An iodine-based antiseptic for skin, wounds and gargles
Povidone-iodine
An over-the-counter iodine-based antiseptic used to clean skin and minor wounds and, in some forms, as a gargle for sore throats.
What is Povidone-iodine?
Povidone-iodine is an iodine-based antiseptic, best known as Betadine, used to clean the skin and minor wounds and to disinfect skin before procedures. It is also available as a gargle or mouthwash for sore throats and mouth infections. It kills a broad range of germs, including many bacteria, fungi and viruses, and is applied to the skin or used as a gargle as directed on the pack. Because it contains iodine, it should be used with care in people with thyroid problems, during pregnancy and breastfeeding, on large areas, or if there is an iodine allergy, so it is worth checking with a pharmacist in these situations. It can temporarily stain the skin and clothing a brown-orange colour.
Education and reference only. This is a plain-language guide to Povidone-iodine — 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
Povidone-iodine is an antiseptic that releases iodine, a powerful germ-killer, in a form that is gentler on the skin than iodine alone. It is widely used in hospitals and at home to clean the skin and minor wounds, to disinfect skin before injections or minor procedures, and in some products as a gargle or mouthwash for sore throats and mouth infections. It comes as a solution, antiseptic wash, ointment, dry powder spray and gargle, most familiar under the brand name Betadine. It is available without a prescription and is valued for its broad action against bacteria, fungi and viruses.
How it works
Povidone-iodine works by slowly releasing iodine, which is highly effective at killing germs. The iodine attacks key parts of bacteria, fungi and viruses, including their proteins and other essential structures, so that they can no longer survive. Because it covers such a broad range of microbes, it is useful both for cleaning wounds and for disinfecting skin before procedures. The povidone part holds the iodine and releases it gradually, which makes it less harsh than iodine on its own while keeping its strong germ-killing power. Its action is local, working on the skin, wound or throat where it is applied.
Company & origin
Originated / developed by: Various (widely available).
A widely used iodine-based antiseptic across the UK, best known as Betadine, used to clean skin and wounds and as a gargle for sore throats.
Practical use
How to take Povidone-iodine
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Apply it to the skin or minor wound, or use the gargle as a mouth rinse, following the pack instructions for that product.
- For a gargle, swill it around the mouth and throat and then spit it out rather than swallowing it.
- Avoid using it on large areas or for long periods without advice, because of the iodine content.
- Be aware it can stain skin and clothing a brown-orange colour.
- Check with a pharmacist first if you have thyroid problems, are pregnant or breastfeeding, or have an iodine allergy.
Weighing it up
Advantages & disadvantages of Povidone-iodine
Advantages
- Kills a broad range of germs, including many bacteria, fungi and viruses.
- Available in many forms, including solutions, washes, ointments and gargles.
- A well-trusted antiseptic for cleaning skin and minor wounds.
Disadvantages
- Contains iodine, so needs caution in thyroid disease, pregnancy and on large areas.
- Can stain the skin and clothing a brown-orange colour.
- Not suitable for people with an iodine allergy.
Practical use
Good to know
Povidone-iodine is a strong, broad-acting antiseptic, but because it contains iodine, some of which can be absorbed, it needs extra care in certain situations. It should be used cautiously, and ideally after checking with a pharmacist or GP, by people with thyroid disease, during pregnancy and breastfeeding, and when it would be applied to large areas or used regularly over time, as too much iodine can affect the thyroid. People with a known iodine allergy should avoid it. It can stain the skin a brown-orange colour and may mark clothing, though skin staining washes off in time. It is for external use or, in gargle form, for swilling and spitting out rather than swallowing. As with other antiseptics, deep, large or seriously contaminated wounds, and any wound that looks infected, should be assessed properly rather than just treated at home.
Who should not take it / use with caution
- People with a known allergy to iodine or povidone-iodine should not use it.
- It should be avoided or used only on advice in people with thyroid disease and during pregnancy and breastfeeding.
- It should not be used on large areas or regularly over long periods without medical advice, because of iodine absorption.
Monitoring
- No routine monitoring is needed for occasional small-area use.
- Considering thyroid checks if it is used on large areas or for long periods.
- Watching wounds for signs of infection that need medical review.
Side effects
- Temporary brown-orange staining of the skin, and stinging or irritation where applied.
- An allergic skin reaction in people sensitive to iodine.
- Effects on the thyroid if large amounts are absorbed over time, especially with heavy or prolonged use.
Key interactions
- It can react with some other wound products, such as those containing hydrogen peroxide or silver, so avoid using them together.
- Iodine absorbed from it can affect thyroid tests and treatment, so tell your doctor if you use it a lot.
- Tell the pharmacist about any other antiseptics or wound dressings you are using.
Available as: Antiseptic solution, wash, ointment, dry powder spray and gargle.
Answers
Povidone-iodine: frequently asked questions
What is povidone-iodine used for?
It is an iodine-based antiseptic used to clean the skin and minor wounds, disinfect skin before procedures, and in some forms as a gargle for sore throats.
Why does it stain my skin orange?
It contains iodine, which gives it a brown-orange colour. The staining on skin is temporary and washes off in time, but it can also mark clothing.
Can I use it in pregnancy?
Because it contains iodine that can be absorbed, it is best used cautiously and only after checking with a pharmacist, GP or midwife during pregnancy and breastfeeding.
Can I use it if I have thyroid problems?
People with thyroid disease should be cautious, as absorbed iodine can affect the thyroid. Check with a pharmacist or GP, especially before using it on large areas or for long periods.
Can I swallow the gargle?
No. The gargle should be swilled around the mouth and throat and then spat out, not swallowed.
Authoritative sources
- BNF
- NICE CKS
Building a medicines information resource?
We create evidence-led, dose-free drug and formulary references for teams.