Bacterial vaginosis is treated with prescription antibiotics, either taken by mouth or applied vaginally. The most commonly prescribed option is metronidazole, typically as a seven-day oral course or a five-day vaginal gel. Beyond antibiotics, several supplemental approaches can help restore vaginal balance and reduce the frustratingly high recurrence rates that make BV one of the most persistent vaginal infections.
Prescription Antibiotics
Three antibiotics are used to treat BV, and your provider will choose based on your history, preferences, and whether you’re pregnant. The CDC lists three first-line options as equally recommended: oral metronidazole (twice daily for seven days), metronidazole vaginal gel (once daily for five days), and clindamycin vaginal cream (once at bedtime for seven days).
If those don’t work or you can’t tolerate them, alternatives include oral clindamycin for seven days, clindamycin vaginal ovules for three days, or tinidazole taken orally for two to five days depending on the dose.
The choice between oral and vaginal treatment often comes down to side effects. Oral metronidazole is known for causing nausea, a metallic taste, and digestive issues. The vaginal gel avoids most of those systemic side effects but can cause local irritation, itching, or a white discharge. Some people find the convenience of a pill easier; others prefer to skip the stomach problems.
Oral vs. Vaginal: Picking a Form
One practical detail that catches people off guard: clindamycin cream contains mineral oil that weakens latex and rubber. If you use condoms or a diaphragm, you’ll need to avoid them during the entire course of treatment and for five days afterward. Clindamycin ovules carry a similar warning, extending 72 hours after your last dose. Metronidazole gel doesn’t have this issue, which makes it a better fit if barrier contraception is part of your routine.
Oral options work throughout the body, which can be an advantage if BV-related bacteria have spread beyond the vaginal canal but a disadvantage if you’re prone to yeast infections or GI side effects. Vaginal treatments deliver the antibiotic directly where it’s needed, keeping the rest of your system relatively undisturbed.
Why BV Keeps Coming Back
Recurrence is the biggest frustration with BV treatment. A study published in The Journal of Infectious Diseases tracked women after a standard course of oral metronidazole and found that 23% had a recurrence within one month. By three months, 43% had relapsed. By 12 months, 58% had experienced at least one recurrence, and 69% showed abnormal vaginal flora even if they didn’t meet the full diagnostic threshold for BV.
Those numbers explain why so many people search for additional strategies beyond antibiotics. Clearing the infection is usually straightforward. Keeping it gone is the harder problem.
Probiotics for Prevention
The vaginal environment is normally dominated by beneficial bacteria that produce lactic acid, keeping pH low and harmful bacteria in check. BV happens when that balance tips. Probiotic supplements aim to tip it back.
A randomized clinical trial tested a combination of three bacterial strains (primarily one called L. crispatus, which is the dominant species in a healthy vaginal environment) taken orally twice daily for the first week, then once daily for four months. Women who took the probiotic had significantly fewer BV recurrences and longer stretches before any relapse compared to those who didn’t.
Probiotics aren’t a replacement for antibiotics during an active infection. Their role is maintenance: helping restore the microbial community after antibiotics have done their job. Look for products that specifically contain L. crispatus rather than general “women’s health” blends, since that strain is most closely associated with vaginal health.
Vaginal Vitamin C
Specially formulated vaginal vitamin C tablets work by slowly lowering vaginal pH back to the normal range of 3.8 to 4.5. At that acidity, the anaerobic bacteria responsible for BV can’t thrive, and conditions favor the regrowth of healthy lactobacilli.
A randomized, double-blind trial found that using a 250 mg vaginal vitamin C tablet for six days per month, over six months after successful BV treatment, cut the recurrence rate roughly in half: 16.2% in the vitamin C group versus 32.4% in the placebo group. The benefit became statistically significant after about five months of consistent use, so this is a long-game strategy rather than a quick fix. These tablets are available over the counter in many countries, though the formulation matters. Standard oral vitamin C supplements should not be inserted vaginally.
Boric Acid Suppositories
Boric acid vaginal suppositories are widely available and frequently recommended in online forums, but the evidence is more limited than many people assume. Boric acid may help with resistant or recurrent vaginal infections when used alongside prescription antibiotics or antifungals. It’s generally considered an adjunct, not a standalone treatment for BV.
One important caveat: the clinical studies that do exist used boric acid suppositories made by compounding pharmacies under controlled conditions. The commercially available products sold over the counter haven’t necessarily been tested to confirm they deliver the same results. Boric acid is also toxic if swallowed, so these suppositories must be kept away from children and should never be taken orally.
Lactic Acid Gels
Lactic acid vaginal gels take a direct approach to the pH problem. Lab studies show that lactic acid doesn’t just lower pH; it actively inactivates BV-associated bacteria and has anti-inflammatory effects on vaginal tissue. Several products with varying concentrations are available, and clinical trials have compared them head-to-head with metronidazole for treating BV.
The results are mixed. Lactic acid gels show the most promise as a maintenance therapy after antibiotic treatment rather than as a primary cure. They’re generally well tolerated with minimal side effects, making them a reasonable option for people looking to support vaginal health between infections.
What to Avoid
Douching is the single most common thing people do that makes BV worse. The CDC specifically identifies douching as a factor that disrupts normal vaginal bacteria and increases BV risk. The vagina is self-cleaning, and flushing it with water, vinegar, or commercial douching products strips away the protective bacterial layer you’re trying to rebuild.
Scented soaps, bubble baths, and fragranced intimate washes can similarly irritate vaginal tissue and shift pH. Stick to plain water or a gentle, unscented cleanser on the external vulva only. New or multiple sexual partners and inconsistent condom use are also associated with higher BV rates, though BV is not classified as a sexually transmitted infection.
A Layered Approach Works Best
Given how high recurrence rates are with antibiotics alone, the most effective strategy combines prescription treatment for the active infection with one or more maintenance approaches afterward. That might look like a course of metronidazole or clindamycin to clear the current episode, followed by a daily oral probiotic containing L. crispatus for several months and periodic use of vaginal vitamin C to keep pH in the protective range. Each layer addresses a different piece of the puzzle: killing the overgrown bacteria, repopulating with beneficial ones, and maintaining the acidic environment that keeps everything in balance.