Aciclovir is an antiviral cream used to treat herpes simplex. Herpes simplex virus or HSV for short is a highly contagious virus that once contracted, usually before the age of 10, lies inactive within the body. HSV can then become active from time to time, usually if you are run down. HSV is very common it is believed that 7 in 10 people carry the virus but for some people it might remain inactive.
Aciclovir works by preventing the virus from multiplying and spreading so helping the immune system to fight it off. This means it will help the healing process of current sores and prevent new ones from developing. Aciclovir will not eliminate the herpes simplex virus or prevent future outbreaks of cold sores occurring. It also won’t stop you spreading the virus to others.
Before using Aciclovir cream:
Some medical conditions may interact with Aciclovir cream. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you
If you have ever had an allergic reaction to Aciclovir, valaciclovir, propylene glycol or any other ingredients of the preparation
Do NOT use Aciclovir Cream
Inside your mouth (e.g. for mouth ulcers) or nose.
For any skin infection other than a cold sore.
In the eyes or genital area.
Using Aciclovir cream:
Suitable for all ages
Apply at the first signs of a cold sore (such as tingling and itching).
Apply liberally to the affected area 5 times a day.
Continue treatment for 4 days. If your cold sore hasn’t healed after this time, you can use the cream for up to 10 days in total.
Treat your cold sore for 4 full days to ensure rapid healing.
If you forget a dose, apply when you remember and continue as before.
If your cold sore hasn’t healed fully after 10 days, or if it gets worse at any time, contact your doctor.
Never give your AQciclovir cream to others, even if their symptoms are the same as yours.
The amount of cream inside this pack is enough for one cold sore attack. For any future attacks, start treatment at the first signs of a cold sore developing (such as tingling or itching). It can also be started during the blister stage.
Do not use more than the recommended dose
Ingredients and Precautions
The active ingredient is Aciclovir. Each gram of the cream contains 5% of Aciclovir. The other ingredients are stearoyl macrogolglycerides, dimeticone, cetyl alcohol, liquid paraffin, white soft paraffin, propylene glycol and purified water
Do not touch your eyes until you have washed your hands after application.
If you accidentally get cream in your eye, wash out thoroughly with warm water. Consult your doctor if you are concerned.
Do not swallow the cream. If you accidentally swallow any cream, it is unlikely to cause any ill effects but consult your doctor if you are concerned.
Avoid touching a cold sore to prevent transferring the infection or making it worse.
If you have been told by your doctor that you have a weakened immune system, contact your doctor before treating any type of infection.
Ask your doctor or pharmacist for advice before taking any medicine.
Before use consult your doctor or pharmacist if your cold sore is very severe, you are pregnant or breastfeeding, or you know your immune system is weekened
Side effects when using
All medicines may cause side effects, but many people have no, or minor, side effects. Stop using the medicine and tell your doctor if you experience:
Allergy-like reactions, for example swelling of the lips, face and eyelids.
The following side effects could also occur:
Mild burning or stinging after application. This will quickly go away.
Redness, itching or a mild drying or flaking of the skin, skin rashes, hives or weals.
Reporting of side effects
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed here You can also report side effects directly via the Yellow Card Scheme at: