Aciclovir tablets

Aciclovir antiviral tablets to treat cold sores available to buy online. Aciclovir (Zovirax) stops viruses multiplying and spreading.

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Buy aciclovir tablets online in UK

How to order aciclovir tablets online for UK delivery:

  1. Read medical information about cold sore treatment
  2. Answer medical questions to check for eligibility
  3. Reviewed by doctors - posted from UK pharmacy (tracked 24hr service)


Treatment typeQuantityCost
Aciclovir 200mg tablets25 tablets (one treatment)£8.95
Aciclovir 200mg tablets50 tablets (two treatments)£13.95
Aciclovir 400mg168 tablets (3 months suppressive treatment)£29.20
Aciclovir 400mg336 tablets (6 months suppressive treatment)£49.40

Price match guaranteePrice match guarantee
Prescription issued online - small prescription fee per order.

Prescription fees

Dr Fox supplies medicine on prescription and charges a small prescription fee based on the order value of each prescription.

Prescriptions are issued by our doctors online and sent electronically to our pharmacy.

Order valuePrescription fee
up to £10£1.00
up to £20£2.00
up to £40£3.00
over £40£4.00

If you have your own private paper prescription please post to our pharmacy (details).

Dr Fox prices are 25%–50% lower than other UK online clinics.

Delivery charges

UK delivery only: £2.90 per consultation via Royal Mail 24 Signed For (1-3 working days with tracking).

Parcel forwarding services are not permitted. Use only UK home or work delivery address.

Returns and refunds - unwanted items can be returned within 14 working days for a full refund.

About Aciclovir

  • Aciclovir is a prescription-only antiviral medicine used to treat Herpes outbreaks.
  • 5-day course of Aciclovir 200mg tablets is recommended for cold sores.
  • Aciclovir 400mg tablets may be used for suppressive treatment.
  • Read the patient leaflet for a full list of side effects, cautions, and interactions with other drugs.

Aciclovir is the medical name for the active ingredient of the tablets. Aciclovir is an antiviral medicine which stops Herpes viruses multiplying and spreading. For essential information about cold sores and their treatment read our medical information page.

Aciclovir tablets come in various strengths, 200mg, 400mg, and 800mg. A 5-day course of 200mg strength tablets is the recommended course for cold sore treatment. Various brands of tablets are available produced by different drug companies, including Boots, GSK (Zovirax brand), and Actavis. All have the same active ingredient. The shelf life of the medication is several years, which means that people who are prone to cold sores can keep a stand-by supply at home for use as needed.

If you get repeated outbreaks (more than 6 a year) you may want to consider taking treatment to try and suppress these outbreaks by taking a 400mg tablet twice daily for 6-12 months.

How to take for outbreaks

Take one 200mg tablet 5 times a day at 4 hourly intervals for 5 days, swallowed whole, with or without food. Alternatively dissolve the tablet in a glass of water and stir before drinking. Start tablets as soon as possible after the first signs of a cold sore. It is best to start at the stage when there is tingling and burning, even before the sore is visible. Tablets will still have an effect if started later, but results are best with early treatment. Continue for the full 5-day course. If a tablet is missed, take the next as soon as remembered. Do not take extra tablets to make up for missed doses. Avoid dehydration and drink plenty of water during treatment.

How to take for suppression

Take one 400mg tablet twice a day for 6-12 months, swallowed whole or dissolved in water. Remember to drink plenty of water to avoid dehydration.

When to consult a doctor

Most people who suffer from repeated cold sores are familiar with their symptoms and can safely self-treat. People who have not previously had sores on the lips or have sores that have not healed after 10 days should consult a doctor. Cold sores are often painful and are sometimes associated with mild symptoms of unwellness. They do not spread out across the face or cause fever and other symptoms of infections.

Aciclovir may not be suitable for people with a history of seizures or kidney disease. Aciclovir can interact with some prescribed medicines such as probenecid used to treat gout and cimetidine for acid indigestion, and also increase the dose received of theophylline and aminophylline sometimes used for asthma. These and other more theoretical interactions with mycophenolate, ciclosporin, and zidovudine are unlikely to be significant at the dose used to treat cold sores. You may need to discuss taking aciclovir alongside these medications with your own doctor. Checks are carried out during the online consultation.

Aciclovir tablets side effects

Not everybody gets side effects. The most common, occurring in less than 1 in 10, are dizziness, headache, irritation, rash, itching skin, tiredness, nausea and sickness, diarrhoea, stomach pain, and fever and skin reaction after exposure to light (photosensitivity). See the manufacturer's leaflet for a full list of side effects. If there is a very rare allergic type reaction with swelling of the lips, face, or eyelids, or shortness of breath with wheeze, stop taking tablets and seek immediate medical assistance.

Pregnancy and breastfeeding

The risks are unknown, therefore, do NOT take aciclovir whilst pregnant or breastfeeding without first consulting a doctor.

See BUMPS use of medicines in pregnancy factsheet - Aciclovir.

Patient Information Leaflet

Illustration of patient leaflet from medicine packet

The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine and must be read before taking the medicine. It is written for patients and gives information about taking or using a medicine.

Aciclovir 200mg Tablets Patient Leaflet
Aciclovir 400mg Tablets Patient Leaflet

Dr Tony Steele

Authored 13 August 2016 by Dr Tony Steele
MB ChB Sheffield University 1983. Former hospital doctor and GP.

Reviewed by Dr A. Wood, Dr C. Pugh, Dr B. Babor, Dr P. Hunt
Last reviewed 22 June 2021
Last updated 18 October 2021


The order process

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Product reviews

Aciclovir 200mg tablets rated 4.91/5 in 162 product reviews

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Aciclovir 200mg tablets

Great product great service.

07/05/2022 13:36
L. Phillips Verified

Aciclovir 200mg tablets

Delivered within reasonable timing. Did the job, thank you will definitely order again

29/04/2022 14:12
Anonymous Verified

Aciclovir 200mg tablets

Worked perfectly

21/04/2022 22:43
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Aciclovir 200mg tablets

Very pleased with service and product

09/04/2022 20:21
C. Stevens Verified

Aciclovir 200mg tablets

My experience could not be faulted. Items were received quickly in discreet packaging. I highly recommend this service.

07/04/2022 04:10
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