Fenistil Cold Sore Cream is proven to be effective when applied as early as possible at the first sign of a cold sore developing. Fenistil Cold Sore Cream :* Speeds up healing* Shortens the duration of pain* Shortens the time the cold sore is infectiousFenistil Cold Sore Cream is for the treatment of cold sores (herpes libialis). 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.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.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 this medicine 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 feedingImportant Information :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.Remember Cold Sores are infections :To avoid the virus infecting other parts of the body, or passing the virus to other people, it is important to :-* Avoid kissing, especially children* Avoid oral sex* Avoid breaking the blisters or picking sores, as this may prolong the healing process* Use only your own towel and face cloth and do not share cutlery, cups, glasses, etc.* 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.Does Fenistil Cold Sore Cream have side effects ?Most people who use this 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.