Cold sores often appear at inconvenient times, and the window in which antiviral treatment is generally most effective is short. That combination is why so many people search for an aciclovir prescription online rather than waiting for a GP appointment.
This page explains what aciclovir is, how it works, who it may be suitable for, what it costs, and how the online prescription process works at EverydayMeds. It also covers the questions people most often ask before ordering, including whether you can buy aciclovir tablets without a prescription in the UK and how tablets compare with cream.
Medical disclaimer: This page is general health information and does not replace personalised medical advice. Aciclovir is a prescription medicine that should only be used under the supervision of an appropriately qualified prescriber. Treatment suitability depends on an individual clinical assessment. Results vary between individuals.
What Is Aciclovir?
Aciclovir is an antiviral medicine used to treat infections including cold sores, shingles, chickenpox, genital herpes and herpes simplex eye infections. Aciclovir is used in both adults and children where clinically appropriate. Most types are prescription-only, though some types can be bought from shops and pharmacies. It is also sometimes used to prevent these infections in people with a weakened immune system and is one of several antiviral treatments used for this purpose.
Aciclovir comes in several forms, including tablets, cream and eye ointment, with tablets commonly supplied in 200mg and 400mg strengths. The brand name most people recognise is Zovirax, and Virasorb is another brand name in the UK.
Aciclovir or Acyclovir? Which Spelling Is Correct?
Both refer to the same medicine. Aciclovir is the international non-proprietary name used in the UK and across Europe. Acyclovir is the United States adopted name. If you have searched for an "acyclovir online prescription" or "acyclovir prescription online", you are looking for exactly the same active ingredient that UK pharmacies dispense as aciclovir. There is no difference in the drug itself.
How Aciclovir Works
Cold sores are caused by the herpes simplex virus, usually type 1 (HSV-1). Once you have been infected, the virus stays inactive in nerve tissue and can become active from time to time, often triggered by illness, stress, fatigue, sunlight or hormonal changes.
Aciclovir does not eliminate the virus from the body. It works by blocking the virus from making copies of itself (DNA replication), which reduces the severity and duration of an outbreak. Treatment started early in an outbreak tends to be more useful than treatment started once blisters are well established. There is no permanent cure, so treatment helps manage a herpes infection rather than eradicate it. This is why treatment is most effective when started as soon as you notice tingling or itching.
How Common Is the Virus Behind Cold Sores?
Cold sores are extremely common, and having them is not a reflection of hygiene or lifestyle. The World Health Organization estimates that 3.8 billion people under age 50, around 64% of the global population, have HSV-1 infection, the main cause of oral herpes. Most HSV infections are asymptomatic or unrecognised.
Do You Need a Prescription for Aciclovir in the UK?
This is the single most common question, and the answer depends on which form you need.
| Product | Prescription needed in the UK? | Typical use |
|---|---|---|
| Aciclovir 5% cream (cold sores) | Some brands are available over the counter, others by prescription. | Topical treatment applied to the lip or face. |
| Aciclovir tablets | Yes, prescription-only. | Systemic treatment for cold sores, shingles, chickenpox, genital herpes. |
| Valaciclovir tablets | Yes, prescription-only. | Alternative antiviral with a different dosing schedule. |
| Valtrex (branded valaciclovir) | Yes, prescription-only. | Branded version of valaciclovir. |
Aciclovir cream is available on prescription and some brands can also be bought without a prescription from a pharmacy to treat cold sores. Oral aciclovir tablets are prescription-only in the UK, because a healthcare professional needs to assess whether they are appropriate for you, including your symptoms, medical history, kidney function, and any other medicines you take.
A UK-regulated online pharmacy service can carry out a clinical assessment remotely through an online assessment, which is how most people now obtain an aciclovir prescription online.
How to Get an Aciclovir Prescription Online with EverydayMeds
The online consultation can usually be completed on a phone in a few minutes.
Step 1. Complete the online consultation. You answer a short online consultation form about your symptoms, how long they have been present, your medical history, any other medicines you take, and whether you are pregnant or breastfeeding. This online assessment is used to check treatment suitability, so it's important to answer the questions accurately.
