Bacterial vaginosis (BV) is treated with prescription antibiotics, and most cases clear up within a week. Over-the-counter products alone won’t reliably cure an active infection. The standard treatment is a seven-day course of oral or vaginal antibiotics, though a single-dose option also exists. The challenge with BV isn’t just clearing it once: 50 to 80 percent of women experience a recurrence within a year of finishing treatment.
Confirm It’s Actually BV
Before treating anything, it helps to know what you’re dealing with. BV and yeast infections are often confused, but they look and feel different. BV typically produces a thin, grayish, foamy discharge with a noticeable fishy smell. A yeast infection produces thick, white, odorless discharge along with itching and a white coating in and around the vagina. BV can also cause no symptoms at all, which is why some people don’t realize they have it until a routine exam picks it up.
A healthcare provider can diagnose BV quickly with a vaginal swab. The vaginal pH in BV is usually elevated above 4.5, and a sample of the discharge will show characteristic “clue cells” under a microscope. Getting the right diagnosis matters because the treatments are completely different: antibiotics for BV, antifungals for yeast.
Standard Antibiotic Treatments
The CDC recommends three first-line options, all equally effective:
- Oral metronidazole: taken twice daily for seven days
- Metronidazole vaginal gel: applied once daily for five days
- Clindamycin vaginal cream: applied at bedtime for seven days
The oral and vaginal routes work similarly well. Some people prefer the vaginal option to avoid the side effects of oral metronidazole, which can include nausea and a metallic taste. On the other hand, the vaginal creams can weaken latex condoms and diaphragms, so keep that in mind during and shortly after treatment.
If these don’t work or you can’t tolerate them, tinidazole is an alternative. It’s taken orally for two to five days depending on the dose your provider prescribes.
Single-Dose Option
A newer treatment, secnidazole, lets you take the entire course in one dose. It comes as a packet of granules that you sprinkle onto soft food like applesauce or yogurt and eat within 30 minutes. In clinical trials, a single dose of secnidazole performed comparably to a full seven-day course of metronidazole. About 50 percent of women treated with secnidazole had a complete clinical response after three to four weeks, compared to 20 percent on placebo. If sticking to a week-long regimen is difficult, this can be a practical alternative.
Why BV Keeps Coming Back
Recurrence is the single most frustrating thing about BV. Within six to twelve months of finishing antibiotics, the majority of women will have another episode. The reason lies partly in how the bacteria responsible for BV behave. The primary culprit, Gardnerella vaginalis, doesn’t just float freely in vaginal fluid. It forms a biofilm, a sticky, structured colony that adheres to the vaginal lining. Research shows these biofilms can tolerate concentrations of hydrogen peroxide and lactic acid four to eight times higher than free-floating bacteria can survive. Antibiotics knock back the infection, but the biofilm often persists, allowing the bacteria to rebound once treatment stops.
Sexual activity also plays a significant role. New evidence has shifted medical thinking on this. The American College of Obstetricians and Gynecologists (ACOG) now recommends, for the first time, considering concurrent treatment of male sexual partners when BV keeps recurring. The updated guidance calls for a combination of oral and topical antimicrobial agents for male partners of women with recurrent, symptomatic BV. Previously, partner treatment wasn’t thought to help. If your BV returns repeatedly and you have a male sexual partner, ask your provider about this approach.
What About Probiotics?
The idea behind probiotics for BV is straightforward: replenish the beneficial Lactobacillus bacteria that normally keep the vaginal environment acidic and inhospitable to BV-causing organisms. In practice, the evidence is mixed.
A clinical trial tested a well-known probiotic combination (L. rhamnosus GR-1 and L. reuteri RC-14) taken orally for 30 days alongside standard metronidazole treatment. The result: no improvement in cure rates. Women who took the probiotics had a 30-day cure rate of about 58 percent, virtually identical to the 60 percent in the antibiotics-only group. The likely explanation is that the probiotic bacteria, taken by mouth, rarely made it to the vaginal environment in meaningful numbers.
One area that does look more promising is a vaginally applied Lactobacillus crispatus product (Lactin-V), which showed meaningful reduction in BV recurrence in a phase IIb trial when used after metronidazole treatment. This isn’t widely available yet, but it points toward vaginal application being more effective than oral supplements for this purpose. Standard probiotic capsules from the drugstore are unlikely to prevent BV on their own.
Boric Acid Suppositories
Boric acid vaginal suppositories have gained popularity online, but they occupy a narrow role. They may help with resistant or recurrent infections when combined with prescription antibiotics or antifungals. They are not a first-line treatment and aren’t a substitute for antibiotics.
There are real safety concerns. Boric acid is highly toxic if swallowed; ingesting even a single suppository can be fatal. Vaginal use can cause significant irritation, potentially to the point of chemical burns. Sexual partners may also experience skin irritation from contact. Boric acid is not recommended for anyone who is pregnant or trying to become pregnant. Commercially available suppositories are also not as well studied as compounding pharmacy versions used in clinical research, so quality and dosing consistency can vary.
pH Gels and Over-the-Counter Products
Lactic acid gels marketed for “vaginal pH balance” are widely available, and small studies suggest they can lower vaginal pH and improve lab markers of vaginal health. However, a systematic review of lactic acid products for BV found a lack of high-quality evidence supporting their use for curing BV or meaningfully changing vaginal bacteria. These gels might have a role as maintenance therapy after antibiotic treatment to help prevent recurrence, but the data isn’t strong enough yet to recommend them with confidence. They won’t clear an active BV infection.
BV During Pregnancy
BV during pregnancy has been linked to a higher risk of preterm delivery (before 37 weeks), which carries serious risks for the baby including breathing problems and neurological complications. That said, it’s still unclear whether BV directly causes preterm birth or is simply associated with it. Current guidelines do not recommend screening all pregnant women for BV, but if you’re pregnant and notice symptoms like unusual discharge or a fishy odor, antibiotics are safe and available to treat the infection.
Reducing Your Risk of Recurrence
No prevention strategy is guaranteed, but several factors are known to disrupt vaginal flora and increase BV risk. Douching is the most well-established one: it strips away protective bacteria and raises vaginal pH, creating conditions where BV-causing organisms thrive. Scented soaps, washes, and sprays applied to the vaginal area can have a similar effect. The vagina is self-cleaning, and warm water on the external area is sufficient.
Using condoms consistently reduces the exchange of bacteria during sex, which matters given the growing evidence that sexual transmission plays a role in BV. If you have a recurring pattern, tracking your episodes can help your provider identify triggers, whether it’s tied to your menstrual cycle, a new partner, or a specific product. For women with frequent recurrences, some providers recommend suppressive therapy with periodic antibiotic gel to keep the infection from returning, alongside the newer option of concurrent partner treatment.