Bacterial vaginosis is treated with prescription antibiotics, either taken by mouth or applied vaginally. Both routes work about equally well, with cure rates around 70–90% depending on the formulation. Most cases clear within a week of starting treatment, though recurrence is common, with roughly half of women experiencing BV again within 12 months.
Antibiotics: Oral vs. Vaginal
The two main antibiotics used for BV are metronidazole and clindamycin. You can take metronidazole as a pill (twice daily for seven days) or use it as a vaginal gel for five days. Clindamycin is available as a vaginal cream, typically used at bedtime for seven days. Your provider will help you choose based on your preferences and health history.
A clinical trial comparing the two delivery methods found that vaginal metronidazole produced a cure rate of about 92.5%, while oral metronidazole came in at roughly 90%. The practical difference is minimal, but the vaginal route tends to cause fewer side effects like nausea, metallic taste, and stomach upset. If you’ve had trouble tolerating oral antibiotics in the past, the gel or cream version is worth asking about.
One important rule if you’re prescribed oral metronidazole: avoid alcohol during your entire course of treatment and for at least 24 to 48 hours afterward. Combining the two can cause severe nausea, vomiting, and flushing.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of BV. Up to half of women who are successfully treated see symptoms return within a year. The main reason is biofilm: the bacteria responsible for BV form a protective layer on the vaginal wall that antibiotics struggle to fully penetrate. Treatment kills the free-floating bacteria and improves symptoms, but the biofilm can regrow and restart the cycle.
For women dealing with repeated episodes, providers sometimes recommend suppressive therapy, a longer course of medication designed to keep bacteria levels low after the initial treatment clears the active infection. This often means using vaginal metronidazole gel periodically (such as twice a week) for several months.
Treating Male Partners May Help
For years, the standard advice was that male sexual partners didn’t need treatment. A landmark randomized controlled trial published in the New England Journal of Medicine in 2025 changed that picture significantly. Women whose male partners received concurrent antibiotic treatment had a recurrence rate of 35%, compared to 63% in the group where partners went untreated. That’s nearly half the risk of BV coming back.
The effect was strongest when male partners fully completed their treatment course, dropping the recurrence rate even further. These findings support the idea that BV-associated bacteria can persist on a male partner’s genitals and get passed back during sex. If you’re in a regular sexual partnership and struggling with recurrent BV, this is a conversation worth having with your provider. The California Department of Public Health has already issued clinical recommendations supporting male partner treatment to prevent recurrence.
Boric Acid Suppositories
Boric acid vaginal suppositories are widely used by women managing persistent BV, though they are not FDA-approved for this purpose. Boric acid works by lowering vaginal pH and disrupting the environment that BV-causing bacteria prefer. In lab settings, it can inhibit new biofilm formation, though it’s less effective at destroying biofilms that already exist.
When used alongside antibiotics, boric acid shows promise. One study of 105 women with recurrent BV found that combining boric acid with standard antibiotic therapy resulted in a 69% cure rate at six months. Used on its own, a randomized trial of a boric acid-based formulation showed 50–59% efficacy in early clinical cure. The evidence is still limited, and no studies have examined boric acid alone for recurrent BV in a rigorous way. It’s best thought of as a complement to antibiotics rather than a replacement.
Probiotics and Vaginal Flora
A healthy vagina is dominated by Lactobacillus bacteria, which produce lactic acid and keep the pH low enough to suppress BV-causing organisms. BV is essentially a disruption of that balance. Restoring it after antibiotic treatment is the logic behind probiotic use.
Two specific probiotic strains, originally isolated from the female urogenital tract, have been studied for this purpose. A randomized, placebo-controlled trial in 64 healthy women showed that taking oral capsules containing these strains (at a concentration of over one billion organisms per strain) significantly shifted vaginal flora in a favorable direction. The bacteria colonized the vagina even though they were taken by mouth, which means you don’t necessarily need a vaginal probiotic to see an effect. Look for products that contain strains specifically researched for vaginal health rather than general gut-health formulations. Probiotics are not a standalone treatment for active BV, but they may help maintain balance after antibiotics do the heavy lifting.
BV During Pregnancy
Untreated BV during pregnancy is associated with preterm birth, low birth weight, and premature rupture of membranes. If you’re pregnant and diagnosed with BV, treatment is recommended regardless of whether you have symptoms. Oral metronidazole is considered safe during pregnancy and is the most commonly prescribed option. Your OB provider may screen for BV early in pregnancy if you have a history of preterm delivery.
What to Do If Treatment Doesn’t Work
If your symptoms return quickly or never fully resolve, there are a few things to consider. First, make sure the diagnosis is correct. BV symptoms overlap with yeast infections and other vaginal conditions, and treating the wrong one won’t help. Second, biofilm persistence is a real barrier to cure. Switching between antibiotic types or combining antibiotics with a biofilm-disrupting agent like boric acid may improve results.
Third, consider the partner treatment data. If reinfection from a sexual partner is driving recurrence, antibiotics alone on your end won’t break the cycle. Finally, certain habits can shift vaginal pH in the wrong direction: douching, scented soaps in the genital area, and frequent use of certain lubricants. Eliminating these while undergoing treatment gives your vaginal flora the best chance of recovering on its own.