Bacterial vaginosis (BV) is treated with prescription antibiotics, either taken by mouth or applied vaginally. Most cases clear up within a week of starting treatment, but recurrence is common, which is why prevention and follow-through matter just as much as the initial prescription.
Prescription Antibiotics: The First-Line Fix
The standard treatment for BV is a course of antibiotics that target the overgrowth of harmful bacteria in the vagina. The two most commonly prescribed options are metronidazole and clindamycin. Both are available as oral pills or as vaginal gels and creams, and your provider will choose based on your symptoms, history, and preferences. A typical course runs about seven days.
For most people, symptoms like fishy odor, thin grayish discharge, and irritation start improving within two to three days of starting treatment. Finishing the full course is important even if you feel better early, because stopping short gives the harmful bacteria a chance to bounce back. Tinidazole is another oral option that works similarly to metronidazole and is sometimes used as an alternative.
One thing to know: alcohol and metronidazole don’t mix well. Drinking while on this medication (and for at least 24 hours after finishing it) can cause nausea and vomiting. Your pharmacist will flag this, but it catches people off guard.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of BV. Many people find themselves dealing with repeat infections within a few months of treatment. The bacteria that cause BV can be difficult to fully eradicate, and certain factors make reinfection more likely: new or multiple sexual partners, unprotected sex, and douching all disrupt the vaginal bacterial balance.
There’s an important shift happening in how the medical community understands recurrence. The American College of Obstetricians and Gynecologists (ACOG) now recommends, for the first time, that male sexual partners of people with recurrent BV be treated with a combination of oral and topical antibiotics at the same time. Previously, partner treatment wasn’t thought to help. New research shows that sexual activity plays a significant role in BV incidence and recurrence, and that BV-associated bacteria can persist in male partners and get passed back during sex. For same-sex partners, ACOG recommends shared decision-making about whether concurrent treatment makes sense.
For people with multiple recurrences, a longer protocol may be necessary. The CDC outlines a stepped approach: a seven-day course of oral antibiotics, followed by vaginal boric acid suppositories (600 mg daily) for 21 days, then a suppressive antibiotic gel used twice weekly for four to six months. This layered strategy aims to knock out the infection and then keep the vaginal environment stable long enough for healthy bacteria to reestablish.
Probiotics and Vaginal Flora
Healthy vaginas are dominated by Lactobacillus bacteria, which produce lactic acid and keep the pH low enough to suppress harmful organisms. BV happens when that balance tips. This is why probiotics have attracted so much interest as both a treatment add-on and a prevention strategy.
The most studied strains for vaginal health are L. rhamnosus GR-1 and L. reuteri RC-14 (previously classified as L. fermentum RC-14). In a randomized trial of 42 women, taking these two strains orally once or twice daily resulted in a healthy vaginal flora in up to 90% of participants. Among the 11 women who started the study with BV, 7 converted to normal or intermediate scores within one month. The effective dose appeared to be higher than 800 million viable organisms per capsule.
These are oral capsules, not vaginal inserts, and the bacteria travel from the gut to colonize the vaginal area. Probiotics are not a replacement for antibiotics when you have an active infection, but taking them alongside or after treatment may help tip the balance back toward a healthy microbiome and reduce recurrence risk. If you’re shopping for a probiotic, look for products that specifically list GR-1 and RC-14 strains and contain at least one billion colony-forming units.
Home Remedies: What Works and What Doesn’t
Search online and you’ll find people swearing by hydrogen peroxide douches, apple cider vinegar, tea tree oil, and garlic. The evidence for most of these ranges from thin to nonexistent, and some carry real risks.
Hydrogen peroxide has the most research behind it among home remedies. One small study found that douching with 30 ml of hydrogen peroxide daily for a week eliminated symptoms in 89% of participants. That sounds promising, but clinicians point out that this is a lot of peroxide applied to sensitive tissue for a full week, and the skin irritation potential is significant. As one provider put it, it’s probably easier and safer to use a prescription gel first and reserve hydrogen peroxide as a conversation with your provider about recurrent cases.
Apple cider vinegar baths and douches are popular but lack clinical evidence. The theory is that vinegar lowers vaginal pH, but the concentration needed to affect BV bacteria could also irritate the vulvar skin. There are no controlled trials supporting this approach.
The one home remedy doctors universally warn against is douching of any kind. Whether it’s water, vinegar, or a commercial product, douching flushes out protective Lactobacillus bacteria and is consistently linked to higher BV risk. If you currently douche, stopping is one of the most impactful things you can do.
Preventing BV in the First Place
The CDC acknowledges that scientists don’t fully understand how BV spreads or how to best prevent it, but several strategies consistently lower risk:
- Use condoms consistently. Unprotected sex is one of the strongest risk factors for disrupting vaginal bacteria. Condoms reduce the transfer of BV-associated organisms between partners.
- Limit new sexual partners. Having new or multiple partners increases exposure to unfamiliar bacteria that can shift the vaginal microbiome.
- Stop douching. This one is worth repeating. Douching washes away the protective bacteria your body needs.
- Avoid scented products near the vulva. Scented soaps, body washes, and sprays can alter vaginal pH. Warm water alone, or a mild unscented cleanser on the external area, is sufficient.
- Wear breathable underwear. Cotton or moisture-wicking fabrics help keep the area dry, which favors healthy bacteria over the anaerobic organisms behind BV.
If you’re someone who gets recurrent BV, it’s worth bringing up partner treatment with your healthcare provider, especially given the new ACOG recommendations. For many people, treating the infection in isolation without addressing the sexual transmission component has been the missing piece.