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Povidone-iodine, also well-known as brand-name Betadine, is a broad-spectrum antiseptic that can kill yeast, and it has historically been used vaginally for thrush as a douche or pessary. It is not, however, a first-line or recommended treatment: antifungal medicines — such as clotrimazole pessaries or a single fluconazole tablet — are the standard treatment and clear around 80 to 90 per cent of infections.3 Povidone-iodine is non-selective, so it also kills the protective lactobacilli that keep the vagina healthy.1
In our own clinic we don’t use povidone-iodine — we have gentler options we find more reliable — but it is inexpensive and easy to get from a pharmacy, so it can be a reasonable fallback if you have a genuine need and few other options to hand.
What the evidence actually shows
Povidone-iodine has antiseptic activity against a wide range of microbes, including yeast. But the 1992 study often cited for vaginal douching did not test whether it cures thrush. It studied healthy women and found that povidone-iodine reduced the total number of vaginal bacteria more than saline or a vinegar solution — including the protective lactobacilli — and the authors warned that this disruption could let potential pathogens proliferate and raise the risk of infection.1
Because povidone-iodine wipes out protective flora along with everything else, and because douching itself is a known cause of vaginal dysbiosis,2 it is not a treatment most practitioners would recommend for thrush.
How to use povidone-iodine to treat a vaginal yeast infection – safety first!
There are some important safety notes for women who wish to use povidone-iodine as a vaginal douche for a yeast infection/thrush.
Anyone with thyroid issues should avoid douching with povidone-iodine for any reason without medical supervision.
Povidone-iodine necessarily contains iodine, which is used by the thyroid gland to make thyroid hormones. The vagina is mucous membranes, and this tissue is absorbent, which means that when you put Betadine into the vagina as a douche, a significant amount of iodine is absorbed into the bloodstream — one study measured serum iodine rising several-fold within minutes of a vaginal application.4
Do not use povidone-iodine vaginally during pregnancy or while breastfeeding. The absorbed iodine reaches the baby, whose developing thyroid is especially sensitive, and vaginal or douched iodine has been linked to thyroid problems in the fetus and in breastfed babies.4,5
How to use povidone-iodine vaginally
We have loads of information about using povidone-iodine vaginally on our povidone-iodine page, If you and your practitioner have decided it is appropriate and safe for you, you can make your own douche or buy the Betadine douche ready-made.
Don’t douche regularly, and if you continue to have issues with thrush/yeast, see your health professional for more comprehensive care. Something is going wrong that needs fixing, which may be deeper than just a vaginal overgrowth of yeast.
Why studies on douching with povidone-iodine are rare
There are ethical issues with prescribing douching since douching is a well-known cause of vaginal dysbiosis.2 Completing a study that directly contradicts our understanding of the vaginal ecosystem is problematic for ethics committees, who approve scientific studies.
Frequently asked questions
Does povidone-iodine cure thrush?
It can kill yeast, and it has been used vaginally, but it is not a recommended or first-line treatment. Antifungal medicines are standard and clear most infections, whereas povidone-iodine also destroys the protective lactobacilli.13
Is Betadine safe to use in the vagina?
Not for everyone. It is absorbed into the bloodstream, so anyone with a thyroid condition should avoid it without medical supervision, and it should not be used vaginally during pregnancy or breastfeeding because of the risk to the baby’s thyroid.45
This article is general information and not a substitute for personalised medical advice. Do not use povidone-iodine vaginally if you have a thyroid condition (without medical supervision), or during pregnancy or breastfeeding; antifungal medicines are the recommended treatment for thrush, so please see an experienced practitioner.
- Onderdonk AB, Delaney ML, Hinkson PL, et al. Quantitative and qualitative effects of douche preparations on vaginal microflora. Obstetrics & Gynecology. 1992;80(3):333–338.
- Martino JL, Vermund SH. Vaginal douching: evidence for risks or benefits to women’s health. Epidemiologic Reviews. 2002;24(2):109–124.
- Centers for Disease Control and Prevention. Vulvovaginal candidiasis — STI treatment guidelines, 2021. CDC; 2021.
- Vorherr H, Vorherr UF, Mehta P, Ulrich JA, Messer RH. Vaginal absorption of povidone-iodine. JAMA. 1980;244(23):2628–2629.
- Povidone-iodine. Drugs and Lactation Database (LactMed). National Institute of Child Health and Human Development; 2023.
