Bacterial vaginosis (BV) is treated with prescription antibiotics, either taken by mouth or applied as a vaginal gel or cream. Most cases clear up within five to seven days of starting treatment, though recurrence is common. About 58% of women experience BV again within 12 months, so understanding your full range of options matters.
First-Line Antibiotic Options
The standard treatment for BV is metronidazole or clindamycin. You’ll typically get one of these in either oral (pill) or vaginal form. A systematic review comparing oral metronidazole tablets to vaginal metronidazole gel found the clinical cure rates were essentially identical, with one large trial showing 90% cure with oral dosing and 93% with vaginal application. So neither route is clearly better. The choice usually comes down to personal preference and side effects.
Oral pills are simpler to take but come with a notable restriction: you need to avoid alcohol for at least 48 hours after finishing metronidazole, or 72 hours after finishing tinidazole, because these drugs can cause severe nausea, vomiting, and flushing when combined with alcohol. Vaginal gel avoids most of those systemic side effects but requires nightly application for five days, which some people find inconvenient.
There’s also a single-dose option called secnidazole, which comes as granules you mix into food like yogurt or applesauce and take once. In a clinical trial, it cured BV in 53% of women compared to 19% on placebo. That cure rate is lower than a full course of metronidazole, but the convenience of one dose appeals to people who struggle with multi-day regimens. Tinidazole is another alternative, taken either as a two-day or five-day course.
What Treatment Feels Like Day to Day
If you’re using vaginal metronidazole gel, you’ll insert it at bedtime using a pre-filled applicator, similar to how you’d use a yeast infection cream. Some women notice a metallic taste in their mouth even with the gel form, along with mild vaginal irritation. Oral metronidazole commonly causes nausea, a metallic taste, and sometimes headaches. Clindamycin cream is gentler on the stomach but can weaken latex condoms, so barrier protection may not be reliable during treatment.
Most people notice their symptoms, particularly the fishy odor and unusual discharge, improving within two to three days. Even so, finishing the entire course is important. Stopping early increases the chance the infection comes back.
Why BV Keeps Coming Back
Recurrence is the central frustration of BV treatment. Research tracking women after oral metronidazole therapy found that 23% had a recurrence within one month, 43% within three months, and 58% within a year. Those numbers are high, and they explain why so many people searching for BV treatment have already been through at least one round of antibiotics.
The bacteria responsible for BV form a sticky biofilm on the vaginal wall that antibiotics don’t always fully penetrate. Even when symptoms disappear, remnants of this biofilm can regrow and trigger another episode. Sexual activity plays a significant role too. The bacteria associated with BV have been found on penile skin, meaning reinfection from a partner is a real possibility, not just a theory.
Partner Treatment: A New Recommendation
For years, medical guidelines said treating male sexual partners didn’t help. That changed in 2025 when the American College of Obstetricians and Gynecologists recommended, for the first time, that clinicians consider treating male partners of women with recurrent BV. The updated guidance calls for a combination of oral and topical antibiotics for the male partner.
This shift came after growing evidence that sexual transmission plays a larger role in BV recurrence than previously understood. If your BV keeps returning, asking your provider about concurrent partner treatment is now a well-supported option.
Managing Recurrent BV
When BV returns repeatedly, your provider may suggest suppressive therapy: a longer course of vaginal metronidazole gel used once or twice a week for several months after the initial treatment clears the infection. The goal is to keep the harmful bacteria suppressed long enough for protective lactobacilli to reestablish themselves.
Boric acid vaginal suppositories are another tool for recurrent cases. A typical regimen is 600 mg inserted at bedtime for 14 consecutive days. Boric acid isn’t a first-line treatment on its own, but it’s sometimes used alongside or after antibiotics to help restore vaginal acidity. It’s available over the counter, though it’s worth discussing with your provider before starting, especially if you’re pregnant, since boric acid should never be taken orally or used during pregnancy.
Do Probiotics Help?
The idea behind probiotics for BV is straightforward: replenish the beneficial bacteria that BV displaces. Some clinical evidence supports this, though it’s modest. In a randomized trial of 64 women, those who took oral capsules containing specific lactobacillus strains daily for 60 days saw their vaginal flora shift back to normal at nearly three times the rate of women on placebo (37% versus 13%). The probiotic group also had fewer yeast and harmful bacteria colonizing the vagina at follow-up.
These results are encouraging but not dramatic. Probiotics are best thought of as a supporting strategy rather than a standalone cure. If you’re dealing with recurrent BV and want to try them, look for products containing strains specifically studied for vaginal health rather than general gut-health formulas. Taking them alongside standard antibiotic treatment, rather than instead of it, is the approach most likely to help.
BV Treatment During Pregnancy
BV during pregnancy is treated with the same core antibiotics, metronidazole or clindamycin, but the specifics of dosing and route may differ. Untreated BV in pregnancy is linked to preterm birth and low birth weight, so treatment is recommended even if symptoms are mild. Tinidazole and secnidazole are generally avoided during pregnancy due to limited safety data. Your provider will typically choose between oral metronidazole tablets or vaginal clindamycin cream based on how far along you are and your individual risk factors.