medication exposure, making it suitable for most patients experiencing infrequent outbreaks [2].

Oral tablets require a prescription but provide more comprehensive antiviral coverage. They're particularly valuable for patients with recurrent cold sores, those who find topical application impractical, or individuals seeking suppressive therapy. Clinical evidence shows both formulations reduce healing time when initiated promptly, though tablets may offer marginally greater efficacy in severe cases [3][4].

Adjusting Aciclovir Dosage: Special Considerations

Certain patient populations require modified aciclovir dosing to ensure both safety and efficacy. Individuals with impaired kidney function need dose adjustments because aciclovir is primarily eliminated through renal excretion [4]. Your UK prescriber will calculate appropriate dosing based on your estimated glomerular filtration rate (eGFR) if you have known kidney disease.

Elderly patients may also require dosage modifications due to age-related changes in kidney function. Pregnant and breastfeeding women can generally use aciclovir under medical supervision, as the medication has an established safety profile, though the prescriber will assess individual risk-benefit ratios [4]. Always disclose your complete medical history during your online consultation at Cured Pharmacy to ensure safe prescribing.

Dosage Timing and Missed Applications

Consistent dosing intervals maximise aciclovir's antiviral effectiveness. If you miss a cream application, apply it as soon as you remember and continue with your regular schedule. For oral tablets, take the missed dose immediately unless it's nearly time for your next scheduled dose—never double up to compensate. Set phone reminders to maintain the five-times-daily schedule for both cream and 200mg tablet regimens, as irregular dosing reduces treatment efficacy.

Aciclovir Dosage for Cold Sores: Safety and Side Effects

Aciclovir is generally well-tolerated at standard UK dosages for cold sore treatment. Topical 5% cream may cause mild local reactions including stinging, burning, or temporary skin dryness in approximately 1-5% of users [2]. These effects are usually transient and resolve without intervention. Avoid applying cream to broken skin beyond the cold sore lesion itself.

Oral aciclovir tablets carry a slightly broader side effect profile, with the most common being headache, nausea, and gastrointestinal discomfort affecting roughly 5-10% of patients [3][4]. Rare but serious effects include kidney dysfunction and neurological symptoms, particularly at higher doses or in patients with pre-existing renal impairment. Maintain adequate hydration when taking oral aciclovir, and contact your prescriber if you experience unusual symptoms. All prescription aciclovir requires clinical assessment by a UK-registered prescriber at Cured Pharmacy.

Scientific References

  1. Spruance, S. L., et al. (1997). Acyclovir cream for treatment of herpes simplex labialis: results of two randomized, double-blind, vehicle-controlled, multicenter clinical trials. Antimicrobial Agents and Chemotherapy, 41(7), 1254–1257. https://doi.org/10.1128/AAC.41.7.1254 [accessed 13 August 2026]
  2. Medicines and Healthcare products Regulatory Agency. (2021). Aciclovir 5% cream: Summary of Product Characteristics. GOV.UK. https://www.gov.uk/guidance/aciclovir [accessed 13 August 2026]
  3. Rooney, J. F., et al. (1993). Oral acyclovir to suppress frequently recurrent herpes labialis. A double-blind, placebo-controlled trial. Annals of Internal Medicine, 118(4), 268–272. https://doi.org/10.7326/0003-4819-118-4-199302150-00004 [accessed 13 August 2026]
  4. British National Formulary. (2024). Aciclovir: Medicinal forms and dosing. BMJ Group and Pharmaceutical Press. https://bnf.nice.org.uk/drugs/aciclovir/ [accessed 13 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

What is the correct aciclovir dosage for cold sores?
For topical treatment, apply aciclovir 5% cream five times daily for five days. For oral tablets, the standard dose is 200mg five times daily or 400mg three times daily for five days, subject to prescriber assessment.
Should I use aciclovir cream or tablets for cold sores?
Aciclovir cream suits occasional, localised cold sores and is available over the counter. Tablets require a prescription and are recommended for frequent outbreaks, severe symptoms, or when topical application is impractical.
How quickly does aciclovir work on cold sores?
When started at the first sign of symptoms, aciclovir can reduce healing time by 1-2 days on average compared to untreated cold sores. Visible improvement typically occurs within 2-3 days of consistent use.
Can I use more aciclovir cream to speed up healing?
No. Applying more than the recommended five-times-daily dosage does not enhance effectiveness and may increase local irritation. Follow the standard aciclovir dosage for cold sores UK guidance for optimal results.
What strength of aciclovir is best for cold sores?
Aciclovir 5% cream is the standard topical strength for cold sores. For oral treatment, 200mg or 400mg tablets are equally effective when dosed appropriately—your UK prescriber will determine the most suitable strength for your needs.
How long should I continue aciclovir treatment?
Complete the full five-day course for episodic treatment, even if symptoms improve earlier. For suppressive therapy with 400mg twice daily, your prescriber will review treatment duration periodically, typically every 6-12 months.
Can I get aciclovir tablets without seeing a GP?
Yes. At Cured Pharmacy, you can complete a free online consultation with a UK-registered prescriber who can assess your suitability for oral aciclovir and issue a prescription if clinically appropriate, without visiting your GP.
Is aciclovir dosage different for children with cold sores?
Yes. Paediatric aciclovir dosing is weight-based and requires specific prescriber calculation. Children under 12 typically use lower doses than adults, and treatment should only be initiated following clinical assessment by a qualified healthcare professional.
How much does aciclovir cost for cold sores at Cured Pharmacy?
Aciclovir for cold sores typically costs from £12.99 for a standard course at Cured Pharmacy. Prices vary depending on the dosage strength and quantity prescribed following your free online consultation with our UK pharmacists.
Can I get aciclovir for cold sores without seeing a doctor?
Yes, you can obtain aciclovir through our online pharmacy service at Cured Pharmacy without visiting your GP. Our qualified pharmacists will complete a free consultation to ensure aciclovir is suitable and safe for your cold sore treatment.
How quickly can I get aciclovir delivered for cold sores in the UK?
Cured Pharmacy offers free next-day delivery on aciclovir orders placed before our cut-off time. We understand cold sores need fast treatment, so we also provide same-day delivery options for urgent cases across the UK.
What is the standard aciclovir dosage for cold sores in adults?
The typical aciclovir dosage for cold sores is 200mg taken five times daily for five days, or 400mg three times daily. Cured Pharmacy pharmacists will recommend the most appropriate dosage based on your symptoms and treatment history during your consultation.
Is aciclovir safe to use every time I get a cold sore?
Yes, aciclovir is safe for repeated use when cold sores recur, and some people use it as suppressive therapy for frequent outbreaks. Cured Pharmacy can provide guidance on whether regular or episodic treatment is most suitable for your individual needs.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Reviewed on: June 03, 2026

Last reviewed: 13 August 2026

Last updated on 13 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 13 August 2026

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

Current version (13 August 2026)

Edited by: The Editorial Team

Medically reviewed by:

Tarun Kumar, GPhC No. 2233073, Prescribing Pharmacist


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