If you have both aciclovir cream and aciclovir tablets, it is natural to wonder: can you use aciclovir tablets and cream together? Yes, they can be used together in some situations. However, a randomised trial found no added benefit from adding aciclovir cream to oral aciclovir for people being treated for a first episode of herpes simplex infection.
That is why this question comes up so often. People want to know whether using both forms can improve treatment or simply adds another step. This guide is for adults in the UK looking for practical information about aciclovir for cold sores, whether you are considering cream, tablets, or both. It explains how aciclovir works against the virus, the difference between tablets, cream, and ointment, what the clinical evidence says about using treatments together, how well each option may work, and the key safety and usage points to know.
How Aciclovir Works
Aciclovir is an antiviral medicine. It is a type of molecule that is similar to one of the building blocks used to make viral DNA. This allows it to interfere with the virus as it copies itself.
The first step depends on an enzyme called thymidine kinase, which is produced by herpes viruses. This helps activate aciclovir inside infected cells. Once activated, aciclovir interferes with the viral DNA polymerase enzyme and stops the virus from making more viral DNA.
Aciclovir only works on virus that is actively replicating. It does not remove the virus from the body, which is why it does not cure a herpes infection. Its effect is generally greater when treatment is started early in an outbreak, such as when tingling or itching first begins.
Aciclovir is available in different forms, including skin cream, tablets, intravenous treatment for hospital use, and eye ointment. The medicine is the same active ingredient, but each formulation is made for a different use.
Can You Use Aciclovir Tablets and Cream Together?
What the Trial Found
This has been studied directly. Fifty people with a first episode of herpes simplex infection, such as genital herpes, were randomly given either oral aciclovir with 5% aciclovir cream or oral aciclovir with a matching placebo cream for one week.
The combined treatment reduced the duration of itching in women only. It did not make a difference to the other symptoms, how quickly the lesions healed, or the recurrence rate afterwards. The researchers concluded that adding topical aciclovir did not provide an additional benefit for people already taking oral aciclovir.
Why Adding Cream May Not Add Much
Oral aciclovir is absorbed into the bloodstream and can reach infected areas throughout the body. Aciclovir cream works mainly where it is applied. Using more of the same medicine on the skin does not necessarily provide extra benefit when you are already taking tablets.
So, can you use both? They may be used together in some circumstances, but there is limited evidence that adding the cream to oral treatment provides extra benefit. If you have been prescribed tablets, follow the instructions from your doctor or prescriber rather than adding another treatment on your own.
Where Combinations Do Have Evidence Behind Them
There is evidence for some specific antiviral and anti-inflammatory combination products. These are designed as a single treatment and are different from simply using an antiviral cream alongside antiviral tablets.
Whether a combination treatment is suitable depends on the medicine involved and your individual circumstances. A doctor, pharmacist, or prescriber can advise you on the most appropriate option.
Cream, Ointment and Tablets: What the Words Actually Mean
These terms are sometimes used interchangeably online, but they can refer to different products and uses.
Cream Versus Ointment
Both cream and ointment can contain aciclovir, but their bases and formulations can be different. Some studies have found that aciclovir can penetrate the skin differently depending on the formulation.
For cold sores in the UK, 5% aciclovir cream is a commonly available formulation. Always check the product packaging and leaflet because the approved use can vary between products.
The Eye Ointment Is a Different Product Altogether
Aciclovir eye ointment is a separate product used for herpes infections of the eye. It has a different strength and formulation from skin cream.
Do not put skin cream in your eye, and do not use eye ointment as a substitute for cold sore cream. If a cold sore is affecting the eye or you have eye pain, redness, or changes in vision, seek urgent medical advice.
| Formulation | Strength | Used for |
|---|---|---|
| Aciclovir cream | 5% | Cold sores on the lips and face, depending on the product |
| Aciclovir ointment | 5% | A different formulation with uses that may vary by country and product |
| Aciclovir eye ointment | 3% | Herpes infection of the eye, under medical supervision |
| Aciclovir tablets | Various | Systemic treatment where a prescriber considers it appropriate |
| Aciclovir infusion | Hospital use | Severe or complicated infections |
Does Aciclovir Cream Actually Work? An Honest Look
Search for reviews of aciclovir for cold sores and you will find different experiences. Some people find it helpful, while others notice little difference. This also reflects the results seen in clinical studies.
Some systematic reviews suggest that 5% aciclovir cream can reduce the duration of a cold sore when treatment is started early. Other research has found a smaller or no significant difference compared with placebo cream.
