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Fenistil Cold Sore Treatment Cream - 2g

Based on 5 reviews
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RRP  £6.66
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Olivia Appleton - Medical Content Writer
Olivia Appleton
Medical Content Writer
James O'Loan - CEO & Superintendent Pharmacist
James O'Loan
CEO & Superintendent Pharmacist

What is Fenistil Cold Sore Cream?

Fenistill Cold Sore Cream is a treatment that can help to provide relief from discomfort and pain caused by cold sores. It contains the active ingredient penciclovir which helps to treat the infection and stop the uncomfortable symptoms. The effective, cream formula is easy to apply, helps to beat infection and shorten the duration of irritating symptoms, to prevent you from itching or picking them which can spread the virus that causes cold sores. If you are looking for a quick and effective cold sore treatment, try Fenistil Cold Sore Cream.


What are cold sores?

Cold sores are small spot-like blisters that usually develop on the lips and around the mouth. They’re caused by a virus called herpes simplex and they usually clear up by themselves within a week to 10 days. For the first few days after being infected with the virus, you may not experience any symptoms straight away, but an outbreak of cold sores may occur some time later. Cold sores usually start with an uncomfortable tingling, itching or burning sensation around your mouth before small, blisters appear. Cold sores can be uncomfortable but usually clear up without too much discomfort, however the herpes virus can cause a range of different symptoms in both children and adults. 

Symptoms in children

Symptoms of cold sores in children can include:

  • Swollen and irritated gums with small, painful sores in and around the mouth - this is known as herpes simplex gingivostomatitis
  • Sore throat and swollen glands
  • Excessive production of saliva
  • High temperature
  • Dehydration
  • Feeling sick
  • Headaches

In adults

Symptoms of herpes simplex viruses are rare in adults but the symptoms are similar to those experienced by children. It is possible to experience bad breath and painful sores in and around your mouth, which can develop into ulcers with grey or yellow centres. 


How can Fenistil help to relieve cold sores?

Fenistil contains the active ingredient Penciclovir which is an antiviral medicine that can prevent the Herpes virus multiplying. The soothing cream helps to irritation caused by cold sores, to prevent you touching and itching the cold sores which can spread the virus to other parts of your mouth. The effective formula helps to speed up healing of the skin around the cold sore and shortens the duration of discomfort caused by cold sores. 


How to use this product

Always use this medicine exactly as described in the patient information leaflet or as described by your doctor or a Chemist4U has told you. Start using the product as soon as you notice the early signs of cold sores, such as tingling, redness and itching. 


Adults and children over the age of 12 years:  Apply the cream in a thin layer over the cold sore. Reapply the cream every 2 hours during the day for 4 days. Wash your hands before and after applying cream. 


If the cold sore does not improve after 4 days, seek advice from your doctor or a Chemist4U pharmacist. This product is only use for cold sores on the lips and face only. Do NOT apply this medicine to the inside of your mouth, around the eyes or the genital area. 

Prevent spreading the virus

Cold sores are incredibly infectious so it is important to prevent the virus infecting other parts of the body or other people. Follow these tips to avoid spreading the virus:

  • Avoid kissing
  • Avoid oral sex
  • Use your own towel, face cloth and avoid sharing cutlery, cups and glasses
  • Avoid breaking the blisters or picking sores
  • Avoid touching your eyes, as the virus can cause a serious condition if it gets into the eyes
  • Do NOT share this product with other people, even if they share the same symptoms


When NOT to use this product

Do NOT use this product if you are allergic to any of the ingredients (see ingredients tab for full list). This product is not recommended for children under 12 years of age. Speak to your doctor before using this product if:

  • You are unsure if the sore is actually a cold sore
  • You have a condition or are receiving treatment which weakens your immune system
  • You need to treat ulcers or blisters which appear around your eyes or genital area


Side Effects

Like all medicines, Fenistil Cold Sore Cream can cause side effects, although not everyone will experience them. The potential side effects that can be caused by Fenistil are usually mild in intensity. Common side effects that can be experienced immediately after application include:

  • Initial itching
  • Burning
  • Stinging
  • Numbness

If you experience any of the following side effects, discontinue use and seek immediate medical attention

  • Allergic dermatitis
  • Rash 
  • Raised and itchy bumps
  • Swelling of the area where the cream has been applied


Important Information

This product is a medicine; make sure to speak to your doctor or Chemist 4 U pharmacist before taking this product if you have an underlying medical problem or are taking any other medicine or complementary therapy. If your symptoms get worse or continue after taking this product, contact us or your doctor. For medical services in your area, please refer to

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or our pharmacist before taking this product. If you suffer from any allergies, ask your doctor or our pharmacist if this medicine is right for you.

Store all medicines out of sight and reach of children.

Please read the included leaflet carefully before using this product.

Please contact your GP if appropriate regarding this product.


Helpful Advice on Medication Restrictions & Addiction

For further information on our medication restrictions policy, please click here.

If you are concerned about addiction to 'over the counter' medication, we urge you to visit the below links for professional help and advice:

NHS Help & Advice on Drug Addiction

Talk To Frank - Drug Addiction Help & Support

Fenistil Cold Sore Treatment Cream - 2g Reviews

By ER,
May 20, 2020
This always helps my cold sores heal very fast or usually stops them appearing all together.
By Lingard Prendergast,
March 03, 2020
The only cold sore cream that works for me, excellent!!!
By Lin Iliffe,
January 06, 2020
So pleased you stock Fenistil, at the right price, as so hard to purchase else where!
By Gilly,
October 01, 2018
Far better than any cream I have used before. Would recommend.
August 06, 2018
Penciclovir, the only ingredient to clear an established cold sore. Cold sore's clear within 1-2 days of use. Excellent.
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