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Boric acid vaginal inserts for vulvovaginal yeast infections

Safety and Efficacy Study to Assess 600 mg Boric Acid Vaginal Inserts With 7- or 14-Days Treatment of Vulvovaginal Candidiasis (VVC)

Phase 3 Interventional pH-D Feminine Health LLC · NCT07109869

This study will test whether 600 mg boric acid vaginal inserts taken for 7 or 14 days help people with symptomatic vulvovaginal candidiasis compared with placebo.

Quick facts

PhasePhase 3
Study typeInterventional
Enrollment400 (estimated)
Ages12 Years and up
SexFemale
SponsorpH-D Feminine Health LLC Industry-sponsored
Drugs / interventionsradiation, methotrexate
Locations27 sites (Mobile, Alabama and 26 other locations)
Trial IDNCT07109869 on ClinicalTrials.gov

What this trial studies

This is a multi-center, randomized, double-blind, placebo-controlled Phase 3 trial with three arms comparing 600 mg boric acid vaginal inserts given for 7 days or 14 days against placebo. Participants self-administer one insert daily and use an electronic diary to record symptoms, adverse events, sexual activity, and menstrual details through Day 28. Eligible participants must have microscope-confirmed yeast on a KOH or saline wet mount, vaginal pH ≤4.5, and a minimum vulvar signs and symptoms score. Safety and tolerability as well as clinical efficacy endpoints will be collected across study visits at participating U.S. centers.

Who should consider this trial

Good fit: Post-menarche, nonpregnant people assigned female at birth aged 12 years and older with acute symptomatic VVC confirmed by KOH/saline wet mount, vaginal pH ≤4.5, and a VSS score ≥4 (with age ≥21 requiring acceptable recent cervical screening) are suitable candidates.

Not a fit: People who are pregnant, who lack microscope-confirmed yeast, who have non-Candida vaginal infections, or who cannot use intravaginal products are unlikely to benefit from this treatment.

Why it matters

Potential benefit: If successful, this could provide an effective, well-tolerated intravaginal treatment option for symptomatic vulvovaginal candidiasis, including cases that do not respond to standard azole therapy.

How similar studies have performed: Boric acid has been used off-label and smaller randomized and observational studies and clinical experience suggest benefit for recurrent or azole-resistant VVC, but high-quality phase 3 evidence has been limited.

Eligibility criteria

Show full inclusion / exclusion criteria 
Inclusion Criteria

1. Patients who are postmenarcheal, nonpregnant biological females, 12 years of age and older, at Screening;
2. Patients with acute symptomatic VVC infection at Screening, defined as meeting all of the following criteria:

   * A potassium hydroxide (KOH) wet mount or saline wet mount preparation performed from the inflamed vaginal mucosa or secretions demonstrating yeast forms (hyphae or pseudohyphae) of or budding yeast;
   * Vaginal pH ≤4.5; and
   * Total Vulvar Signs and Symptoms (VSS) Scale score of ≥4: vulvovaginal signs (edema, erythema, and excoriation/fissures) and symptoms (vulvovaginal burning, itching, and irritation) as rated using the VSS Scale.
3. Patients aged 21 and older must have cervical cancer screening results meeting the following criteria for inclusion at Screening or within the 1 year prior to Screening: negative for intraepithelial lesion or malignancy or clinically insignificant findings not requiring any further surveillance or treatment beyond a repeat cervical cytology test;

   * Patients between 21 and 29 years of age must have a cervical cancer screening test (Papanicolaou \[Pap\] smear) performed at Screening or have a documented Pap smear result within 1 year of Screening which must be available for the assessment by the PI or qualified designee at the Screening Visit; and
   * Patients 30 years of age and older must have documented cervical cancer screening tests (Pap smear and high-risk human papillomavirus \[HPV\]) performed at Screening or have documented results within 1 year of Screening which must be available for the assessment by the PI or qualified designee at the Screening Visit.
4. Patients must be suitable candidates for vaginal treatment, able to insert the study drug, and are comfortable undergoing pelvic exams;
5. Patients willing and able to provide written informed consent or assent (for those 12 to 17 years of age);
6. Patients willing and able to comply with Protocol requirements, instructions, and Protocol-stated restrictions, as determined by the PI;
7. Patients willing and able to give authorization for use of protected health information;
8. Patients of childbearing potential (as defined in Inclusion Criterion 1) must use 1 of the following contraceptive options described below through Day 28 (Visit 5):

   * Copper intrauterine device used continuously and successfully for at least 90 days prior to the first dose of study drug;
   * Levonorgestrel-releasing intrauterine system used successfully for at least 90 days prior to the first dose of study drug;
   * Progestin implant used successfully for at least 90 days prior to the first dose of study drug;
   * Monogamy with a vasectomized male partner (medical assessment of the surgical success of the vasectomy must have occurred at least 6 months prior to the first dose of study drug);
   * Abstinence; or
   * Use of 1 of the following hormonal methods in combination with 1 of the following barrier methods:

     * Hormonal methods
     * Barrier methods
9. Patients must be willing to avoid tampon or menstrual cup use during the Treatment Period (ie, Day 1 to Day 14); and
10. Patients must be willing to abstain from receiving oral intercourse during the Treatment Period (ie, Day 1 to Day 14).

