Bacterial vaginosis (BV) is treated with prescription antibiotics, either taken by mouth or applied vaginally. Most cases clear up within a week of starting treatment, but the condition has one of the highest recurrence rates of any vaginal infection: 50% to 80% of women experience it again within 6 to 12 months. That makes understanding both the initial treatment and the longer game of prevention essential.
Why BV Keeps Coming Back
BV happens when the protective bacteria in the vagina, mostly Lactobacillus species, get outnumbered by a mix of other organisms. The dominant one is Gardnerella vaginalis, but it rarely works alone. It teams up with species like Prevotella bivia and Peptostreptococcus anaerobius to form what researchers call a biofilm: a sticky, layered colony of bacteria that coats the vaginal wall and shields itself with a protective outer matrix.
This biofilm is the central reason BV is so stubborn. Antibiotics can kill the free-floating bacteria and reduce symptoms, but they often fail to fully penetrate and destroy the biofilm structure. Once treatment stops, the surviving bacteria regrow from that scaffolding. All four of the major BV-associated pathogens have shown increasing resistance to conventional antibiotics, which compounds the problem further.
First-Line Antibiotic Treatments
The CDC recommends metronidazole or clindamycin as the primary treatments. You’ll typically be offered one of these options:
- Oral metronidazole: taken twice daily for 7 days
- Vaginal metronidazole gel (0.75%): applied once daily for 5 days
- Vaginal clindamycin cream (2%): applied at bedtime for 7 days
All three have similar cure rates for a first episode. The oral pill works throughout the body, while the gels and creams target the vagina directly with fewer side effects like nausea. The trade-off is that vaginal creams can weaken latex condoms and diaphragms during treatment and for several days after.
If those don’t work or you need something more convenient, alternatives exist. Secnidazole is a single-dose oral treatment, just one packet of granules mixed into food. In clinical trials, it achieved a cure rate of about 53% at the one-month mark, compared to 19% for a placebo. Tinidazole is another option, taken once daily for 2 to 5 days depending on the dose your provider prescribes.
Managing Recurrent BV
If BV keeps returning, the approach shifts from a single course of antibiotics to a longer, layered strategy. One protocol supported by clinical data involves three phases: a 7-day course of oral antibiotics, followed by 21 days of vaginal boric acid suppositories (600 mg nightly), followed by months of twice-weekly vaginal metronidazole gel as a maintenance step. This staggered approach aims to first knock down the infection, then disrupt the biofilm’s ability to reform, and finally suppress regrowth over the long term.
In a significant shift, the American College of Obstetricians and Gynecologists (ACOG) in 2025 recommended for the first time that male sexual partners of women with recurrent BV also receive treatment. Growing evidence shows that sexual activity plays a direct role in BV recurrence, and the bacteria responsible can be carried on penile skin. The recommendation calls for a combination of oral and topical antimicrobials for male partners. Previously, data hadn’t clearly supported this approach, but newer research changed the calculus. If you’re in a sexual relationship and dealing with recurrent BV, this is worth discussing with your provider.
Do Probiotics Help?
Probiotics are one of the most commonly searched remedies for BV, and there is real evidence behind them, though the picture is nuanced. A meta-analysis of randomized controlled trials found that probiotics reduced the risk of BV recurrence by 45% compared to placebo or standard antibiotics alone. The benefit was strongest when probiotics were taken alongside antibiotic treatment rather than as a replacement for it.
The strain that shows up most often in positive results is Lacticaseibacillus rhamnosus, and oral supplements appear to work better than vaginal ones based on current reviews. A dosage of at least 100 million CFU taken for a minimum of two months seems to be the threshold for meaningful results, based on the research so far. Probiotics won’t reliably cure an active infection on their own, but they may help restore the protective Lactobacillus population that keeps BV from returning.
Home Remedies: What Works and What Doesn’t
Apple cider vinegar is one of the most popular home remedies for BV. The theory makes surface-level sense: its acetic acid could lower vaginal pH, which might discourage harmful bacteria. But no studies have actually tested apple cider vinegar directly on BV. Researchers who’ve looked at the mechanism note that simply lowering pH may not be enough to manage an established infection, especially one protected by a biofilm.
Tea tree oil is another common suggestion. There is no scientific evidence that it helps with BV. It can cause allergic reactions and is not considered safe during pregnancy. Douching with any product, including vinegar solutions, antiseptics, or fragranced washes, disrupts the natural vaginal flora and makes BV more likely rather than less. Drugstore douches typically contain antiseptics and fragrances that actively shift the bacterial balance in the wrong direction.
Reducing Your Risk Going Forward
Because BV is fundamentally about bacterial balance rather than a single invading germ, prevention focuses on protecting the vaginal environment. Avoiding douching is the single most impactful change if you currently do it. Beyond that, a few practical habits lower risk:
- Skip fragranced products near the vagina. Soaps, sprays, bubble baths, and scented tampons or pads can all irritate vaginal tissue and shift the microbial balance.
- Check lubricant ingredients. Glycerin, a common ingredient in many personal lubricants, can promote the growth of unwanted bacteria. Glycerin-free options are widely available.
- Use condoms consistently. Barrier methods reduce the exchange of bacteria during sex, which is now firmly established as a factor in BV incidence and recurrence.
- Consider partner treatment. If BV keeps recurring and you have a regular male sexual partner, concurrent treatment for both of you may break the cycle of reinfection.
BV is not a reflection of poor hygiene. In fact, aggressive cleaning is one of its triggers. The vagina is self-cleaning, and the less you interfere with that process, the more stable its protective bacterial community remains.