For example, a double blind randomised crossover trial involving 45 people and 72 episodes of recurrent cold sores found no significant clinical benefit from 5% aciclovir cream compared with placebo cream. Median healing time was nine days with aciclovir cream, ten days with placebo cream, and thirteen days when nothing was used.
These results show why expectations matter. Aciclovir cream may help shorten a cold sore for some people, but it is not a cure and the benefit may be modest. Starting treatment early may give it the best chance of helping.
Tablets or Cream: The Practical Differences
| Aciclovir 5% cream | Aciclovir tablets | |
|---|---|---|
| Where the drug goes | Mainly where you apply it | Throughout the body, through the bloodstream |
| Systemic exposure | Low | Yes, by design |
| Typical side effects | Mild stinging, burning or dryness at the site | Headache, nausea, dizziness, diarrhoea, rash |
| Effort involved | Repeated application through the day | Swallowed doses |
| UK access | Some small packs are available from pharmacies; other packs may require a prescription | Prescription only |
| Not suitable for | Eyes, inside the mouth or nose, or areas not listed on the product packaging | Use only as directed by a prescriber |
One point worth clearing up is that not all aciclovir treatments for cold sores require a prescription. Some 5% aciclovir cold sore creams are available from pharmacies without a prescription, subject to suitability. Other formulations and larger packs may require a prescription. Aciclovir tablets are prescription medicines in the UK.
It is also worth knowing that aciclovir cream is not a protective barrier over a cold sore. It contains an antiviral medicine that works on the virus. Products such as hydrocolloid patches work differently by covering and protecting the area.
Aciclovir Cream and Genital Herpes
This is an important point because people often search for the two together. A cold sore cream should not automatically be used for genital herpes. Check the product information carefully because different aciclovir creams can have different approved uses.
Some aciclovir formulations are licensed for genital herpes, while specific cold sore creams may state that they should not be used on the genitals. Do not assume that one aciclovir cream can be substituted for another.
In the UK, genital herpes may be treated with oral antivirals after a clinical assessment. A first episode should be assessed by a healthcare professional, especially if symptoms are severe or you are unsure what is causing them. Current UK guidance recommends oral antiviral treatment for appropriate cases of genital herpes.
If you are pregnant and have genital herpes, speak to your midwife, obstetric team, or doctor. Treatment and delivery planning may depend on your individual situation.
Timing: The Variable You Actually Control
When it comes to cold sore treatment, starting early can matter.
- Tingling, itching or burning can happen before a blister appears. This early stage is often a good time to start treatment if the product instructions recommend doing so. Small fluid filled blisters may appear later.
- Once a blister has fully developed, there may be less opportunity for an antiviral cream to affect the early stages of the outbreak.
- A cold sore often takes around seven to ten days to clear. Treatment may help shorten the outbreak for some people, but it does not usually stop the infection completely.
- If you get recurrent cold sores, keeping suitable treatment available can make it easier to start treatment when symptoms begin.
- Wash your hands before and after touching the cold sore or applying cream. This can help reduce the chance of spreading the virus to other parts of your body or to other people.
Side Effects and Cautions
Aciclovir cream is generally well tolerated. Some people may experience mild burning, stinging, or irritation where the cream is applied. These effects are usually local to the treatment area.
Aciclovir tablets can also cause side effects. Reported effects include headache, nausea, dizziness, diarrhoea, and rash. If you feel dizzy or faint after taking aciclovir, avoid driving or using machinery until you feel better.
You can usually eat and drink normally while taking aciclovir. It is important to drink plenty of water while taking aciclovir tablets, particularly if you have kidney problems. Tell your doctor or pharmacist about any other medicines you are taking.
If you miss a dose, take it when you remember unless it is nearly time for your next dose. Do not take two doses at the same time to make up for a missed dose.
Do not use aciclovir if you have previously had an allergic reaction to aciclovir or valaciclovir. If you are unsure whether it is suitable for you, speak to a pharmacist or doctor.
Get medical advice if a cold sore has not started to heal within around ten days, if it is very large or painful, if your outbreaks are becoming more frequent or severe, or if you have a weakened immune system. Seek urgent medical advice if you develop eye pain, redness, or changes in vision.
Treatment Options and Costs
| Treatment | Type | From |
|---|---|---|
| Aciclovir 5% Cream | Topical antiviral | £8.99 |
| Aciclovir Tablets | Oral antiviral | £12.99 |
| Valaciclovir | Oral antiviral | £18.99 |
| Valtrex | Branded valaciclovir | £34.99 |
If you would like a prescriber to review which option may suit your outbreak pattern, you can complete an online cold sore assessment as a free online consultation through our online healthcare service. A UK registered prescriber can then review whether the treatment is appropriate for you, with discreet delivery if it is prescribed.
