Boric acid suppositories have long been used for treating vaginal yeast infections. They are often considered a second-line treatment for yeast infections when antifungals are not working. For some women with compromised immune systems, these suppositories may be more effective than other treatments. Boric acid may be especially effective for treating infections caused by non-C. albicans species or that are resistant to azole antifungals.

Vulvovaginal Candidiasis Treatment

Vulvovaginal candidiasis, commonly called a yeast infection, is caused by an overgrowth of candida fungi or yeasts in the vagina. These fungi often exist naturally in the vagina and are kept in balance. When there is an imbalance that causes an overgrowth of candida, however, it can lead to symptoms of an infection. These symptoms can include itching, vaginal soreness, pain during sex, pain urinating, and abnormal vaginal discharge. Boric acid treats the infection by interrupting the lifecycle of both C. albicans and C. glabrata and preventing their overgrowth.

Using Boric Acid Suppositories

Boric acid is usually dispensed in 600mg suppositories for use 1-2 times per day for 2-4 weeks. No more than one suppository should be used at a time. The suppositories are inserted vaginally, often at bedtime if used once per day. There may be some burning and irritation associated with the use of the boric acid which is normal. If there is any broken skin that the boric acid could come in contact with, avoid the use of these suppositories to prevent systemic side effects which could be serious. The majority of women who use this treatment will experience only mild side effects.

In general, if an over-the-counter antifungal treatment does not work, women should always consult their healthcare provider. Needing to use repeated courses of OTC antifungal treatments often means underlying conditions are being undiagnosed. Boric acid suppositories may be an option when antifungals do not work. For pregnant women, only topical antifungals should be used. Boric acid should never be used for pregnant women as it has a risk of teratogenic effects.

Research and Articles

Boric Acid for Recurrent Vulvovaginal Candidiasis: The Clinical Evidence – Journal of Women’s Health

Boric Acid Vaginal Suppositories: A Brief Review – Infectious Diseases in Obstetrics and Gynecology