Bacterial vaginosis (BV) is treated with prescription antibiotics, typically taken for five to seven days. It’s the most common vaginal infection in women of reproductive age, and while antibiotics clear it effectively, recurrence is extremely common: 50% to 80% of women experience BV again within 6 to 12 months of finishing treatment. That high recurrence rate is what makes BV so frustrating, and it’s why getting rid of it often means thinking beyond just the initial prescription.
Why BV Keeps Coming Back
BV happens when the balance of bacteria in the vagina shifts. Normally, beneficial bacteria called lactobacilli dominate and keep the environment acidic (below pH 4.5), which suppresses the growth of other organisms. When those protective bacteria lose their foothold, other species multiply and form what’s called a biofilm on the vaginal wall. This biofilm is essentially a sticky, protective layer that shields the bacteria from the body’s natural defenses. Research published in the American Journal of Obstetrics & Gynecology found that bacteria in biofilm form can tolerate four to eight times higher concentrations of lactic acid and five times more hydrogen peroxide than free-floating bacteria. In practical terms, even after antibiotics kill off the infection, remnants of that biofilm can survive and reseed a new imbalance weeks or months later.
First-Line Antibiotic Treatment
The CDC recommends three main options for treating BV. The first is an oral antibiotic (metronidazole) taken twice a day for seven days. The second is a vaginal gel version of the same antibiotic, applied once a day for five days. The third is a vaginal cream (clindamycin) applied at bedtime for seven days.
All three work well for the initial episode. The oral pill is convenient but more likely to cause nausea and stomach upset. The vaginal options deliver medication directly where it’s needed and tend to cause fewer digestive side effects, though some women find the creams messy. Your provider will help you choose based on your preferences and whether you’re pregnant or breastfeeding.
One important note: if you’re pregnant and have BV, treatment matters even more. Untreated BV during pregnancy increases the chance of premature delivery and low birth weight (under 5.5 pounds).
Partner Treatment: A New Recommendation
For years, treating sexual partners wasn’t considered useful for BV. That changed in 2025 when the American College of Obstetricians and Gynecologists recommended, for the first time, that male sexual partners of women with recurrent BV be treated with a combination of oral and topical antibiotics at the same time. Growing evidence now implicates sexual activity as a risk factor for recurrence, and the bacteria responsible for BV can persist in the genital tract of male partners, reintroducing them during sex. If you’re dealing with BV that keeps returning, this is worth discussing with your provider.
Probiotics and Restoring Vaginal Balance
Because BV is fundamentally about losing protective bacteria, replenishing them makes intuitive sense. The research backs this up in specific cases. A clinical study tested vaginal capsules containing two specific probiotic strains (Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14) inserted nightly for five days. At the 30-day follow-up, 90% of women in the probiotic group were cured, compared to 55% in the antibiotic-only group. These results are striking, though the study was small (40 women total).
Not all probiotics are interchangeable. The strains matter. General gut-health probiotics won’t necessarily colonize the vagina. If you want to try probiotics, look for products that specifically contain the GR-1 and RC-14 strains, or ask your provider for a recommendation. Some women use probiotics alongside antibiotics rather than instead of them, aiming to both kill the overgrowth and repopulate with beneficial bacteria.
Home Remedies: What Works and What Doesn’t
Hydrogen peroxide douching is one of the most searched home remedies for BV. A randomized trial of 142 women compared a single hydrogen peroxide douche to a single dose of oral metronidazole. The cure rate for hydrogen peroxide was 62.5%, compared to 78.6% for the antibiotic. So it does have some antibacterial effect, but it’s less effective, and researchers have flagged a real risk: hydrogen peroxide can cause severe lesions in the vaginal lining due to its caustic properties. The lower side effect rate in the study (13.9% versus 48.6% for metronidazole) was largely because the comparison was against GI side effects from oral antibiotics, not local tissue damage. Douching of any kind is generally discouraged because it disrupts the vaginal microbiome further.
Boric acid suppositories are another popular option, particularly for recurrent BV. While some providers do recommend them as an adjunct therapy, the CDC’s current treatment guidelines don’t include boric acid as a recommended regimen for BV. If you’re considering it, talk to your provider rather than self-treating.
Preventing Recurrence
Given that the majority of women will see BV return after treatment, prevention is arguably the most important piece. The vaginal microbiome is sensitive to a range of disruptions, and maintaining a pH below 4.5 is the single most protective factor. Women with a healthy, lactobacillus-dominant microbiome tend to have a vaginal pH around 4.5 or lower, while those with BV-associated bacteria often have a pH of 6.0 or higher.
Practical steps that help maintain that acidic environment:
- Avoid douching entirely. This strips away protective bacteria and raises pH, creating the exact conditions BV thrives in.
- Use unscented products. Fragranced soaps, body washes, and feminine hygiene sprays can irritate vaginal tissue and shift bacterial balance. Clean the external area with warm water or a mild, unscented soap.
- Wear breathable underwear. Cotton or moisture-wicking fabrics reduce the warm, moist conditions that favor bacterial overgrowth.
- Consider condom use. Since sexual activity is now recognized as a risk factor for BV recurrence, consistent condom use can reduce exposure to bacteria that disrupt vaginal flora.
- Change out of wet clothing promptly. Sitting in a wet swimsuit or sweaty workout clothes for hours creates an environment that favors pH changes.
Blood sugar may also play a role in vaginal health. Recent research found that postmenopausal women taking a type of diabetes medication that increases sugar excretion had significantly higher rates of protective vaginal bacteria (57% versus 8%). The hypothesis is that sugar availability in the vaginal environment may feed beneficial lactobacilli. While this doesn’t mean eating sugar prevents BV, it does suggest that metabolic health and vaginal health are more connected than previously appreciated.
What a Realistic Treatment Plan Looks Like
For a first episode of BV, a single course of antibiotics is usually enough to clear symptoms. You’ll likely notice the fishy odor and unusual discharge improving within two to three days, though you should finish the full course. If BV returns, the conversation shifts to a longer-term strategy: a repeat course of antibiotics, possibly combined with probiotics, and a serious look at the prevention strategies above. For women with frequent recurrences, concurrent partner treatment is now on the table as a supported option.
BV is not a reflection of poor hygiene. In fact, over-cleaning is more likely to cause it than under-cleaning. The vagina is self-regulating, and the less you interfere with that system, the better it tends to function.