Bacterial vaginosis (BV) is curable with antibiotics, and most cases clear up within five to seven days of treatment. The challenge isn’t the initial cure. It’s keeping BV from coming back, which happens in more than half of women within several months. Understanding both the treatment and the prevention side gives you the best shot at getting rid of BV for good.
What BV Is and How to Recognize It
BV happens when the balance of bacteria in the vagina shifts. Normally, beneficial bacteria called lactobacilli dominate the vaginal environment, keeping it slightly acidic. When other types of bacteria overgrow, that balance tips, and the vaginal pH rises above 4.5. This isn’t a classic infection you “catch” from somewhere. It’s a disruption of an ecosystem that was already there.
The most common signs are a thin, grayish discharge that’s heavier than usual and a noticeable fishy odor, especially after your period or after sex. Some women have no symptoms at all. BV is often confused with a yeast infection, but the two feel quite different. A yeast infection produces thick, cottage cheese-like discharge and intense itching, while BV discharge is thinner and the hallmark symptom is odor rather than itch. Getting the right diagnosis matters because the treatments are completely different.
To diagnose BV, a clinician checks for at least three of four signs: the characteristic thin discharge, vaginal cells coated with bacteria visible under a microscope (called clue cells), a pH above 4.5, and a fishy smell. A simple office visit or telehealth appointment is usually enough to confirm it.
Antibiotic Treatment Options
The standard treatment for BV is a course of antibiotics, either taken by mouth or applied as a vaginal gel or cream. The two most commonly prescribed options are metronidazole and clindamycin. Metronidazole is available as an oral pill taken twice daily for seven days or as a vaginal gel used once daily for five days. Clindamycin comes as a vaginal cream applied at bedtime for seven days. Both are highly effective at clearing the initial infection.
For women who prefer a faster option, single-dose oral treatments exist. These work by delivering a higher concentration of medication all at once, which can be more convenient but may cause more digestive side effects. Your provider can help you weigh the trade-offs based on your history and preferences.
If you’re prescribed metronidazole in pill form, avoid alcohol during treatment and for at least 24 hours after finishing. The combination can cause nausea, vomiting, and flushing. Clindamycin cream is oil-based, which means it can weaken latex condoms and diaphragms for up to five days after use.
Why BV Keeps Coming Back
Recurrence is the biggest frustration with BV. Even after successful antibiotic treatment, the bacteria that caused the overgrowth can persist in a protective layer called a biofilm on the vaginal walls. Antibiotics kill the free-floating bacteria effectively, but this biofilm acts like a shield, allowing colonies to rebuild once treatment stops.
Sexual activity plays a larger role than many people realize. Semen and menstrual blood both have a higher pH than the vagina, and when that balance gets disrupted repeatedly, BV can flare up again. A landmark study published in March 2025 tested what happened when male sexual partners of women with BV were also treated with antibiotics. Among couples where partners received treatment, only 35% of women saw their BV return. In the group where only the woman was treated, BV came back 63% of the time. That’s a dramatic difference, and it supports the idea that BV behaves, at least partly, like a sexually transmitted condition.
Preventing Recurrence
Based on current evidence, the most impactful steps you can take to prevent BV from returning focus on the vaginal environment and sexual health practices rather than general lifestyle changes. Research from the Cleveland Clinic notes that advice about changing your diet or underwear, while reasonable for general hygiene, doesn’t appear to make a meaningful difference for BV specifically. That said, several strategies do help.
- Condom use: If you’re sensitive to shifts in vaginal bacteria, consistent condom use can reduce exposure to semen, which raises vaginal pH and can trigger recurrence.
- Partner treatment: Ask your provider about treating your male partner as well. The evidence for this approach is strong and growing.
- Avoid douching: Douching strips away protective bacteria and is one of the clearest risk factors for developing BV in the first place.
- Suppressive therapy: For women with frequent recurrences, providers sometimes prescribe a longer course of vaginal antibiotics, used once or twice a week for several months, to keep the bacteria from regaining a foothold while the vaginal flora reestablishes itself.
Probiotics and Boric Acid
Many women search for ways to treat or prevent BV without antibiotics, and two options come up repeatedly: probiotics and boric acid. Neither is a replacement for antibiotics when you have active symptoms, but both show some promise as supporting tools.
Probiotics containing lactobacillus strains, delivered as vaginal tablets, have shown encouraging results in clinical trials. In one study, women who used lactobacillus vaginal tablets daily for seven days had significantly better outcomes than those given a placebo. All 18 women in the treatment group were free of BV after finishing the course, with 83% showing fully normal vaginal flora. Two weeks later, 61% of the probiotic group still had a healthy balance compared to just 19% of the placebo group. Oral probiotic supplements are also widely available, though the evidence is stronger for vaginal delivery, which places the bacteria directly where they’re needed.
Boric acid vaginal suppositories are another common approach, particularly for recurrent BV. Boric acid works by lowering vaginal pH and disrupting the biofilms that help harmful bacteria survive between antibiotic courses. It is not FDA-approved for this use, but it has moderate-quality evidence supporting its benefit. The typical approach involves inserting a gelatin capsule vaginally, often after completing a round of antibiotics, as a maintenance strategy. Boric acid should never be taken orally, as it is toxic when swallowed.
BV During Pregnancy
BV during pregnancy deserves extra attention because it’s linked to a higher risk of preterm birth and low birth weight. If you’re pregnant and experiencing symptoms, treatment is recommended even for mild cases. Oral antibiotics are generally preferred during pregnancy so the medication reaches bacteria that may be present higher in the reproductive tract. Your OB-GYN will choose the safest option for your stage of pregnancy.
Screening for BV in pregnant women without symptoms is not routinely recommended for everyone, but if you have a history of preterm delivery, it’s worth discussing with your provider.
What a Realistic Timeline Looks Like
Most women notice improvement within two to three days of starting antibiotics, and symptoms typically resolve completely by the end of a five-to-seven-day course. If your symptoms don’t improve, or if they return within a few weeks, your provider may try a different antibiotic or a longer treatment course. For women with recurrent BV (three or more episodes in a year), a combined approach using antibiotics, suppressive therapy, and biofilm-disrupting agents like boric acid tends to produce the best long-term results.
BV is not dangerous in most cases, but left untreated it can increase susceptibility to sexually transmitted infections and cause persistent discomfort. Getting it properly diagnosed and treated, rather than self-treating based on symptoms alone, makes a real difference in how quickly and completely it resolves.