Step 2. Clinical review by a UK prescriber. A UK-registered prescriber reviews your answers and decides whether an antiviral is clinically appropriate for you. They may come back with a follow-up question if something needs clarifying.
Step 3. Dispensing. If treatment is approved, your prescription is passed to the pharmacy team for dispensing and dispatching. Every order includes the patient information leaflet for the medicine supplied.
Step 4. Discreet delivery. Orders are packaged in plain, unbranded packaging and sent by a tracked courier. Delivery times depend on when your consultation is approved and the courier service selected.
What Happens If Treatment Is Not Approved?
Not every consultation results in a prescription, and that is a feature of the process rather than a fault in it. If a prescriber decides aciclovir is not suitable, they will explain why and, where appropriate, suggest what to do instead, which may include seeing your GP or attending a sexual health clinic. If treatment is not approved, you will not be charged for medication that is not supplied.
Aciclovir Prices and What Is Included
| Treatment | Price from |
|---|---|
| Aciclovir 5% cream | £8.99 |
| Aciclovir tablets | £12.99 |
| Valaciclovir tablets | £18.99 |
| Valtrex (branded) | £34.99 |
Prices shown are starting prices and vary by strength and quantity, including aciclovir 400mg where prescribed. Please check the current price at checkout.
What the Price Covers
- The medicine itself, in the strength and quantity your prescriber approves.
- The clinical review of your consultation by a UK-registered prescriber.
- Dispensing by the pharmacy and the patient information leaflet.
Questions Worth Asking Any Online Pharmacy Before You Order
- Is the pharmacy registered with the General Pharmaceutical Council, and is the registration number displayed?
- Is a named, registered prescriber reviewing the consultation, or is it approved automatically?
- Is the full cost, including delivery, shown before you enter payment details?
- What happens to your money if the prescriber declines treatment?
- Is the medicine licensed by the MHRA for use in the UK?
If a site cannot answer those five questions clearly, that is worth noticing.
Aciclovir Tablets vs Cream vs Valaciclovir
| Aciclovir cream | Aciclovir tablets | Valaciclovir | |
|---|---|---|---|
| How it is used | Applied to the affected area | Taken by mouth | Taken by mouth |
| Where it acts | Locally on the lip or skin | Throughout the body | |
| Prescription status | Some brands available OTC | Prescription only | |
| Typical situation | Mild, infrequent outbreaks | More severe or frequent outbreaks | When a different dosing schedule suits better |
| Starting price | £8.99 | £12.99 | £18.99 |
Valaciclovir is converted into aciclovir in the body, which is why it can generally be taken less frequently than aciclovir tablets. Dosing schedules also vary by condition and cold sore treatment plan, so people prescribed tablets for cold sores may be told to take aciclovir 200mg five times daily, while alternatives may use a different schedule. Whether that difference is important depends on your individual clinical assessment. Your prescriber will determine the appropriate treatment based on your assessment. No single option is inherently better than the others.
Online Prescription vs GP Appointment
| Online pharmacy service | NHS GP | |
|---|---|---|
| Access speed | Consultation completed at any time, reviewed by a prescriber. | Depends on appointment availability. |
| Cost | You pay for the medicine and the service. | NHS prescription charge, or free if exempt. |
| Best for | Recognised, recurring cold sores where you have previously been diagnosed. | First episodes, unclear diagnosis, complications, immunosuppression. |
An online service is a convenience route, not a replacement for medical care. If you have never had a cold sore before, if the sore is unusually severe, if it is near your eye, or if you have a weakened immune system, see a doctor rather than self-treating online.
Timing: Why Starting Early Matters
Cold sores follow a predictable pattern. Many people notice a prodrome first, a tingling, itching or burning feeling at the site, before anything is visible. Blisters then form, break, crust and heal.
Antiviral treatment works by suppressing viral replication, so it has most to offer while the virus is actively multiplying, which is early in that cycle. If you get recurrent cold sores, having treatment available at home so you can start at the first tingle is more useful than ordering after blisters appear.
Starting late does not make treatment pointless, but it does reduce what it can realistically achieve.
