Bacterial vaginosis (BV) is treated with prescription antibiotics, either taken by mouth or applied inside the vagina. Most cases clear up within five to seven days of treatment. BV is the most common vaginal infection in women of reproductive age, and while it sometimes resolves on its own, treatment is recommended for anyone with symptoms because untreated BV can increase susceptibility to other infections.
How BV Is Diagnosed
BV produces a thin, grayish-white vaginal discharge with a noticeable fishy smell. The odor often becomes stronger after sex. To confirm the diagnosis, clinicians look for at least three of four signs: that characteristic discharge, a vaginal pH above 4.5 (healthy vaginal pH sits below that), a fishy odor when a chemical solution is applied to a sample, and the presence of “clue cells” under a microscope, which are vaginal cells coated in bacteria. If you recognize these symptoms, a quick office visit or telehealth appointment can get you a diagnosis and prescription the same day.
Standard Antibiotic Treatment
Three regimens are considered first-line options by the CDC:
- Oral metronidazole: 500 mg taken twice daily for 7 days
- Metronidazole vaginal gel (0.75%): one applicator inserted once daily for 5 days
- Clindamycin vaginal cream (2%): one applicator inserted at bedtime for 7 days
If these don’t work or aren’t tolerated, alternatives include oral clindamycin (taken twice daily for 7 days) or clindamycin vaginal ovules used at bedtime for 3 days. All of these options have similar effectiveness, so the choice often comes down to whether you prefer a pill or a topical treatment and how you respond to side effects.
There is also a single-dose option: secnidazole, a granule packet mixed into food and taken once. It’s convenient, but the clinical response rate is more modest. In trials of 352 women, about 50% had a full clinical response after a single dose compared to 20% on placebo. It works best for people who struggle to complete a multi-day course.
What to Know While on Treatment
If you’re taking metronidazole in any form, you need to avoid alcohol completely during treatment and for at least 3 days after your last dose. Combining the two can trigger nausea, vomiting, flushing, and a rapid heartbeat. This also applies to products containing propylene glycol, which shows up in some foods and medications.
Clindamycin cream and ovules are oil-based, which means they can weaken latex condoms and diaphragms. If you’re using barrier contraception, you’ll need a backup method during treatment and for a few days afterward. Most people tolerate both antibiotics well, though metronidazole can cause a metallic taste and mild nausea, and vaginal treatments occasionally cause local irritation.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of BV. Up to 66% of women experience a recurrence within a year of their initial treatment. The bacteria that cause BV form a sticky biofilm on vaginal walls that antibiotics can suppress but not always fully eliminate. Once treatment ends, the surviving bacteria can regrow and tip the balance again.
Sexual activity plays a significant role. BV-associated bacteria have been found in the genital tract of male partners, creating a cycle where bacteria pass back and forth. For years, guidelines said treating partners didn’t help. That changed in 2025, when the American College of Obstetricians and Gynecologists recommended for the first time that male sexual partners of women with recurrent BV be treated with a combination of oral and topical antibiotics. For same-sex partners and first-time BV cases, partner treatment is a shared decision between the patient and clinician rather than a blanket recommendation.
Treatment During Pregnancy
Symptomatic BV during pregnancy should be treated because it’s associated with premature rupture of membranes, preterm birth, infection of the amniotic fluid, and postpartum uterine infection. Pregnant women can use any of the standard regimens listed above, plus oral clindamycin and clindamycin ovules as alternatives.
A few medications should be avoided. Tinidazole is not safe during pregnancy. Secnidazole and certain newer vaginal formulations lack sufficient safety data and should also be skipped. If you’re pregnant and suspect BV, getting a prompt diagnosis matters because the risks of leaving it untreated are concrete and well documented.
Boric Acid and Probiotics
Boric acid vaginal suppositories are widely used as an add-on therapy, particularly for recurrent BV. A typical regimen involves a daily “induction” phase of 600 mg suppositories for 7 to 14 days, followed by maintenance use two to three times per week. Patient satisfaction is high, with about 77% of users reporting they were pleased with the regimen. However, there are no rigorous published trials measuring how well boric acid actually prevents BV recurrence. It’s a promising option, but one supported more by clinical experience than by hard data. Boric acid is toxic if swallowed and should only be used vaginally.
Probiotics containing Lactobacillus strains, particularly L. rhamnosus GR-1 and L. reuteri RC-14, have shown some benefit when combined with antibiotics. One trial of 125 women found that taking oral probiotics alongside metronidazole improved BV cure rates compared to antibiotics alone. Another trial found that probiotics improved vaginal bacterial composition even when they didn’t boost the overall cure rate. Probiotics are unlikely to treat an active BV infection on their own, but they may help restore the vaginal environment after antibiotics do the heavy lifting.
Habits That Protect Vaginal Balance
The vagina maintains its own ecosystem, dominated by Lactobacillus bacteria that produce lactic acid and keep the pH low enough to suppress harmful organisms. Anything that disrupts this balance raises BV risk.
Douching is the single biggest modifiable risk factor. It kills the protective Lactobacillus bacteria while allowing harmful species to flourish, and women who douche to treat BV symptoms actually make the problem worse. Common douching agents like vinegar, baking soda, herbal concoctions, and commercial preparations all cause harm. Even shower gel and liquid soap used internally can trigger irritation, inflammation, and infection. The vagina is self-cleaning; warm water on the external area is all that’s needed.
Other habits that help maintain a healthy vaginal environment include wearing breathable cotton underwear, changing out of wet swimsuits or workout clothes promptly, and avoiding scented tampons, pads, or sprays. Using condoms consistently also reduces BV risk, which aligns with the growing understanding that sexual transmission plays a larger role than previously thought.