Bacterial vaginosis (BV) is treated with prescription antibiotics, typically a seven-day course that clears symptoms within a few days of starting. But getting rid of BV often means more than just finishing one round of medication. Between 50% and 80% of women experience a recurrence within a year, making prevention and follow-through just as important as the initial treatment.
How Antibiotics Clear BV
BV develops when the balance of bacteria in the vagina shifts. Protective bacteria (mainly lactobacilli) decline, and other organisms overgrow, producing the characteristic fishy odor and thin grayish discharge. Antibiotics work by killing off the overgrown bacteria so the healthy ones can reestablish themselves.
The standard treatment is a seven-day course of oral metronidazole, taken twice daily. A vaginal gel version of the same medication is also available, applied at bedtime for five nights. Clindamycin cream is another option. Most people notice symptoms improving within two to three days, though it’s important to finish the full course even after symptoms resolve. Stopping early increases the chance the infection comes back.
If you’re prescribed metronidazole, you’ll likely be told to avoid alcohol during treatment and for three days afterward. The combination can cause flushing, nausea, vomiting, and headaches in some people. The severity of this reaction is debated in the medical literature, and it may not affect everyone, but the safest approach is to skip alcohol until the medication is fully out of your system.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of BV. Within six to twelve months of finishing antibiotics, the majority of women will have at least one more episode. The reason lies partly in how the bacteria responsible for BV behave. The primary culprit, Gardnerella vaginalis, forms a biofilm on the vaginal lining. A biofilm is essentially a protective shield: a colony of bacteria embedded in a sticky matrix that antibiotics can penetrate but often can’t fully eliminate. Research shows these biofilms can tolerate four to eight times the concentration of protective acids that would kill the same bacteria floating freely. So even after a successful course of treatment, remnants of the biofilm can seed a new infection.
Sexual activity also plays a role. A growing body of evidence points to BV-associated bacteria being shared between sexual partners. For years, guidelines did not recommend treating male partners because the data wasn’t strong enough. That changed in 2025, when the American College of Obstetricians and Gynecologists recommended, for the first time, concurrent partner treatment in some cases of recurrent BV. If your BV keeps returning and you have a regular male sexual partner, this is worth discussing with your provider. Research is still limited for same-sex partners and nonmonogamous relationships.
Treatment for Recurrent BV
When BV recurs multiple times, a more aggressive treatment plan is typically needed. The CDC outlines a three-phase approach for women with repeated episodes. It starts with a standard seven-day course of oral antibiotics. That’s followed by intravaginal boric acid suppositories (600 mg) used daily for 21 days to help restore the vagina’s acidic environment. Finally, a maintenance phase of vaginal metronidazole gel applied twice weekly continues for four to six months to keep the bacteria from regrowing.
This protocol is longer and more involved than a single round of antibiotics, but it targets the problem from multiple angles: killing active bacteria, restoring the chemical environment, and suppressing regrowth over time. Boric acid on its own is not a first-line treatment, but it’s a useful tool in the maintenance phase. It lowers vaginal pH, creating conditions that favor protective lactobacilli and discourage the bacteria that cause BV.
Everyday Habits That Affect Your Risk
Certain hygiene practices directly increase BV risk by disrupting vaginal bacteria. Douching is one of the biggest contributors. Rinsing the vagina with vinegar, antiseptic solutions, or even plain water causes inflammation and strips away protective bacteria. The vagina is self-cleaning, and douching works against that process.
Heavily scented soaps and antibacterial body washes are another common trigger. These products alter the vaginal environment and can spur the growth of BV-associated bacteria. Washing the external genital area with warm water, or a mild unscented soap at most, is sufficient. The same principle applies to scented laundry detergents, dryer sheets, and any product that contacts underwear directly.
Other practical steps that help maintain a healthy bacterial balance:
- Wear breathable cotton underwear and avoid sitting in wet swimsuits or workout clothes for extended periods
- Wipe front to back after using the bathroom to avoid introducing rectal bacteria
- Use condoms consistently, which can reduce the transfer of BV-associated bacteria between partners
- Avoid scented menstrual products like pads, tampons, or sprays
Probiotics and Home Remedies
Probiotics containing lactobacillus strains are widely marketed for vaginal health, and the logic is sound: BV involves a loss of lactobacilli, so replenishing them should help. In practice, the evidence is mixed. Some studies suggest oral or vaginal probiotics may modestly reduce recurrence when used alongside antibiotics, but no specific product or strain has been proven effective enough to earn a spot in official treatment guidelines. Probiotics are generally safe to try, but they shouldn’t replace antibiotics for an active infection.
Home remedies like yogurt, tea tree oil, garlic, and apple cider vinegar appear frequently online. None of these have reliable clinical evidence supporting their use for BV. Some, like undiluted tea tree oil, can irritate vaginal tissue and make things worse. If you’re dealing with symptoms like odor, unusual discharge, or itching, getting a proper diagnosis matters because the same symptoms can indicate a yeast infection or sexually transmitted infection, each of which requires different treatment.
What to Expect During Treatment
Once you start antibiotics, the odor and discharge typically begin improving within the first few days. Most people feel substantially better by day four or five, though the full course needs to be completed. If you’re using vaginal gel or cream rather than oral pills, you may notice some mild irritation or increased discharge from the medication itself, which is normal.
After finishing treatment, there’s no routine follow-up test required if your symptoms resolve. However, if symptoms return within a few weeks or if you find yourself needing treatment more than two or three times in a year, that’s a signal to discuss a longer-term management plan with your provider, including the multi-phase approach described above and the possibility of partner treatment. BV is not dangerous for most people, but recurrent episodes are disruptive and, during pregnancy, can increase the risk of preterm birth.