Bacterial vaginosis (BV) is treated with prescription antibiotics, either taken by mouth or applied as a vaginal cream or gel. Most cases clear up within a week of treatment, but roughly half of women experience a recurrence within 3 to 12 months. Getting rid of BV for good often requires understanding why it comes back and making a few changes beyond just finishing your prescription.
What BV Actually Is
BV isn’t a traditional infection caused by a single invading germ. It’s a shift in the balance of bacteria that naturally live in the vagina. A healthy vagina is dominated by lactobacilli, bacteria that produce lactic acid and keep the environment slightly acidic, with a pH below 4.5. When lactobacilli lose their foothold, other bacteria multiply and take over. The hallmark signs are a thin grayish-white discharge and a fishy odor, particularly after sex. Some women have no symptoms at all.
About 94% of women diagnosed with BV have a vaginal pH above 4.5. That elevated pH is both a marker of the imbalance and part of what sustains it, since the bacteria driving BV thrive in a less acidic environment.
Prescription Antibiotics: The First Step
The standard first-line treatment is metronidazole, available as an oral pill or a vaginal gel. Clindamycin is another option, offered as an oral pill, a vaginal cream, or vaginal suppositories. Both are typically used for about seven days, though some formulations work in shorter courses. A single-dose vaginal gel is also available for each.
For women who prefer a one-and-done approach, a single-dose oral medication called secnidazole exists. In clinical trials, it produced a cure rate of about 53% at the one-month mark, compared to 19% for a placebo. It costs more than the standard options and doesn’t have the same long-term track record, which is why most guidelines list it as an alternative rather than a first choice.
Whichever antibiotic you’re prescribed, finishing the full course matters. Stopping early because symptoms improve leaves behind bacteria that are more likely to regroup.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of BV. The main culprit is biofilm, a protective shield that the primary BV-associated bacteria build on the vaginal lining. Think of it like plaque on teeth: bacteria cluster together and surround themselves with a sticky matrix that antibiotics have a hard time penetrating. Even when a course of metronidazole kills off free-floating bacteria and symptoms disappear, the biofilm can survive largely intact. The bacteria inside it then regrow, and symptoms return weeks or months later.
This biofilm isn’t just one species. Multiple types of bacteria coexist within it, forming a layered, cooperative community that is especially difficult to eradicate. The physical structure of the biofilm slows down the delivery of antibiotic molecules to the bacteria hiding inside, which is one reason standard treatment often fails to clear BV permanently.
Partner Treatment: A Shift in Thinking
For years, treating male sexual partners wasn’t recommended because the evidence wasn’t convincing. That has changed. In 2025, ACOG (the leading professional body for OB-GYNs in the U.S.) recommended for the first time that concurrent treatment of male sexual partners be considered for women with recurrent BV. The updated guidance calls for a combination of oral and topical antibiotics for the male partner.
The logic is straightforward: BV-associated bacteria can live under the foreskin and along the penile skin. During sex, those bacteria are reintroduced into the vagina, essentially reseeding the imbalance that antibiotics just cleared. If your BV keeps returning and you have a regular male sexual partner, this is a conversation worth having with your provider. It represents a meaningful shift in how recurrent BV is managed.
Habits That Raise or Lower Your Risk
Douching is one of the strongest modifiable risk factors. Women who douched within the previous two months were nearly three times more likely to have BV, according to a large study published in the American Journal of Public Health. Douching washes away protective lactobacilli and disrupts vaginal pH, creating exactly the conditions BV bacteria need. If you currently douche, stopping is one of the simplest things you can do to reduce recurrence.
Other habits that help protect the vaginal environment:
- Avoid scented products in or near the vagina. Scented soaps, sprays, and bubble baths can shift pH upward, favoring BV-associated bacteria. Warm water alone is sufficient for external cleaning.
- Wear breathable underwear. Cotton or moisture-wicking fabrics reduce trapped moisture, which can encourage bacterial overgrowth.
- Use condoms consistently. Semen is alkaline (pH around 7 to 8), and exposure during unprotected sex temporarily raises vaginal pH. Condom use reduces this effect and limits the exchange of BV-associated bacteria between partners.
Probiotics and Home Remedies
You’ll find no shortage of suggestions online for treating BV with yogurt, boric acid suppositories, or probiotic supplements. The evidence is mixed. Some studies on vaginal probiotic suppositories containing specific lactobacillus strains show modest benefit in preventing recurrence when used alongside antibiotics, but no probiotic has been proven to cure an active case of BV on its own.
Boric acid vaginal suppositories are sometimes recommended by providers as an add-on for recurrent BV, particularly to help restore vaginal acidity after antibiotic treatment. They are not a substitute for antibiotics and should not be taken orally, as boric acid is toxic when swallowed. If you’re interested in trying boric acid, bring it up with your provider so you can use it safely and at the right point in your treatment.
What to Expect During Treatment
Most women notice the odor and discharge improving within two to three days of starting antibiotics. That doesn’t mean the bacteria are fully cleared. Complete the full course regardless of how quickly you feel better. Avoid alcohol during metronidazole treatment and for at least 24 hours after finishing it, since the combination can cause nausea, vomiting, and flushing.
If you’re using a vaginal cream or gel, oil-based formulations can weaken latex condoms and diaphragms. Check the product labeling and use an alternative form of contraception during treatment and for a few days afterward.
For a first episode that responds to treatment and doesn’t return, no follow-up testing is usually needed. For recurrent BV (three or more episodes in a year), providers may recommend a longer or stepped-down antibiotic course, sometimes involving weeks of intermittent vaginal gel to suppress the biofilm and give lactobacilli time to reestablish. Combining this suppressive approach with partner treatment and lifestyle adjustments gives you the best shot at breaking the cycle.