Exclusion Criteria:

1. Patients with known or suspected other active infectious causes of cervicitis, vaginitis, or vulvitis (eg, BV, Chlamydia trachomatis, Neisseria gonorrhoeae, T. vaginalis, or genital lesions consistent with HPV, herpes simplex, syphilis, chancroid, etc) based on the results of clinical assessments, in-clinic microscopic assessments (eg, clue cells or trichomonads detected on saline wet mount), and/or rapid diagnostic tests (RDTs) performed prior to enrollment (eg, OSOM® test, etc);
2. Patients who have undergone any vaginal rejuvenation procedure (ie, laser) within 4 weeks prior to Screening or plan to undergo a vaginal rejuvenation procedure prior to completion of the last planned assessment;
3. Patients who will undergo evaluation or treatment during the clinical study for abnormal cytology or findings from high-risk HPV testing or Pap test finding;
4. Patients diagnosed with BV, determined by meeting 3 of the 4 Amsel's criteria:

   * A fishy odor of the vaginal discharge before or after the addition of a drop of 10% KOH (ie, a positive whiff test);
   * Homogenous, thin discharge (milk-like consistency) that smoothly coats the vaginal walls;
   * At least 20% of epithelial cells are clue cells (eg, vaginal epithelial cells studded with adherent bacteria) on saline wet mount microscopic evaluation of vaginal discharge; or
   * pH of vaginal fluid \>4.5.
5. Patients currently undergoing treatment for or with a history of treatment for cervical, vaginal, or vulvar cancer;
6. Patients using any systemic (eg, oral or injectable) corticosteroid treatment during the study or within 30 days prior to Screening;
7. Patients using topical steroids applied to the vulvar or vaginal regions during the study or within 7 days prior to Screening;
8. Patients using any systemic (eg, oral or injectable) or topical (applied to the vulvar or vaginal regions) antimicrobials including antifungal, antiviral, antibacterial, or anti-trichomonal drugs during the clinical study or within 14 days prior to Screening;
9. Patients using any prescription (eg, vaginal estrogen, ospemifene, prasterone) or non-prescription intravaginal or vulvar product (eg, vitamin E gel capsules \[vaginal inserts\], lubricants, moisturizers, douches, creams, or spermicides) within 7 days prior to Screening and through Day 28 (Visit 5);
10. Patients unwilling to refrain from the use of intravaginal products (eg, douches, creams, spermicides, yoni eggs, tampons, menstrual cups, and any other such intravaginal product that, in the opinion of the PI, would be considered exclusionary) during the Treatment Period, inclusive of Day 14;
11. Patients with a current immunocompromising condition (ie, HIV, end-stage renal disease);
12. Patients using any immunosuppressive medication (included, but not limited to, carbamazepine, cyclosporine, tacrolimus, methotrexate, 6 mercaptopurine, or mycophenolate) or radiation treatment within 3 months prior to Screening or during the clinical study;
13. Patients with a history of pelvic radiation treatment;
14. Patients with a clinically significant major organ disease, cancer, infection (except acute VVC), or other condition that may affect the clinical assessment of VVC or render the patient a poor study candidate, per the PI's judgment;
15. Patients with any comorbid condition that would preclude the safe participation of the patient in the clinical study or would prevent the patient from meeting the clinical study requirements, per the PI's judgment;
16. Patients with diabetes mellitus type I, use of insulin (current or anticipated need during the study), or poorly-controlled diabetes mellitus type II, defined as (hemoglobin A1c \[(HbA1c\]) of 10% or higher result within the prior 6 months) or at Screening;
17. Patients with any laboratory abnormality that, in the opinion of the PI, would likely introduce additional risk to the patient or might interfere with data interpretation. The findings noted below are particularly exclusionary:

    * Serum alanine aminotransferase ≥2.5 × the upper limit of normal (ULN) of the reference range;
    * Serum aspartate aminotransferase ≥2.5 × the ULN of the reference range; or
    * Serum total bilirubin ≥2 × the ULN of the reference range, unless the elevation is consistent with Gilbert's syndrome
18. Patients with a known history of HIV, hepatitis B, or hepatitis C virus (HCV), or a positive test for HIV antibody, hepatitis B surface antigen, or HCV antibody;
19. Patients who are pregnant (ie, a positive pregnancy test at Screening), lactating, or planning to become pregnant during the clinical study period;
20. Patients with a planned surgery or other medical procedure that would impact compliance with the Protocol, per the PI's discretion;
21. Patients with a current or recent history (eg, the past 12 months) of substance abuse (including alcohol) or any other medical, psychiatric, or other condition that, in the PI's opinion, would preclude compliance with the Protocol;
22. Patients currently participating or had participated in another clinical study within the 30 days prior to Screening;
23. Patients currently have or expect, within the Treatment Period, to have heavy menstrual bleeding (defined as "flooding" or bleeding through ≥1 tampon or sanitary pad in 2 hours or less with most periods) or a menstrual duration \>7 days; or
24. Patients currently have or suspect to have an active urinary tract infection (UTI) based on urinalysis and clinical assessment.

Where this trial is running

Mobile, Alabama and 26 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
View on ClinicalTrials.gov → Find more trials like this →
Conditions Vulvovaginal CandidiasesVulvovaginal Candidiasis, GenitalVulvovaginal CandidiasisVVC
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.