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Get BNF Aciclovir Prescription Online

Published on: June 03, 2026

Need to buy aciclovir online UK prescription quickly? Cured Pharmacy offers genuine UK-licensed aciclovir treatments from £4.49, with free clinical consultations completed in under 3 minutes by our UK-registered prescribers. Whether you need topical cream or oral tablets, our GPhC-registered service delivers discreet treatment to your door.

How Aciclovir Works Against Cold Sores

Aciclovir is an antiviral medication that specifically targets the herpes simplex virus (HSV-1), the primary cause of cold sores in the UK [1]. Once absorbed into infected cells, aciclovir is converted into its active form and works by inhibiting viral DNA polymerase, effectively stopping the virus from replicating [1].

Clinical trials demonstrate that when applied at the first tingling sensation (prodrome stage), topical aciclovir 5% cream can reduce healing time by an average of 0.5 to 1 day compared to placebo [2]. Oral aciclovir tablets, typically prescribed at 200mg five times daily or 400mg three times daily, may reduce outbreak duration by 1-2 days when started within 48 hours of symptom onset [3].

The medication works best when treatment begins early. Our superintendent pharmacist Tarun Kumar notes that patients who keep aciclovir readily available and apply it at the first sign of tingling consistently report better outcomes than those who delay treatment until blisters fully develop.

Aciclovir Cream vs Tablets: Which Treatment Is Right for You?

The choice between topical aciclovir cream and oral tablets depends on outbreak frequency, severity, and your individual medical history. Both formulations are licensed by the MHRA for cold sore treatment, but they suit different clinical scenarios.

Topical aciclovir 5% cream is applied directly to the affected area five times daily for 5 days. It's particularly suitable for patients who experience infrequent outbreaks (fewer than 6 per year) and prefer localised treatment [2]. The cream formulation minimises systemic absorption whilst delivering concentrated antiviral action at the site of infection.

Oral aciclovir tablets offer systemic treatment and are typically recommended for patients with frequent or severe outbreaks, those with compromised immune systems, or when cold sores affect large areas [3]. Suppressive therapy with daily oral aciclovir may be considered for patients experiencing 6 or more outbreaks annually, subject to prescriber assessment.

Choosing Your Treatment Path

During your free online consultation at Cured Pharmacy, our UK prescribers assess your outbreak history, symptom severity, and medical background to recommend the most appropriate aciclovir formulation. Factors including pregnancy status, kidney function, and concurrent medications all influence prescribing decisions under current NICE guidance.

Buy Aciclovir Online UK Prescription: The Cured Pharmacy Process

Our streamlined online consultation takes under 3 minutes to complete. You'll answer clinically relevant questions about your symptoms, medical history, and current medications. This information is reviewed by a UK-registered prescriber who determines whether aciclovir is safe and appropriate for you.

If approved, your prescription is issued electronically and sent directly to our GPhC-registered pharmacy (registration number 9012511). We dispense only genuine UK-licensed medicines, with most orders dispatched the same working day in 100% discreet packaging. Transparent pricing is displayed upfront — you'll see the exact cost before completing your consultation, with no hidden fees.

All prescription medications require clinical assessment by a UK prescriber. Our service cannot guarantee prescription approval, as this depends on your individual medical suitability. If aciclovir is not appropriate for you, our prescriber will explain why and may suggest alternative approaches.

What to Expect During Your Consultation

You'll be asked about previous cold sore episodes, current symptoms, any known allergies to aciclovir or similar antivirals, kidney function concerns, and whether you're pregnant or breastfeeding. Our prescribers follow BNF guidelines strictly and may request additional information if needed to ensure safe prescribing.

Aciclovir Dosing and Application Guidelines

For topical aciclovir 5% cream, the standard regimen involves applying a thin layer to the affected area and surrounding skin five times daily (approximately every 4 hours, omitting the night-time dose) for 5 days [2]. Treatment should ideally begin at the first sign of tingling or redness, before blisters appear.

Oral aciclovir for cold sores is typically prescribed as 200mg five times daily for 5 days, or alternatively 400mg three times daily for 5 days [3]. Some prescribers may recommend higher doses for severe outbreaks or immunocompromised patients. Always follow your prescriber's specific instructions, as dosing may be adjusted based on kidney function.

For suppressive therapy in patients with frequent recurrences, oral aciclovir 400mg twice daily is the standard regimen, though this requires ongoing prescriber review every 6-12 months [3]. Never adjust your dose without consulting a healthcare professional, as inadequate dosing may reduce treatment effectiveness.

Common Side Effects and Safety Considerations

Topical aciclovir cream is generally well-tolerated, with the most common side effects being mild skin reactions at the application site, including transient stinging, burning, or dryness in approximately 1-5% of users [2]. These effects typically resolve without intervention.

Oral aciclovir may cause headache, nausea, or diarrhoea in some patients [3]. Rarely, patients with impaired kidney function may experience neurological side effects if doses are not appropriately adjusted. This is why prescribers ask about kidney problems during consultation.

Seek immediate medical attention if you experience signs of an allergic reaction (difficulty breathing, facial swelling, severe rash) or unusual symptoms such as confusion, tremors, or seizures. Aciclovir is considered safe during pregnancy when clinically necessary, but always inform your prescriber if you're pregnant, planning pregnancy, or breastfeeding [4].

Drug Interactions to Discuss

Aciclovir has relatively few significant drug interactions, but it's important to mention all medications during your consultation. Concurrent use with other nephrotoxic drugs (those affecting kidney function) may require dose adjustment. Probenecid can increase aciclovir blood levels, whilst mycophenolate mofetil levels may be affected by oral aciclovir [3].

Preventing Cold Sore Outbreaks: Clinical Evidence

Whilst aciclovir treats active outbreaks effectively, understanding triggers can help reduce recurrence frequency. Common triggers identified in clinical studies include UV exposure, stress, illness, hormonal changes, and local trauma to the lips [1]. Using high-SPF lip balm and managing stress may help some patients reduce outbreak frequency.

For patients experiencing 6 or more outbreaks annually, suppressive therapy with daily oral aciclovir has been shown to reduce recurrence rates by 70-80% in clinical trials [3]. However, this approach requires ongoing prescriber supervision and regular review to assess continued need and monitor for any adverse effects.

The herpes simplex virus remains dormant in nerve cells between outbreaks, which is why cold sores recur in the same location. Aciclovir does not eliminate the virus from the body but effectively manages symptoms during active episodes. Maintaining general health, adequate sleep, and good nutrition may support immune function and potentially reduce outbreak frequency, though individual responses vary considerably.

Scientific References

1. Worrall, G. (2009). Herpes labialis. BMJ Clinical Evidence, 2009, 1704. [accessed 13 August 2026]
2. Spruance, S. L., et al. (2002). 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, 185(9), 1211-1218. https://doi.org/10.1086/340041 [accessed 13 August 2026]
3. British National Formulary (BNF). (2024). Aciclovir. NICE/BNF Publications. [accessed 13 August 2026]
4. 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 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.