A cream that helps the immune system clear warts and sun-damaged skin
Imiquimod
A skin cream that prompts the body's own immune system to clear genital warts, sun-damaged skin patches and some superficial skin cancers.
What is Imiquimod?
Imiquimod is a cream applied to the skin that works by switching on the body's local immune response to clear abnormal cells. It is used to treat external genital and anal warts, sun-damaged skin patches called actinic keratosis, and certain superficial skin cancers such as some basal cell carcinomas. Because it stirs up an immune reaction, it deliberately causes redness, soreness, scabbing and sometimes flu-like feelings where it is used; this is expected rather than a sign something is wrong. It can also weaken condoms and diaphragms made of latex.
Education and reference only. This is a plain-language guide to Imiquimod — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Imiquimod is a topical cream that belongs to a group of medicines known as immune-response modifiers. Rather than acting directly on the abnormal cells, it encourages the skin's own immune system to recognise and destroy them. It is used for several skin problems: external genital and anal warts caused by a virus, rough scaly patches of sun-damaged skin called actinic keratosis, and some superficial skin cancers such as certain basal cell carcinomas. It is applied to the affected skin on a schedule set by the prescriber and then washed off after the recommended time.
How it works
Imiquimod activates immune cells in the skin and prompts them to release natural chemicals that fight viruses and abnormal cells. In genital warts, this immune attack helps clear the wart-causing virus; in sun-damaged skin and superficial skin cancers, it helps the body recognise and remove the abnormal cells. Because the medicine works by stirring up inflammation, the treated skin usually becomes red, sore and crusted during the course, which reflects the immune response doing its job. The skin then heals as treatment is completed.
Company & origin
Originated / developed by: Generic and branded manufacturers.
A skin cream used in the UK to treat genital and anal warts, sun-damaged skin (actinic keratosis) and certain superficial skin cancers.
Practical use
How to take Imiquimod
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Apply a thin layer to the affected skin only, on the days and at the times your prescriber tells you, usually rubbing it in gently.
- Wash your hands before and after applying it, and avoid the eyes, lips, nostrils and inside the mouth.
- Leave it on for the recommended time, then wash the area with mild soap and water.
- Expect redness, soreness and scabbing where it is used; tell your prescriber if the reaction becomes very severe.
- Do not rely on latex condoms or diaphragms while the cream is in contact with them, as it can weaken them.
Weighing it up
Advantages & disadvantages of Imiquimod
Advantages
- Treats genital warts, sun-damaged skin and some superficial skin cancers without surgery.
- Works by harnessing the body's own immune system to clear abnormal cells.
- Can be applied at home on a schedule set by the prescriber.
Disadvantages
- Deliberately causes redness, soreness and scabbing where it is used, which can be uncomfortable.
- Can cause flu-like effects such as tiredness, aches or mild fever.
- Weakens latex condoms and diaphragms, so they cannot be relied on while the cream is present.
Practical use
Good to know
The most important thing to expect with imiquimod is a strong local skin reaction: redness, swelling, soreness, flaking, scabbing and sometimes small open areas where the cream is used. This is the medicine working and is part of how it clears the abnormal cells, though if the reaction becomes very severe a break may be advised. Some people also get flu-like effects such as tiredness, aches or a mild fever. It is applied at the times your prescriber sets, often left on overnight and then washed off, with hands washed before and after. A practical safety point is that imiquimod can weaken latex condoms and diaphragms, so these cannot be relied on for contraception or protection while the cream is in contact with them. Avoid getting it in the eyes, nostrils, mouth or other delicate areas.
Who should not take it / use with caution
- People who have had a serious allergic reaction to imiquimod should not use it.
- It should not be used on broken, infected or unhealed skin unless a prescriber advises.
- It is used with care in pregnancy and breastfeeding, only when a prescriber considers it suitable.
Monitoring
- Reviewing how the warts, sun-damaged skin or skin lesions respond to treatment.
- Watching the strength of the local skin reaction and pausing treatment if it becomes very severe.
- Arranging follow-up skin checks where it is used for skin cancers or persistent lesions.
Side effects
- Redness, soreness, swelling, flaking, scabbing or small open areas where the cream is applied.
- Flu-like effects such as tiredness, headache, muscle aches or a mild fever.
- Less commonly, longer-lasting changes in skin colour at the treated site.
Key interactions
- It can weaken latex condoms and diaphragms, so they cannot be relied on while in contact with the cream.
- There are few well-established interactions with other medicines, but tell your prescriber what you use.
- Using other skin treatments on the same area at the same time should be checked with your prescriber.
Available as: A cream applied to the skin, often supplied in single-use sachets.
Answers
Imiquimod: frequently asked questions
What is imiquimod used for?
It is used to treat external genital and anal warts, sun-damaged skin patches called actinic keratosis, and certain superficial skin cancers, by prompting the immune system to clear abnormal cells.
Why does the skin get so red and sore?
Imiquimod works by stirring up the skin's immune response, so redness, soreness and scabbing are expected and show the medicine is working; tell your prescriber if it becomes very severe.
Can I still use condoms while on it?
Imiquimod can weaken latex condoms and diaphragms, so they cannot be relied on for contraception or protection while the cream is in contact with them.
How do I apply it?
Apply a thin layer to the affected skin only, on the days and times your prescriber sets, leave it on for the recommended time, then wash it off, washing your hands before and after.
Will it make me feel unwell?
Some people get flu-like effects such as tiredness, aches or a mild fever; tell your prescriber if these are troublesome.
Authoritative sources
- BNF
- NICE CKS
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