Treatment options

Buy ZOVIRAX safely, securely and easily in a few simple steps. Start a consultation today to check your eligibility with a prescribing clinician, at no cost to you.

Includes Free Private Prescription & Consultation

This content is intended for UK audiences only

82 people rated this product 5 stars
Please select form
Please select pack size
Manufacturer icon
Manufactured by GSK


Only £ per Pack

Dispensed in the UK
Registered Pharmacy Logo
Delivered securely by Royal Mail
Royal Mail Logo
Navin Khosla NowPatientGreen tick
Updated on 26 Mar 2024

What to do if you missed your ZOVIRAX dose

Report suspected side effects or adverse reactions to the Medicines and Healthcare Products Regulatory Agency (MHRA) using the Yellow Card Reporting system that covers medicines, vaccines, e-cigarettes and medical device incidents.

Learn more about reporting side effects

Other known brand names


About Zovirax

Zovirax contains aciclovir, an antiviral, as its active ingredient. It is used for the treatment of cold sores (herpes labialis) and genital herpes (herpes simplex strain 2, HSV-2), which are both herpes viruses.

Aciclovir is also used to treat varicella zoster virus (VZV, herpes zoster), which causes chickenpox and shingles and is also used in immunocompromised patients to prevent infections such as cytomegalovirus (CMV) in those who have had an organ transplant.

Aciclovir’s mechanism of action is to block certain enzymes in the virus, preventing virus replication. This allows your immune system to control the infection.

NowPatient offers Zovirax and generic aciclovir for the treatment of Herpes Simplex virus, genital herpes, and shingles, following an online consultation with a prescribing clinician.

Key facts of Zovirax

  • Zovirax is an antiviral treatment used for genital herpes, cold sores, and shingles (herpes zoster) in adults
  • Zovirax has some common side effects which include skin reactions, nausea and vomiting
  • It can be dangerous if you take Zovirax with certain medications. If you’re not sure if it is safe, discuss this with the prescribing clinician

Who is Zovirax suitable for?

Zovirax is suitable for adults between 18 and 65 years of age.

Who is Zovirax not suitable for?

Zovirax may not be suitable for some people. To make sure it’s safe for you, speak to the prescribing clinician before using Zovirax if you:

  • Have had an allergic reaction to the active ingredient aciclovir in the past or any of the other inactive ingredients such as dimeticone, liquid paraffin, propylene glycol, poloxamer 407, purified water, or sodium laurilsulfate
  • Have kidney disease
  • Have liver problems
  • Are over 65 years of age
  • Have a weak immune system

How and where to get Zovirax?

Zovirax tablets are available with a prescription only. They are not available over the counter at a pharmacy. It is however available as Zovirax cold sore cream over the counter.

NowPatient does not allow customers to buy Zovirax tablets directly. Our service is certified, safe and effective, and we only ever treat conditions. If you book a consultation with a prescribing clinician for the treatment of Herpes Simplex virus, genital herpes, or shingles, you can discuss if Zovirax is a suitable treatment option for you.

At the end of the consultation, the clinician will decide if a treatment plan is suitable for you. If it is, the clinician will issue you with a prescription which can then be ordered, paid for and delivered directly to your chosen address by NowPatient.

Dosage and strength for Zovirax for Herpes Simplex virus, genital herpes, and shingles

Zovirax is available as a Zovirax tablets, Zovirax cream, suspension, or powder for infusion. When used for Herpes Simplex virus, genital herpes, or shingles, it is available in tablets ranging from 200 to 800 mg tablets.

Information about how to take Zovirax for Herpes Simplex virus, genital herpes, and shingles

Your dose of Zovirax will depend on the condition you are being treated for:

  • Herpes Simplex virus – 200mg, five times a day for 5 days at approximately four hourly intervals
  • Genital herpes – 200mg, five times a day or 400mg three times a day for 5 days or longer if new lesion appear or healing incomplete
  • Shingles – 800mg five times a day for 7 days at 4 hourly intervals

If you forget to take a dose, take it as soon as you can. If it is almost time for your next dose, skip the missed dose and take your next dose at your usual time. You should always complete the course of treatment as prescribed by your healthcare provider and read the patient information leaflet provided with your medication for further drug information.

What happens if you take too much Zovirax?

If you take more than prescribed, then it can lead to some unpleasant side effects. You should talk to your doctor or reach out to one of our prescribing clinicians, if you have taken too much aciclovir and you experience any of the following side effects:

What are the side effects of Zovirax?

