Bacterial vaginosis (BV) is cured with prescription antibiotics, typically a 5- to 7-day course taken orally or applied as a vaginal gel or cream. The standard treatment clears the infection in most people, but BV has a frustratingly high recurrence rate, with roughly half of those treated experiencing a return of symptoms within 12 months. Understanding both the initial treatment and what to do if it keeps coming back is key to getting lasting relief.
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. Normally, beneficial bacteria (primarily Lactobacillus species) keep the vaginal environment slightly acidic, which holds other microbes in check. When those protective bacteria lose ground, a mix of other organisms overgrows, raising the vaginal pH and producing the hallmark symptoms: a thin grayish-white discharge, a strong fishy odor (especially after sex), and sometimes mild itching or burning.
BV is the most common vaginal condition in women of reproductive age. It can resolve on its own in some cases, but treatment is recommended because untreated BV raises your chances of acquiring STIs like chlamydia and gonorrhea. Those infections, in turn, can lead to pelvic inflammatory disease, which can affect fertility.
First-Line Antibiotic Treatment
Two antibiotics are the go-to options for BV. Your provider will prescribe one based on your history, preferences, and whether you’re pregnant.
- Metronidazole: Available as an oral pill (taken twice daily for 7 days) or as a vaginal gel (applied once daily for 5 days). The oral version is slightly more convenient but can cause nausea, and you need to avoid alcohol during treatment and for at least 24 hours after finishing, because the combination causes severe nausea and vomiting.
- Clindamycin: Usually prescribed as a vaginal cream applied at bedtime for 7 days. An oral version exists but is used less often. One thing to know: oil-based clindamycin cream can weaken latex condoms for up to 5 days after your last dose.
Both options have similar cure rates for a first episode. Most people notice the odor and discharge improving within two to three days, though you should finish the full course even if symptoms clear early. Stopping antibiotics partway through increases the chance of the infection bouncing back.
Why BV Keeps Coming Back
Recurrence is the single most frustrating thing about BV. The antibiotics work well at knocking down the overgrown bacteria, but they don’t always restore a healthy Lactobacillus population afterward. Without that protective bacterial layer re-establishing itself, the same imbalance can creep back within weeks or months.
Several factors make recurrence more likely. Semen is alkaline, so unprotected sex raises vaginal pH and can tip the balance toward BV-associated bacteria. Having a new sexual partner or multiple partners also increases risk. Douching, whether with water, vinegar, or antiseptic products, strips away beneficial bacteria and causes inflammation that invites the imbalance back. Even tight, non-breathable clothing like nylon underwear or snug yoga pants can trap moisture and encourage bacterial overgrowth.
There’s also growing evidence that male sexual partners may harbor BV-associated bacteria under the foreskin or in the urethra, essentially passing the same organisms back and forth. Research into whether treating male partners reduces recurrence is ongoing, and some early trials have shown promising results, but concurrent partner treatment isn’t yet part of standard guidelines.
Treatment for Recurring BV
If BV returns multiple times after standard treatment, your provider will likely recommend a longer, multi-step approach rather than simply repeating the same short course.
One well-studied protocol starts with a full 7-day course of oral antibiotics, followed by 21 days of vaginal boric acid suppositories (600 mg daily). After that, you transition to a maintenance phase of vaginal metronidazole gel applied twice a week for four to six months. The CDC lists this regimen as an option for women with multiple recurrences. The goal of the extended maintenance phase is to keep BV-associated bacteria suppressed long enough for protective bacteria to re-colonize.
A simpler maintenance option involves using vaginal metronidazole gel or suppositories twice weekly for three months or longer after the initial treatment clears symptoms. This does reduce recurrences while you’re using it, but the benefit tends to fade once you stop. That’s why the longer, multi-step protocols exist: they buy your vaginal microbiome more time to stabilize.
The Role of Boric Acid
Boric acid vaginal suppositories have become popular as both a standalone remedy and a complement to antibiotics. They work by lowering vaginal pH, creating an environment that’s less hospitable to BV-associated bacteria and more favorable for Lactobacillus. In the CDC’s multi-step recurrence protocol, boric acid serves as a bridge between the initial antibiotic course and the longer maintenance phase.
Boric acid is not a replacement for antibiotics in an active BV infection. It’s most useful as a follow-up step or for managing mild symptoms between episodes. The suppositories are inserted vaginally, never taken orally, as boric acid is toxic if swallowed. They’re available over the counter, but if you’re dealing with recurrent BV, using them as part of a structured plan with your provider will give you better results than self-treating randomly.
Do Probiotics Help?
The logic behind probiotics for BV is straightforward: if the problem is too few protective bacteria, adding them back should help. In practice, the evidence is mixed but slowly improving. Certain Lactobacillus strains, particularly L. crispatus (the dominant species in a healthy vaginal microbiome), have shown the most promise. Vaginal probiotic suppositories deliver these bacteria directly where they’re needed, which is more targeted than oral probiotics that have to survive the digestive tract first.
Clinical trials are actively testing specific probiotic formulations, including multi-strain vaginal suppositories combining L. crispatus with other Lactobacillus species. The results so far suggest probiotics may help maintain a healthy pH and support recovery after antibiotic treatment, but they aren’t reliable enough on their own to cure an active case of BV. Think of them as a potential add-on, not a substitute for antibiotics.
Lifestyle Changes That Lower Your Risk
What you do between treatments matters as much as the treatment itself, especially if you’re prone to recurrence.
- Stop douching entirely. This is the single most impactful change. Douching disrupts the vaginal microbiome and increases infection risk regardless of what solution you use. The vagina is self-cleaning; warm water on the external area during a shower is all you need.
- Use condoms. Barrier protection keeps semen (which raises vaginal pH) from shifting your bacterial balance. This is especially relevant if you notice BV flaring after unprotected sex.
- Choose breathable underwear. Cotton underwear allows airflow and reduces the warm, moist conditions that encourage bacterial overgrowth. Save the nylon and tight leggings for shorter wear when possible.
- Pay attention to diet. A diet that supports gut health also influences vaginal flora. Poor nutrition weakens your body’s ability to restore normal bacterial balance after disruption.
- Avoid scented products near the vagina. Scented soaps, sprays, bubble baths, and laundry detergents on underwear can all irritate vaginal tissue and disturb pH.
What to Expect From Treatment
For a first or occasional episode, a single course of antibiotics clears BV for most people within a week. You’ll typically notice the smell fading within the first couple of days, with discharge returning to normal by the end of treatment. If symptoms haven’t improved after finishing the full course, your provider may switch you to the other antibiotic option or investigate whether something else is causing your symptoms, since yeast infections and trichomoniasis can look similar.
For recurrent BV, expect a longer timeline. The multi-step protocols span several months, and the maintenance phase requires consistent twice-weekly application of vaginal gel. It’s a commitment, but for people who’ve been caught in cycles of infection and re-infection, these extended approaches offer the best shot at breaking the pattern and giving healthy bacteria a chance to take hold again.