Safety, Side Effects and Who Should Take Care
Common Side Effects
Common side effects of aciclovir tablets include headache, feeling dizzy or faint particularly after standing up, nausea or vomiting, diarrhoea, stomach ache, rash, increased sensitivity of the skin to sunlight, itching, tiredness and a high temperature. Side effects are less likely with the cream or ointment, though some people get mild burning or stinging that usually passes quickly. Not everyone gets side effects.
If you feel dizzy after taking aciclovir tablets, do not drive, ride a bike or use machinery until the symptoms have gone. If side effects are troublesome or unexpected, speak to a pharmacist, doctor, or the prescribing doctor.
Serious Side Effects
Aciclovir tablets can sometimes cause serious side effects, although most are rare. These include allergic reaction (anaphylaxis) causing a swollen throat or tongue, a raised itchy rash and difficulty breathing; liver problems causing tiredness, itchy skin and jaundice; kidney problems causing reduced urine output; and changes to blood cells causing tiredness, easy bruising and frequent illness. Seek urgent medical advice if you develop symptoms of a serious side effect. If symptoms are severe or life-threatening, call 999.
Medicines That May Interact
Certain medicines may not mix well with some types of aciclovir tablets, including probenecid (used for gout), cimetidine (used for stomach ulcers) and mycophenolate mofetil (taken after an organ transplant). Tell your prescriber about every medicine you take, including anything bought over the counter and any herbal remedies.
Pregnancy, Breastfeeding and Kidney Function
Aciclovir may be suitable during pregnancy if recommended by a healthcare professional, but check with a pharmacist or doctor first. Tell your doctor if you are breastfeeding before taking aciclovir tablets.
It's important to stay well hydrated while taking oral aciclovir while taking aciclovir tablets, and this is particularly important if you have kidney problems.
Who May Not Be Suitable
Most adults can use aciclovir, but it is not suitable for everyone. You may not be able to use it if you have had an allergic reaction to aciclovir or to valaciclovir in the past. Tell your prescriber about any medical conditions before treatment.
Speak to a doctor rather than ordering online if you have a weakened immune system, if the cold sore is near your eye, if it is not healing, or if outbreaks are becoming more frequent or severe.
Recurrent Cold Sores and Suppressive Treatment
Some people experience outbreaks often enough that treating each one individually stops feeling practical. In those cases a prescriber may discuss ongoing suppressive antiviral treatment, taken regularly to reduce how often outbreaks occur rather than to treat one episode. For genital herpes, suppression treatment may be used to reduce recurring outbreaks and make future outbreaks less frequent.
This is a clinical decision that requires proper assessment, and it is generally reserved for people with frequent, severe or persistent recurrences. Where clinically appropriate, aciclovir 400mg tablets may be prescribed for long-term control, and for the usual suppressive regimen may be aciclovir 400mg twice daily, depending on the clinical indication, which has been shown to reduce the frequency of genital herpes recurrences in appropriate patients. It is not something to start on your own initiative. If your outbreak pattern is changing, that itself is worth discussing with a clinician.
Storage and Practical Points
- Store tablets and cream at room temperature, away from direct heat and sunlight, in the original packaging.
- Aciclovir does not require refrigerated or temperature-controlled delivery.
- Keep out of reach of children.
- Do not use past the expiry date.
- Do not use the cream inside your mouth or nose, in or near your eyes, or inside your vagina.
- Wash your hands before and after using the cream.
To reduce passing the virus on during an outbreak, avoid kissing and oral sex until the sore has fully healed, do not share towels, lip products or cutlery, and avoid touching the sore then touching your eyes.
Key Takeaways
- Aciclovir and acyclovir are the same medicine, spelled differently in the UK and the US.
- Aciclovir tablets are prescription-only in the UK, while some cold sore creams can be bought over the counter.
- Aciclovir helps prevent the virus from multiplying rather than curing the infection.
- Treatment is most useful when started at the earliest tingling stage.
- An online consultation reviewed by a UK-registered prescriber is an established route to a prescription, but not a substitute for medical care in complex cases.
- Prices at EverydayMeds start from £8.99 for cream and £12.99 for tablets.
