Aciclovir tablets

Aciclovir tablets, an antiviral medication for treating cold sores is available from Medicinesbymailbox Pharmacy.

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Aciclovir tablets

Aciclovir tablets

Prescription fees

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

Order value Prescription fee
Any Order Value £0.00

Aciclovir product information

Aciclovir tablets contain the active ingredient aciclovir, which is a type of antiviral medicine used to treat cold sore. Cold sore is caused by a virus called Herpes Simplex Virus (HPV). Aciclovir can kill or stop the growth of this organism.

How to take

The usual dose for cold sore is to take one 200mg tablet FIVE times a day, and to take the tablets for 7 days. It is recommended to space the doses evenly throughout the day, ideally every 4 hours. You should dissolve the tablet in a glass of water and stir well before drinking. You should finish the whole course of treatment to ensure that the infection has completely cleared up.

Side effects of Aciclovir

Like all medicines, Aciclovir can cause some side effects, although not everyone gets them.

The most common side effects associated are usually mild and include vomiting, stomach pain, diarrhoea, headache and feeling dizzy. It is important that if you feel dizzy taking this medicine that you avoid driving or operating machinery.

You should also be drinking plenty of fluids while taking Aciclovir to replace any lost fluids.

However, if you experience a severe allergic reaction with symptoms such as difficulty breathing, swollen lips, eyes or face and itching or rash, you should stop taking aciclovir immediately and seek urgent medical advice.


During a consultation with Medicinesbymailbox, you will be asked to complete an online assessment questionnaire to determine your suitability for the medication. You should NOT take aciclovir without consulting a GP if you:
  • Are allergic to aciclovir or valaciclovir
  • Are over 65 years old
  • Have kidney problems
If you are pregnant or breastfeeding, you should speak to a doctor or pharmacist for advice before taking aciclovir.

Some medications can influence the way aciclovir works and vice versa, such as cimetidine, a medicine used to treat stomach ulcers. If you are unsure about your current medication, you should check with a doctor or pharmacist for advice.

Patient information leaflet

The 'Patient Information Leaflets' supplied with medication must be read before taking capsules.