Aciclovir 400mg Tablets

Antiviral Cold Sore Treatment

Aciclovir 400mg Tablets
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Cost-effective anti-viral treatment for outbreaks of cold sores.
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Aciclovir

What is Aciclovir and how does it treat cold sores?

Aciclovir is an antiviral medication used to treat the herpes simplex virus. It stops the spreading of the herpes virus in the body by interrupting the process of virus replication, thereby reducing the duration of the infection. It is not a cure for these infections, as the virus continues to live in the body even after an outbreak but Aciclovir reduces the severity and length of the outbreak.

How do I take Aciclovir?

Aciclovir should be swallowed with water three times a day for 5 days. The treatment is most effective when you use it at the first signs of outbreak.

How effective is Aciclovir?

If Aciclovir taken as soon as a herpes outbreak has begun, Aciclovir can reduce the duration and severity of the outbreak. It can also suppress recurring outbreaks by 80%.

How fast does it work?

How quick and well Aciclovir work will depend on the severity of your symptoms and how soon you notice the symptoms before starting treatment. As soon as you start to notice the symptoms, it is best to start taking Aciclovir. You should consult with your doctor as soon as you spot an outbreak.

Do I need to seek medical advice before taking Aciclovir?

If you are pregnant, breastfeeding, elderly or suffer from kidney problems it is best to seek medical advice before taking Aciclovir.

 

Cold Sore Treatment

What are cold sores and how do you get them?

Cold sores are blisters which occur on the mouth and lips caused by the herpes simplex virus. It is caught when you come into contact with people with the infection. The virus usually remains dormant under the skin but often when your immune system weakens through stress or illness, the virus will reactivate.

Herpes - Herpes is the name given to a family of viral infectious diseases. The most common virus within this family is Herpes Simplex Virus (HSV), the cause of oral and genital herpes. Symptoms include:

  • Itching
  • Soreness
  • Tingling
  • Red bumps around the mouth and lips, which develop into painful crusty sores

What do cold sores look like?

Cold sores develop in different stages:

  1. Tingling, itching or burning sensation.
  2. Small fluid blister(s) start to form.
  3. The blister will fill with fluid and bust.
  4. The scab formed will slowly heal within the next few days.

What triggers cold sores to appear?

Common triggers include:

  • Infection (e.g. cold or flu)
  • Stress
  • High fever
  • Injury to the lip or mouth
  • Being tired/exhausted
  • Hormonal changes
  • Exposure to sunlight

Once you’ve been exposed to a cold sore, the likelihood of it recurring is higher, but looking after your health and knowing what your cold sore triggers are, you will find it easier to avoid future outbreaks.

Are cold sores contagious?

The herpes simplex virus which cause cold sores are extremely contagious from the moment you first feel the tingling sensation until the time it has healed.

Do’s/Don’ts of having a cold sore:

  • Drink plenty of fluids to avoid dehydration
  • Wash your hands before and after applying the cream
  • Use lip balm with SPF 15 or above
  • Eat cool, soft foods
  • Take painkillers to ease pain and swelling
  • Do not touch your cold sore
  • Do not kiss anyone when you have a cold sore
  • Do not share anything you come into contact with (e.g. creams, cutlery, lipstick)
  • Do not eat salty, acidic food
  • Do not have oral sex until your cold sore has completely healed

 Information Leaflet

Always read the patient information leaflet before commencing treatment.

Important: We advise you to always read the patient information leaflet inside the medication box, as the generic medication may not always entirely match the patient information leaflet listed. Please contact us if you have any questions.

Written and reviewed by our qualified team

GPhC Number: 2088658

Ana Carolina Goncalves
Authored by: Ana Carolina Goncalves Superintendent
Pharmacist

GPhC Number: 2225869

Rehma Gill
Reviewed by: Rehma Gill Pharmacy
Manager

Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 01 May 2025

Aciclovir Reviews

Overall Rating
9.8 / 10
Ratings Distribution
5 stars
993
4 stars
63
3 stars
7
2 stars
2
1 star
7

Based on 1,073 independent customer reviews taken by Feefo, Google and Trustpilot.

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"Excellent all round service"

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Excellent all round service

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Excellent all round service

Review from: Trustpilot

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Fast delivery,great service,will use again

Review from: Feefo

TickVerified Buyer

Product Review:

anti viral for cold sores

Service Review:

prompt

Review from: Feefo

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"Quick and easy"

Product Review:

Quick and easy

Service Review:

Quick and easy

Review from: Trustpilot

TickVerified Buyer

Product Review:

What a relief when this arrived. I would still be waiting if I had to make appointments at my GP. Thank you so much and I’m all better now

Review from: Feefo

TickVerified Buyer

"Excellent service"

Product Review:

Second time using this company
Very easy to use and quick delivery

Service Review:

Excellent thank you

Review from: Feefo

TickVerified Buyer

"Excellent service."

Product Review:

Great medication healed my cold sore really quick

Service Review:

Excellent service.. quick delivery would recomment

Review from: Trustpilot

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"Order with confidence"

Product Review:

Excellent service. Easy to place order.
Arrived very quickly, I will definitely be ordering again.

Service Review:

Excellent service

Review from: Feefo

TickVerified Buyer

"A genuine company."

Product Review:

These tablets have saved me from cold sores.

Service Review:

I’m impressed with the speed of delivery after placing an order and the products are good quality.

Review from: Trustpilot

TickVerified Buyer

Product Review:

Amazing speedy service!
Discreet, efficient, hassle free and easy to use - thanks!

Service Review:

Brilliant! Would highly recommend

Review from: Feefo

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Discreet service

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Your privacy is important to us. That’s why we’ve taken every step to ensure your order arrives in the most discreet way possible.

From start to finish, your purchase is handled with complete confidentiality. You’ll never see our brand name on your bank statement, bills or delivery papers.

All our parcels are sent in plain, unmarked packaging with no logos, no product descriptions and no indication of what’s inside.

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£2.90 - Wednesday 11 June

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£3.95 - Wednesday 11 June

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£5.95 - Wednesday 11 June by 1pm

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from £4.95 - Tuesday 10 June

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