Boric acid vaginal suppositories can be useful for treating yeast infections, though some individuals — including people who may be pregnant — should not use them.
If you experience recurrent or persistent yeast infections, boric acid might be a treatment to consider. It’s been used for vaginal infections for more than a century.
Beyond antifungal activity, boric acid also has antiviral and antibacterial effects. It’s effective against Candida albicans as well as the tougher-to-treat Candida glabrata strains.
Boric acid is sold over the counter and is often placed into gelatin capsules that are then inserted into the vagina.
Continue reading to learn more about this inexpensive and widely used treatment option.
What is boric acid?
Boric acid is a water-soluble chemical composed of boron, oxygen, and hydrogen. It appears as a white powder or crystalline substance.
Researchers think boric acid possesses antifungal and antibacterial qualities.
Dilute boric acid solutions are sometimes used for skin issues such as diaper rash, insect bites, athlete’s foot, foot odor, and yeast infections.
What the research says
In a review, investigators assessed multiple studies on boric acid for recurrent vulvovaginal candidiasis.
They identified 14 studies overall — including two randomized clinical trials, nine case series, and four case reports. Reported cure rates with boric acid ranged from 40% to 100%, and none of the studies noted large differences in recurrence rates of yeast infections.
The authors concluded that, based on available evidence, boric acid is a safe substitute for other therapies. It is also a cost-effective option compared with standard treatments that may not be effective against non-albicans or azole-resistant yeast strains.
Recommendations for how to use boric acid varied across studies. One study compared suppository use for 2 weeks versus 3 weeks and found little to no benefit from the longer regimen.
Another study examined boric acid’s effectiveness for recurrent yeast infections and found that suppositories managed recurring infections effectively with few side effects.
How to use boric acid suppositories
Before trying boric acid suppositories, see your healthcare provider for a diagnosis. They can advise on proper use of boric acid and other alternative approaches.
Premade boric acid suppositories are available at many pharmacies and online.
Common brands include:
You can also make your own capsules. Purchase boric acid powder (available online) and size 00 gelatin capsules.
Fill the capsule by scooping or funneling the powder inside. Use a knife to scrape away any excess from the top, then close the capsule securely.
Whether using commercial suppositories or homemade capsules, the typical dose is 600 milligrams per day, inserted vaginally once daily for approximately 7 to 14 days.
To insert the suppository:
- Wash your hands thoroughly before removing the capsule from its packaging.
- Although insertion angles vary, many find it easiest to lie on their back with knees bent. You can also stand with knees slightly bent and feet apart.
- Gently push one suppository into the vagina as far as comfortable, using a finger or an applicator similar to those used for antifungal products.
- If an applicator was used, discard it when finished.
- Wearing a panty liner may be helpful, as some discharge can occur after insertion.
- Wash your hands again before resuming daily activities.
Try to insert the suppository at the same time each day; many people prefer bedtime.
Other practical tips:
- Some improvement can appear within a day, but complete the entire treatment to reduce the chance of recurrence.
- For an acute infection, some providers suggest inserting capsules twice daily for 7 to 14 days.
- For chronic or recurrent infections, once-daily suppositories may be advised.
- Always consult your healthcare provider about dosing, frequency, and specific concerns.
Possible side effects and risks
While boric acid suppositories are generally safe for adults, they carry some risks.
Potential side effects include:
- burning where the suppository is inserted
- watery vaginal discharge
- redness or irritation in the vaginal area
If you have intense discomfort, stop using the product. See your healthcare provider if symptoms continue after stopping treatment.
Do not use boric acid suppositories if:
- you are pregnant, as the compound can be harmful to a developing fetus
- you have a cut, abrasion, or other open wound in the vaginal area
Boric acid is poisonous if swallowed, so it should only be administered as a vaginal suppository, not taken orally.
Other treatment options for yeast infections
Boric acid is particularly useful for infections caused by Candida glabrata. Other treatments, such as topical flucytosine (Ancobon), also address this more resistant species.
Ancobon may be used alone or alongside suppositories. In a study, women who did not respond to boric acid were treated with topical flucytosine nightly for two weeks; 27 of 30 women (90%) responded to that treatment.
Ancobon and similar antifungals require a prescription. Discuss these options with your healthcare professional.
Yeast infection prevention tips
Maintaining immune health and practicing good hygiene can reduce your risk of yeast infections. Consider these preventive strategies:
- Take probiotic supplements or consume probiotic-rich foods.
- Follow a well-balanced, nutritious diet.
- Wear breathable, loose-fitting clothing.
- Avoid douching or using harsh soaps in the genital area.
- Clean gently with mild soap and warm water.
- Change out of wet clothing promptly.
- Limit time spent in hot tubs or prolonged hot baths.
- Manage diabetes and other health conditions effectively.
When to see a doctor
If you’ve never had a yeast infection before, schedule an appointment with your healthcare provider to confirm the diagnosis. Conditions like bacterial vaginosis and certain sexually transmitted infections can cause similar symptoms.
Mild yeast infections can often be treated with over-the-counter products. However, if symptoms don’t improve within 7 to 10 days after treatment or the infection recurs, contact your healthcare provider.
Frequently asked questions
How long does it take for boric acid to treat a yeast infection?
Boric acid typically clears a yeast infection within 1 to 2 weeks of treatment. Symptom relief is often noticeable within a few days of starting therapy.
Can boric acid be used as a preventive against yeast infections?
Some clinicians may recommend boric acid for preventing recurrent yeast infections. They might suggest inserting a boric acid suppository once or twice weekly for 3 to 4 months to help prevent recurrences.
Who should avoid using boric acid?
Avoid boric acid suppositories if you have any open sores, ulcers, or wounds in the vaginal area. Boric acid can be toxic if swallowed or applied to open wounds. Also avoid using it if you’re pregnant or breastfeeding.
Takeaway
If you have repeated yeast infections or a stubborn current infection, boric acid suppositories may help resolve it.
Discuss this treatment with your healthcare provider to determine whether it’s an appropriate option for you.
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