Bacterial vaginosis is the most common vaginal infection, and fixing it typically requires antibiotics prescribed by a healthcare provider. The good news: a standard course of treatment clears BV in roughly 85–90% of cases. The harder truth is that recurrence is extremely common, with up to 66% of women experiencing BV again within a year. That means “fixing” BV often involves not just treating the current episode but building a longer-term strategy to keep it from coming back.
What BV Actually Is
BV isn’t caused by a single invading germ. It’s a shift in the balance of bacteria that naturally live in the vagina. Normally, beneficial bacteria called lactobacilli dominate and keep the environment slightly acidic (a pH below 4.5). When those protective bacteria lose ground and other organisms overgrow, the vaginal pH rises above 4.5, and BV develops.
The hallmark symptoms are a thin, grayish-white discharge and a fishy odor, which often becomes more noticeable after sex. Some women also experience mild itching or burning during urination. But roughly half of women with BV have no symptoms at all, which is one reason it sometimes goes undiagnosed.
First-Line Antibiotic Treatment
A provider will typically diagnose BV using a combination of clinical signs: the characteristic discharge, elevated vaginal pH, a fishy odor on a chemical test, and the presence of “clue cells” (vaginal cells coated in bacteria) visible under a microscope. At least three of these four markers need to be present for a clinical diagnosis.
Once confirmed, the standard treatment is a course of metronidazole or clindamycin. These come in oral pill or vaginal gel/cream forms, and a typical course lasts five to seven days. Both are highly effective at clearing the initial infection. Metronidazole gel applied vaginally at bedtime for five days is one of the most commonly prescribed options, and oral metronidazole tablets taken twice daily for seven days is another. Your provider will choose based on your preferences, history, and whether you’re pregnant.
Most women feel improvement within two to three days, but it’s important to finish the full course even after symptoms disappear. Stopping early increases the chance of the infection bouncing back.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of dealing with BV. More than 50% of women relapse within three to six months of successful treatment, and rates climb to 69% within 12 months. This isn’t a failure of the antibiotics. It reflects the fact that treatment kills the overgrown bacteria but doesn’t always restore a stable, lactobacillus-dominant environment.
Several factors drive recurrence. Sexual activity plays a significant role. New research has led the American College of Obstetricians and Gynecologists to recommend, for the first time, that male sexual partners of women with recurrent BV be treated with a combination of oral and topical antimicrobials. Previously, partner treatment wasn’t considered beneficial, but a growing body of evidence now shows that BV-associated bacteria can be carried and passed back during sex. For women with same-sex partners, providers may also discuss concurrent partner treatment on a case-by-case basis.
Douching is another major contributor. It strips away protective bacteria and disrupts vaginal pH, essentially creating the conditions BV thrives in. Having new or multiple sexual partners and inconsistent condom use also increase risk.
Maintenance Therapy for Recurrent BV
If BV keeps returning, your provider may suggest a longer-term suppressive approach. One well-studied protocol involves an initial 10-day course of vaginal metronidazole gel, followed by twice-weekly applications for 16 weeks. In clinical trials, this maintenance strategy kept 70% of women BV-free at the 16-week mark, compared to only 39% using a placebo. Recurrences still happen after maintenance therapy ends, but the approach buys significantly more symptom-free time.
Boric acid vaginal suppositories are another option, particularly for recurrent cases. The typical protocol is a 600 mg capsule inserted vaginally at bedtime for 14 consecutive nights. Boric acid works by lowering vaginal pH back into the acidic range where lactobacilli thrive. One important safety note: boric acid is toxic if swallowed, so it should never be taken orally and must be stored away from children.
Non-Antibiotic Approaches
For women concerned about repeated antibiotic use, some non-antibiotic alternatives are showing promise. Sucrose vaginal gel, which works by feeding and promoting the growth of lactobacilli while suppressing harmful bacteria, has performed comparably to metronidazole gel in clinical trials. One study found an 85.7% improvement rate with sucrose gel versus 88.5% with metronidazole, a difference that wasn’t statistically significant. A larger phase III trial reported an even higher cure rate for sucrose gel (80%) than metronidazole (70%). This approach essentially restores the normal vaginal flora rather than killing bacteria directly.
These alternatives aren’t yet part of standard treatment guidelines, and availability varies. But they represent a different strategy: rebuilding the vaginal ecosystem rather than wiping out problem bacteria and hoping the balance resets on its own.
Habits That Lower Your Risk
Preventing BV, or at least reducing how often it recurs, comes down to protecting the vaginal environment. The CDC identifies several key steps:
- Stop douching entirely. This is the single most impactful habit change. The vagina is self-cleaning, and douching does more harm than good.
- Use condoms consistently. Barrier protection reduces the exchange of bacteria during sex.
- Limit new sexual partners. Each new partner introduces a different bacterial profile, which can destabilize vaginal flora.
- Avoid scented products in the vaginal area. Fragranced soaps, sprays, and washes can shift pH and irritate tissue.
Wearing breathable cotton underwear and changing out of wet swimsuits or workout clothes promptly are also commonly recommended, though the evidence behind these is less robust than for the factors above.
Why Treatment Matters
BV sometimes resolves on its own, but leaving it untreated carries real risks. It increases susceptibility to sexually transmitted infections, including HIV, chlamydia, and gonorrhea, because the disrupted vaginal lining is less effective as a barrier. During pregnancy, untreated BV raises the risk of preterm birth and low birth weight. It can also lead to infections after gynecological procedures.
Even outside of these specific complications, BV significantly affects quality of life. The odor and discharge cause embarrassment and anxiety, and the cycle of treatment and recurrence takes a psychological toll. Seeking treatment isn’t just about clearing an infection. It’s about reclaiming comfort and confidence in your own body, and working with a provider who takes recurrence seriously enough to explore maintenance and partner treatment options rather than just prescribing the same short course repeatedly.