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: 25 Jul 2025

Aciclovir Reviews

Overall Rating
9.8 / 10
Ratings Distribution
5 stars
1,049
4 stars
63
3 stars
8
2 stars
2
1 star
7

Based on 1,129 independent customer reviews taken by Feefo, Google and Trustpilot.

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Feefo logo
"Great company"

Product Review:

Great communication, easy transaction, prescription arrived quickly & was easy to track

Service Review:

Brilliant

Review from: Feefo

TickVerified Buyer

"Efficient process"

Product Review:

Straightforward ordering process and very efficient delivery of my order. Impressed with the service offered.

Service Review:

Very efficient and quick service.

Review from: Feefo

TickVerified Buyer

"Easy to navigate website"

Product Review:

Bought for my Son. And he has said, the best money he has spent. Fantastic product 👌

Service Review:

Easy to navigate website, great product at reasonable prices!.. and very quick delivery.

Review from: Trustpilot

TickVerified Buyer

"Arrived quickly and in good condition"

Product Review:

Has helped with cold sores

Service Review:

Arrived quickly and in good condition. I highly recommend.

Review from: Trustpilot

TickVerified Buyer

"Swift and easy ordering process"

Product Review:

Effective to reduce severity or even prevent coldsore outbreak

Service Review:

Swift and easy ordering process. Product just as expected. Thank you

Review from: Trustpilot

TickVerified Buyer

"Excellent customer service"

Product Review:

Excellent did the job.

Service Review:

Excellent customer service

Review from: Trustpilot

TickVerified Buyer

"Super Efficient"

Product Review:

Always try and keep these to hand incase I feel a tingle so I can nip any potential flare ups in the bud. Especially useful for any big occasions coming up where last thing you need is an unattractive outbreak!

Service Review:

Quick to order and quick delivery... Just what I needed so thank you!

Review from: Trustpilot

TickVerified Buyer

"Easy & efficient service"

Product Review:

Very effective product. Just a little expensive.

Service Review:

Easy & efficient service. Thank you

Review from: Trustpilot

TickVerified Buyer

Product Review:

Excellent service every time I have ordered

Review from: Feefo

TickVerified Buyer

Product Review:

Amazing product, don't suffer half as much with Coldstream as I have done in the past, definitely takes the pain away

Review from: Feefo

TickVerified Buyer

Discreet service

Discreet Packaging

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.

Estimated delivery

Signed For 1st Class

£2.90 - Tuesday 30 September

Collect Near You

£3.95 - Tuesday 30 September

Special Delivery 1pm Guaranteed

£5.95 - Tuesday 30 September by 1pm

Special Delivery 9am Guaranteed

£13.95 - Tuesday 30 September by 9am

Same Day Delivery

from £4.95 - Monday 29 September

How does it work?

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