Very common side effects include:

  • Headache
  • Nausea
  • Dizziness
  • Vomiting
  • Constipation
  • Diarrhoea
  • Abdominal pain
  • Lower back pain
  • Photosensitivity
  • Skin rash
  • Itching

If you experience any serious side effects, you should contact NHS 111.

If you experience a serious allergic reaction such as anaphylaxis with the signs shown below you should contact emergency services on 999.

  • Your lips, mouth, throat or tongue suddenly become swollen
  • You’re breathing very fast or struggling to breathe (you may become very wheezy or feel like you’re choking or gasping for air)
  • Your throat feels tight or you’re struggling to swallow
  • Your skin, tongue or lips turn blue, grey or pale (if you have black or brown skin, this may be easier to see on the palms of your hands or soles of your feet)
  • You suddenly become very confused, drowsy or dizzy
  • Someone faints and cannot be woken up

Information about taking Zovirax at the same time as other medications or herbal supplements

There is not enough evidence to suggest there are any drug interactions between herbal supplements and Zovirax. In any event, you should let your prescribing clinician know if you are taking any herbal supplements.

Also, speak to your doctor if you are taking certain prescription drugs, in case of drug interactions:

  • Aminoglycosides
  • Methotrexate
  • Cyclosporin
  • Tacrolimus
  • Cimetidine
  • Probenecid

Can Zovirax taken for Herpes Simplex virus, genital herpes, shingles be taken long term?

Courses of treatment of Zovirax range from 5 to 7 days. If your condition has not improved within this time, speak to your doctor for medical advice.

Is there a herbal Zovirax?

No. Herbal Zovirax does not exist. If you have been marketed such a formulation, it may be fake.

Can women use Zovirax?

Women can take Zovirax for the treatment of Herpes Simplex virus, genital herpes, or shingles. However, Zovirax is not recommended during pregnancy or if you are breastfeeding as acyclovir may pass into breast milk. Checking with your doctor before taking Zovirax.

Should I avoid any particular food or drink when taking Zovirax?

You can eat and drink normally when taking Zovirax for the treatment of Herpes Simplex virus, genital herpes, or shingles.

What lifestyle changes can I make to help me with Herpes Simplex virus, genital herpes, or shingles?

Condoms can reduce the risk of getting genital herpes if used correctly, but be aware, a condom will only protect the area of the body it covers. You should also avoid sex while you have outbreaks of sores or blisters.

Shingles develops when the varicella-zoster virus, which originally caused chickenpox, is reactivated in your body, after you have already had chickenpox. There are vaccines such as Shingrix that are now available. Speak to your doctor for advice if you are considering the Shingrix vaccine.

Alternatives to Zovirax

Alternatives for the treatment of Herpes Simplex virus, genital herpes, or shingles include other antiviral drugs such as Valtrex, valacyclovir, Famvir, or famciclovir.


Medical Disclaimer

NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information on this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.

The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.

Faq icon

About Telehealth

Now Patient Data Security

Data Security

Our Commitment to You.

Find out moreNow Patient Data SecurityNow Patient Data Security

What is NowPatient

Online Pharmacy & Telehealth

NowPatient is an online pharmacy & telehealth service that is available in the US and UK. Our service is FREE and packed with useful features that can help you save money on the cost of your medications, access virtual treatments, and provide tools that can help improve your overall health.  Get started today and benefit from medication reminders, private treatment plans, NHS online pharmacy, GP appointment booking, Rx savings card, Drug Coupons, US drug savings programs, health conditions information, Drug Information, genetic testing, home test kits, BMI Risks, Type 2 Diabetes Riskspollen meter, air quality monitor, and lots more!

A laptop screen displays a dashboard with various health metrics and notifications. Widgets include drug coupons, home health testing, genetic risk, diabetes risk, BMI, pollen meter, and air quality.


To improve the lives of everyone by making high-quality care accessible and convenient

We are here to improve lives. Our service gives you access to smart features and resources that can help empower you to take control of your health and improve your health outcomes. All this, in one place, for FREE. We strive to bring a fresh perspective to managing health. NowPatient can be accessed by downloading the App or using your web browser.

Download our app today

A collage showing a map with pharmacies, a questionnaire, medication details, and a person video chatting on a screen.

Can I trust NowPatient

Meet our medical team

We are a passionate group of clinicians and medical writers covering a broad range of specialities with experience operating in health systems in the United Kingdom & United States. Providing excellent care and advice is at the heart of everything we do. You can read more about our medical team by visiting the medical team page or learn more about how we curate content by visiting our editorial process

Your Questions Answered

For your peace of mind, we can answer your questions quickly

We have a comprehensive list of FAQ’s on each feature page. Alternatively, for broader questions around our service just click the button below.
Find your answers