Fenistil Cold Sore Cream is for the treatment of cold sores (herpes labialis): A cold sore is caused by a viral infection. The virus can remain inactive for extended periods of time, but when triggered the virus multiplies and a cold sore develops. This can occur, for example when you are run-down, when you have a cold or flu, or when you have been out in strong sunlight. The virus causes painful blistering of the lips.

Contains the antiviral active ingredient Penciclovir: Penciclovir is an antiviral medicine which stops the virus multiplying. Applying Fenistil Cold Sore Cream means your cold sore heals faster and the duration of pain will be shorter. The time your cold sore is infectious will also be shorter, although applying Fenistil Cold Sore Cream will not stop you spreading your cold sores to another person.

Use as early as possible at the first sign of a cold sore developing

• speeds up healing
• shortens the duration of pain
• shortens the time the cold sore is infectious

Adults and children over 12 years of age:

• Use as early as possible, at the first sign that a cold sore is developing
• Always wash your hands before and after applying the Fenistil cream
• Squeeze a small amount onto your finger and apply to the affected area
• Apply at approximately 2 hourly intervals throughout the day
• Approximately 8 times a day, for 4 days.

Not suitable for children under 12 years of age

You should see your doctor if symptoms persist or worsen at any time, or if your cold sore does not heal properly after 4 days of treatment.

If you forget a treatment, apply some Fenistil cream as soon as you remember, then continue as before.

Fenistil Cold Sore Cream is not harmful if accidentally swallowed and no treatment is necessary but it may cause irritation in the mouth. 

Fenistil Cold Sore Cream contains active ingredient: 

• Penciclovir (1% w/w)

Fenistil Cold Sore Cream should not be used:

• If you know you are allergic to penciclovir, famciclovir or any other ingredient in the cream
• If you have previously used Fenistil Cold Sore Cream and become unwell
• Inside your mouth, in or near your eyes, or on your genitals. It should only be applied to cold sores on the lips and surrounding skin

Please see your doctor before using Fenistil Cold Sore Cream if:

• You are unsure that your sore is a cold sore
• Your cold sore is particularly severe
• You have a condition or are receiving treatment which weakens your immune system (i.e. the way your body fights infection is reduced), for example HIV infection, a bone marrow transplant or cancer treatment.
• You are pregnant or breast feeding

Important information about some of the excipients: Fenistil Cold Sore Cream contains cetostearyl alcohol which may cause local skin reactions (e.g. contact dermatitis). Also contains propylene glycol which may cause skin irritation.

Side effects: Most people who use Fenistil Cold Sore Cream find it causes them no problems. However, mild side effects can occasionally occur in some people. Some people may get burning, stinging, or numbness when the cream is applied. The effects will usually go away quickly. Some people have also reported allergic-type reactions such as allergic dermatitis, rash, hives, itching and swelling.

If you have any of the above side effects and they are severe, or if you find you experience any other unwanted effects, stop using the cream and consult your doctor or pharmacist.

Precautions you should take when you have a cold sore:

• Remember cold sores are infectious

• Avoid kissing, especially children
• Avoid oral sex
• Use only your own towel and face cloth and do not share cutlery, cups, glasses etc.
• Avoid breaking the blisters or picking sores, as this may prolong the healing process
• Avoid touching your eyes, as the virus can cause a serious condition if it gets into the eyes

Do not give open cream to others, even if their symptoms are the same as yours.