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Boric Acid Explained: Safety Quick Reference
Boric acid suppositories are for vaginal use only and are poisonous if swallowed, so keep them away from children and pets. Clinicians reserve them mainly for recurrent or hard-to-treat yeast infections, with limited data in recurrent BV, and they are not recommended in pregnancy. Get a diagnosis first and follow the product label or your clinician.
How to use it
- Read each row for one safety question about boric acid suppositories.
- Use it to prepare for a conversation with your clinician, not to choose a treatment yourself.
- For how much and how long, follow the product label or your clinician. This page gives no dosing instructions.
- If a person swallows boric acid, call Poison Help at 1-800-222-1222 or emergency services right away.
Reference
| Question | What the guidance or evidence says | Source |
|---|---|---|
| How is it used? | Only inside the vagina, as a capsule. Never by mouth. | CDC treatment guidelines |
| What if it is swallowed? | Boric acid is a dangerous poison. For a person, call Poison Help at 1-800-222-1222 or emergency services right away; for a pet, call a veterinarian at once. | MedlinePlus (NIH) |
| Children and pets | Store it out of reach of children and pets. MedlinePlus notes that the infant death rate from boric acid poisoning is high. | MedlinePlus (NIH) |
| Pregnancy, trying to conceive or breastfeeding | Not recommended in pregnancy; for yeast infections in pregnancy CDC lists only topical azole treatment. If you are trying to conceive or breastfeeding, ask a clinician before any use. | CDC treatment guidelines |
| Who it is mainly used for | Recurrent yeast infections, especially types that respond poorly to standard azole antifungals, usually after other treatment and with a specialist's input. | CDC treatment guidelines; 2011 review |
| Does it stop yeast from coming back? | A 2011 review of 14 studies found vaginal boric acid cleared yeast in 40% to 100% of cases, with no study showing fewer recurrences. | 2011 review (PubMed) |
| Recurrent BV | CDC says limited data suggest a clinician-directed plan that places boric acid between antibiotic phases might be an option after multiple recurrences. It is not used on its own. | CDC treatment guidelines |
| Long-term use | A retrospective chart review found women used maintenance vaginal boric acid for an average of 13 months with few adverse events, but did not test whether it works. | 2019 chart review (PubMed) |
| Side effects reported | Vaginal burning in under 10% of cases in the 2011 review, plus watery discharge and redness. | 2011 review (PubMed) |
| How much and how long? | Follow the product label or your clinician. This page gives no dosing instructions. | Product label or your clinician |
Get a diagnosis first
Yeast infections, BV and some sexually transmitted infections can look alike. CDC notes that unnecessary over-the-counter use can delay treatment of the real cause.
Stop and call a clinician
Stop using it and contact a clinician with severe burning, bleeding that is not your period, a rash, fever or pelvic pain.
What it does not do
Boric acid is an antiseptic. It does not restore vaginal lactobacilli, and it does not treat sexually transmitted infections.
How this tool works
This is a fixed reference card built from CDC treatment guidelines, the NIH MedlinePlus entry on boric acid poisoning, and peer-reviewed research also cited in our full boric acid article. It has no inputs and gives no result. It gives no dosing instructions and does not recommend any product.
Frequently asked questions
Is boric acid safe to use vaginally?
It is used vaginally under clinician guidance, mainly for recurrent yeast infections. Reported side effects are mostly local, such as burning, watery discharge and redness. It is poisonous if swallowed, is not recommended in pregnancy, and should be used only after a diagnosis.
What happens if boric acid is swallowed?
MedlinePlus calls boric acid a dangerous poison. If a person swallows it, call Poison Help at 1-800-222-1222 or emergency services right away. If a pet swallows it, call a veterinarian at once. Do not wait for symptoms.
Can I use boric acid while pregnant or trying to conceive?
Boric acid is not recommended in pregnancy, and CDC lists only topical azole treatment for yeast infections during pregnancy. If you are trying to conceive or breastfeeding, ask your clinician before using it.
Does boric acid help BV?
CDC says limited data suggest boric acid might be one step in a clinician-directed plan for multiple BV recurrences, placed between antibiotic phases. A 2023 review notes the only FDA-approved BV treatments are antibiotics, so it is not a substitute.
How much boric acid should I use, and for how long?
Follow the product label or your clinician's directions. This reference intentionally gives no dosing instructions, because the right course depends on what is being treated and needs a diagnosis first.
Does boric acid keep yeast infections from coming back?
Current evidence does not show that. A 2011 review of 14 studies found vaginal boric acid cleared yeast in 40% to 100% of cases, with no study showing fewer recurrences.
When should I see a clinician first?
Before any first use: if this is your first episode, if you are unsure what is causing symptoms, or if you have fever, pelvic pain, sores or unusual bleeding. CDC also advises an evaluation when symptoms persist after an over-the-counter treatment or return within 2 months.
Sources
- CDC: Vulvovaginal Candidiasis, STI Treatment Guidelines
- CDC: Bacterial Vaginosis, STI Treatment Guidelines
- MedlinePlus (NIH): Boric acid poisoning
- Review (2011): boric acid for recurrent vulvovaginal candidiasis, PubMed
- Chart review (2019): boric acid maintenance therapy, PubMed
- Review (2023): approaches to BV treatment and prevention, PubMed
This tool gives general information for adults and does not diagnose or treat any condition. It is not a substitute for advice from a clinician. If you have severe symptoms, fever, or are pregnant, contact a healthcare professional.