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Aciclovir Tablets vs Cream: Cold Sore Treatment Guide

Published on: June 03, 2026

Choosing between aciclovir tablets vs cream UK options depends on cold sore severity, frequency, and how quickly you need relief. At Cured Pharmacy, our UK-registered clinical team helps patients select the most appropriate aciclovir formulation, with treatments starting from £4.49 and free online consultation under three minutes.

How Aciclovir Works Against Cold Sores

Aciclovir is an antiviral medication that targets the herpes simplex virus (HSV-1), the pathogen responsible for cold sores [1]. Once inside infected cells, aciclovir is converted into its active form and inhibits viral DNA polymerase, preventing the virus from replicating and spreading to healthy tissue.

Clinical trials demonstrate that aciclovir can reduce cold sore healing time by approximately 1-2 days when treatment begins at the first sign of symptoms — typically the tingling or burning sensation before blisters appear [1][2]. The medication is available in two primary formulations in the UK: topical cream (5% concentration) and oral tablets (typically 200mg or 400mg doses).

Aciclovir Tablets vs Cream: Key Differences

The fundamental difference between aciclovir tablets and cream lies in systemic versus localised delivery. Oral tablets deliver the antiviral medication throughout your bloodstream, reaching infected cells from within, whilst topical cream works directly on the skin surface where you apply it [2].

Tablets typically contain 200mg or 400mg of aciclovir and are taken five times daily for five days, though dosing varies based on prescriber assessment. Cream contains 5% aciclovir and is applied to the affected area five times daily, ideally at the first tingling sensation [3].

Efficacy Comparison

Clinical evidence suggests oral aciclovir may offer superior efficacy for recurrent cold sores, particularly when treatment begins during the prodromal phase [2][3]. A systematic review found that oral antiviral therapy reduced healing time by an average of 0.5 to 1.5 days more than topical treatments, though individual responses vary considerably.

Topical aciclovir cream remains effective for mild, infrequent outbreaks and offers the advantage of direct application without systemic absorption. For patients experiencing frequent recurrences (six or more episodes yearly), suppressive oral therapy may be recommended by your UK prescriber [4].

When to Choose Aciclovir Tablets

Oral aciclovir tablets are typically recommended for patients with frequent cold sore outbreaks, severe symptoms, or those who need faster resolution. Because tablets work systemically, they can address viral replication throughout the body rather than just at the skin surface [3].

Your UK prescriber may recommend tablets if you experience more than six cold sore episodes per year, if outbreaks are particularly painful or extensive, or if you have a compromised immune system. Tablets require a prescription in the UK and necessitate a clinical assessment by a registered prescriber before dispensing.

Dosing and Treatment Duration

Standard oral aciclovir dosing for cold sores is 200mg five times daily for five days, though some prescribers may recommend 400mg three times daily as an alternative regimen [4]. Treatment should ideally begin within 48 hours of symptom onset for maximum efficacy.

For suppressive therapy in patients with frequent recurrences, lower daily doses (typically 400mg twice daily) may be prescribed for extended periods, subject to ongoing prescriber review and monitoring [4].

When to Choose Aciclovir Cream

Topical aciclovir cream suits patients with infrequent, mild cold sore outbreaks who prefer a non-systemic treatment option. The 5% cream formulation is available without prescription in the UK for adults and children over 12 years, making it accessible for immediate treatment [1].

Cream application should begin at the first sign of tingling or redness, applied five times daily to the affected area. Whilst cream may not reduce healing time as dramatically as oral tablets, it offers convenience, localised action, and minimal systemic absorption — important considerations for some patients [2][3].

Side Effects and Safety Considerations

Aciclovir cream is generally well-tolerated, with the most common side effects being mild stinging, burning, or dryness at the application site [1]. Systemic side effects are rare with topical use due to minimal absorption through intact skin.

Oral aciclovir tablets may cause headache, nausea, diarrhoea, or dizziness in some patients, though serious adverse effects are uncommon [4]. Adequate hydration is recommended during oral aciclovir therapy, particularly for patients with reduced kidney function. Your UK prescriber will assess your medical history and current medications to ensure aciclovir is appropriate and safe for you.

Drug Interactions and Contraindications

Aciclovir has relatively few drug interactions, though caution is advised when used alongside medications that affect kidney function, such as certain diuretics or nephrotoxic drugs [4]. Patients with severe kidney impairment may require dose adjustments for oral aciclovir.

Both formulations are considered safe during pregnancy and breastfeeding when clinically necessary, though this decision should always be made in consultation with your prescriber or GP [1][4].

Getting Aciclovir Treatment at Cured Pharmacy

At Cured Pharmacy, we offer both aciclovir formulations with transparent upfront pricing. Our Numark Cold Sore Cream containing 5% aciclovir is available from £4.49, whilst prescription aciclovir tablets start from £4.49 following clinical assessment by a UK-registered prescriber.

All prescription aciclovir requires completion of a free online consultation, typically under three minutes, reviewed by our clinical team led by Superintendent Pharmacist Tarun Kumar (GPhC 2233073). We dispense only genuine UK-licensed medicines with discreet packaging and competitive delivery options across the UK.

How to Order

For over-the-counter aciclovir cream, simply add the product to your basket and complete checkout. For prescription aciclovir tablets, you'll complete a brief medical questionnaire during checkout, which a UK prescriber reviews before approving and dispensing your treatment.

Our GPhC-registered pharmacy (9012511) operates with full regulatory compliance, ensuring every patient receives appropriate clinical oversight and pharmaceutical care. Contact our team on (+44) 116 4646009 if you have questions about which aciclovir formulation may be most suitable for your needs.

Scientific References

1. Spruance, S. L., et al. (2002). Acyclovir cream for treatment of herpes simplex labialis: results of two randomized, double-blind, vehicle-controlled, multicenter clinical trials. Antimicrobial Agents and Chemotherapy, 46(7), 2238-2243. https://doi.org/10.1128/AAC.46.7.2238-2243.2002 [accessed 13 August 2026]
2. Chi, C. C., et al. (2015). Interventions for prevention of herpes simplex labialis (cold sores on the lips). Cochrane Database of Systematic Reviews, 2015(8), CD010095. https://doi.org/10.1002/14651858.CD010095.pub2 [accessed 13 August 2026]
3. Raborn, G. W., et al. (1997). Oral acyclovir and herpes labialis: a randomized, double-blind, placebo-controlled study. Journal of the American Dental Association, 128(9), 1281-1286. https://doi.org/10.14219/jada.archive.1997.0426 [accessed 13 August 2026]
4. British National Formulary. (2024). Aciclovir. BNF Online. London: 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.