Bacterial vaginosis (BV) clears up in 5 to 7 days with antibiotic treatment, and getting that treatment started is the single most important thing you can do. BV happens when the balance of bacteria in the vagina shifts, allowing certain types to overgrow. It’s the most common vaginal infection in women of reproductive age, and while it sometimes resolves on its own, treatment prevents complications and relieves symptoms faster.
Recognizing the Symptoms
The hallmark of BV is a thin, grayish-white discharge with a noticeable fishy odor, especially after sex. Some women also experience mild itching or burning during urination. What makes BV tricky is that roughly half of women with it have no symptoms at all, which means it can go undetected unless a routine exam picks it up.
BV is not a yeast infection, even though the two get confused constantly. Yeast infections typically produce thick, white, cottage cheese-like discharge and intense itching but little odor. If you’ve been treating what you think is a yeast infection with over-the-counter antifungal creams and nothing is improving, BV is a likely explanation. A healthcare provider can confirm the diagnosis with a quick swab.
First-Line Antibiotic Treatment
The standard treatment is a course of metronidazole, taken either as oral tablets for seven days or as a vaginal gel for five days. Both approaches have comparable cure rates. A vaginal cream containing clindamycin is another option. Your provider will choose based on your preferences and medical history.
If you’d rather avoid a multi-day regimen, a single oral dose of secnidazole (2 grams) is an alternative. Clinical data shows it works about as well as the standard metronidazole course for clearing BV. The convenience of one dose can make it easier to complete treatment, which matters because skipping doses is one of the most common reasons BV lingers.
One longstanding piece of advice: avoid alcohol while taking metronidazole. The concern is a reaction that causes nausea, vomiting, and flushing. A review in the journal Antimicrobial Agents and Chemotherapy noted that this reaction occurs with “uncertain frequency and varied severity,” and the evidence behind it is weaker than most people assume. Still, it’s a short course of treatment, and skipping alcohol for a week is a reasonable precaution.
What to Expect During Recovery
Most women notice the odor and discharge improving within two to three days of starting antibiotics. Full resolution typically takes 5 to 7 days. You don’t need to avoid daily activities during treatment, but holding off on sex until you finish the full course helps the medication work effectively and reduces irritation.
If symptoms haven’t improved after completing treatment, go back to your provider. Persistent symptoms could mean the initial diagnosis was wrong, or that you need a different antibiotic. About 10 to 15 percent of women don’t respond to the first round of treatment.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of BV. Up to half of women who are treated successfully will have another episode within 12 months. For a long time, the medical community treated BV as a purely internal imbalance with no role for sexual transmission. That thinking has started to shift.
In 2025, the American College of Obstetricians and Gynecologists (ACOG) recommended for the first time that male sexual partners of women with recurrent BV be treated with a combination of oral and topical antibiotics. The rationale is that BV-associated bacteria can persist on a partner and reintroduce themselves. For women with same-sex partners who have recurrent BV, ACOG suggests a shared decision-making conversation about whether concurrent partner treatment makes sense.
This is a meaningful change. If you’ve dealt with repeated BV episodes despite doing everything right, ask your provider about partner treatment. It won’t help everyone, but it addresses a source of reinfection that was previously overlooked.
Probiotics for Prevention
Probiotics that contain Lactobacillus species, the beneficial bacteria that normally dominate a healthy vagina, have shown real promise for reducing recurrence. A meta-analysis of randomized controlled trials found that probiotics reduced the risk of BV coming back by 45% compared to placebo or standard antibiotic treatment alone.
Interestingly, the same analysis found that the route of administration didn’t seem to matter: oral probiotics and vaginal probiotics performed similarly. The total dose, number of bacterial species in the supplement, and how many days it was taken also didn’t significantly affect outcomes. This suggests that introducing Lactobacillus in any consistent form may be enough to tip the bacterial balance back in your favor.
Probiotics are not a replacement for antibiotics when you have active BV. Think of them as a strategy for after treatment, aimed at keeping BV from returning. Look for supplements that specifically contain Lactobacillus strains rather than general “women’s health” blends, and give them at least a few weeks to establish.
Lifestyle Changes That Lower Your Risk
The CDC identifies three major risk factors for disrupting vaginal bacteria: douching, having new or multiple sex partners, and not using condoms. Of these, douching is the one you can eliminate immediately and completely. Douching strips away protective Lactobacillus bacteria and creates exactly the conditions BV thrives in. The vagina is self-cleaning, and water during a normal shower is all the external hygiene you need.
Consistent condom use reduces BV risk by limiting the introduction of outside bacteria. This applies to new partners especially, but also to established relationships where BV has been a recurring problem. Scented soaps, bubble baths, and fragranced feminine products can also shift vaginal pH, so switching to unscented options is a simple, low-cost change.
BV During Pregnancy
Untreated BV during pregnancy is linked to a higher risk of preterm labor and delivery. The bacteria associated with BV have been found in amniotic fluid and placental tissue in cases of premature birth, and they’re thought to travel upward from the vagina. Women with BV have a measurably higher incidence of preterm delivery compared to women without it.
The good news is that treatment with metronidazole during pregnancy has been shown in several studies to reduce the risk of preterm delivery. Screening and treatment are generally recommended between 16 and 24 weeks of gestation for women at elevated risk. If you’re pregnant and notice the telltale discharge or odor, bring it up with your provider promptly rather than waiting for your next scheduled visit. Early treatment matters here more than in most other contexts.