Bacterial vaginosis clears up with a course of prescription antibiotics, but staying clear is the harder part. More than 50% of people who complete treatment experience a recurrence within six months. Understanding why BV comes back, and what actually works to prevent it, is just as important as treating the initial infection.
How BV Is Treated
BV is caused by an overgrowth of certain bacteria that displace the healthy lactobacilli normally dominant in the vagina. The CDC recommends three first-line options: oral antibiotics taken twice daily for seven days, an antibiotic vaginal gel applied once daily for five days, or an antibiotic vaginal cream applied at bedtime for seven days. All three are prescription-only. Over-the-counter products cannot treat BV.
Most people notice the telltale fishy odor and thin grayish discharge improving within a few days of starting treatment, but you need to finish the full course even if symptoms disappear early. Stopping short leaves behind enough bacteria to regrow quickly.
Why It Keeps Coming Back
The recurrence rate for BV is notoriously high, and the main reason is biofilm. The bacteria responsible for BV, particularly Gardnerella vaginalis, form a sticky, layered colony on the vaginal lining that acts as a physical shield. Research published in Frontiers in Microbiology found that the concentration of antibiotics needed to eradicate established biofilm was far higher than what’s needed to kill free-floating bacteria. Even at the highest experimental concentrations tested, both standard antibiotics failed to fully destroy the biofilm. A small fraction of bacteria survived inside it.
This means antibiotics can knock the infection down enough to resolve your symptoms, but the biofilm quietly persists. Once conditions shift (a new menstrual cycle, unprotected sex, a change in pH), the surviving bacteria repopulate and symptoms return. The biofilm also resists the body’s own defenses, including the lactic acid and hydrogen peroxide that healthy vaginal flora produce to keep harmful bacteria in check.
Partner Treatment: A Major Shift
For years, medical guidelines said treating sexual partners offered no clear benefit. That changed in 2025 when the American College of Obstetricians and Gynecologists recommended, for the first time, concurrent treatment of male sexual partners for people with recurrent BV. The recommendation followed growing evidence that sexual activity plays a significant role in both new BV infections and recurrences.
The bacteria that cause BV can persist in the penile biofilm of male partners. Without treating the partner, reinfection during sex is common even after successful antibiotic therapy. If you’re dealing with repeated episodes, ask your provider about partner treatment with a combination of oral and topical antibiotics. This approach targets the shared bacterial reservoir rather than just treating one person in the cycle.
Probiotics and Restoring Healthy Flora
Antibiotics kill the problem bacteria, but they don’t rebuild the protective lactobacilli your vagina needs to stay balanced. That’s where probiotics may help as a complement to treatment. A randomized, placebo-controlled trial of 64 women found that taking oral capsules containing Lactobacillus rhamnosus GR-1 and Lactobacillus fermentum RC-14 daily for 60 days restored normal vaginal flora in 37% of participants with abnormal bacterial profiles, compared to just 13% in the placebo group. The probiotic group also had significantly fewer yeast and harmful bacteria colonizing the vagina at 28, 60, and even 90 days.
These strains, taken by mouth, travel through the gut and colonize the vagina. They’re available in supplement form, though quality varies widely between brands. Look for products that list specific strains (not just “Lactobacillus”) and guarantee a viable count of at least one billion organisms per capsule through the expiration date. Probiotics are not a substitute for antibiotics during an active infection, but they can support the environment that prevents the next one.
Home Remedies That Don’t Work
Search online for BV cures and you’ll find suggestions ranging from apple cider vinegar to boric acid to yogurt-soaked tampons. A 2023 review in PMC examined these popular remedies and concluded that rigorous evidence for most of them simply doesn’t exist. Attempts to shift vaginal pH using lactic acid or vitamin C supplements, for instance, showed moderate-quality evidence of no effect on BV outcomes.
Boric acid gets particular attention because some providers do use it as an adjunct for recurrent cases, but no studies have examined boric acid alone for recurrent BV, and its long-term safety in topical human use remains unexplored. It’s also classified as a pesticide. Using it without medical guidance carries real risks, including chemical burns to vaginal tissue.
Douching with any substance, whether vinegar, hydrogen peroxide, or commercial products, consistently makes BV worse. It strips away protective bacteria and disrupts the acidic environment that keeps harmful organisms from thriving.
Habits That Protect Your Vaginal pH
A healthy vagina maintains a pH between 3.8 and 4.5, acidic enough to suppress the bacteria that cause BV. Several everyday habits directly affect this balance:
- Skip internal washing. Clean your vulva with warm water only. Soap, even mild soap, doesn’t belong inside the vaginal canal.
- Avoid scented products. Scented pads, tampons, sprays, and washes alter vaginal pH. Switch to unscented versions.
- Change tampons and pads every few hours. Prolonged contact with menstrual blood (which is alkaline) raises pH and creates a friendlier environment for BV-associated bacteria.
- Change out of wet or sweaty clothing promptly. Moisture and warmth encourage bacterial overgrowth.
These habits won’t cure an active infection, but they reduce the conditions that trigger recurrence. For people who get BV repeatedly, combining antibiotic treatment, partner therapy, probiotic support, and consistent hygiene practices addresses the problem from multiple angles rather than relying on antibiotics alone each time.