BV Keeps Coming Back? Why Bacterial Vaginosis Recurs and How to Break the Cycle
Written by Cherlie Joseph, MSN, FNP-BC · Medically reviewed by Naurah Gaspard, DNP, FNP-C, FNP-BC · Updated November 2026
BV often comes back because antibiotics clear the symptoms but do not always rebuild the healthy lactobacilli that protect the vagina, and the bacteria can be passed back and forth with a sex partner. If you have had BV two or more times in a year, a longer suppressive treatment plan and, for some couples, treating a male partner at the same time can lower the chance of another episode.
In this guide
Why BV keeps coming back
Bacterial vaginosis (BV) happens when the normal balance of vaginal bacteria shifts. Protective Lactobacillus species drop, and other bacteria such as Gardnerella overgrow. Standard treatment with metronidazole or clindamycin knocks those bacteria down, so the odor and discharge usually go away within days. But recurrence is common, and there are a few reasons why:
- Biofilm. BV bacteria can form a sticky layer on the vaginal wall that antibiotics do not fully clear.
- Lactobacilli do not always bounce back. Without them, the vaginal pH stays higher and BV bacteria regrow.
- Reinfection from a partner. Research now shows BV-associated bacteria live on the penis and can be passed back after the woman is treated.
- Triggers that keep happening. Douching, a new or multiple sex partners, and sex without condoms are all linked with BV, according to the CDC. Copper IUDs are also associated with higher BV rates.
Does treating my partner help?
For years, guidelines said treating male partners did not help. That changed in 2025. A randomized trial published in the New England Journal of Medicine followed 164 monogamous couples. Women in both groups got standard BV treatment. In one group, the male partner also took oral metronidazole and applied clindamycin cream to the penis twice daily for 7 days.
Within 12 weeks, BV came back in 35% of women whose partners were treated, compared with 63% of women whose partners were not. The difference was large enough that the trial was stopped early. Partners mostly reported mild side effects such as nausea, headache and a metallic taste.
In October 2025, the American College of Obstetricians and Gynecologists (ACOG) began recommending concurrent partner treatment for women with recurrent BV (two or more episodes in a year) who are in a monogamous relationship with a male partner. It is not yet known whether this applies to women with female partners or to people with several partners. A provider can talk through whether it makes sense for you.
Longer treatment plans for recurrent BV
When BV returns once, repeating the same 7-day treatment or switching to a different first-line medicine is reasonable. When it keeps returning, the CDC describes suppressive options a provider may consider:
| Approach | What it involves | Good to know |
|---|---|---|
| Suppressive metronidazole gel | Vaginal gel used twice a week for several months after a full treatment course | Reduces recurrences while you use it; the benefit can fade after stopping |
| Antibiotic, then boric acid, then gel | A 7-day oral course, then vaginal boric acid for 21 days, then twice-weekly gel for 4 to 6 months | Boric acid is used vaginally only and is toxic if swallowed; not for use in pregnancy |
| Partner treatment | Male partner treated at the same time as you | Best evidence is for monogamous couples |
Your provider chooses the medicine and schedule based on your history, pregnancy status and other medicines. Do not stretch out or repeat old prescriptions on your own.
Everyday habits that lower your risk
- Skip douching and scented washes. The vagina cleans itself; douching is linked with BV and relapse. Plain water on the vulva is enough.
- Use condoms, especially with a new partner and during treatment. Note that clindamycin cream is oil-based and can weaken latex condoms for several days after use.
- Finish every dose, even if you feel better in two days.
- Talk about your birth control. Hormonal contraception does not raise BV risk and may be protective, while copper IUDs are linked with more BV.
- Probiotics: research on oral and vaginal probiotics is promising but mixed, so they are an add-on, not a replacement for treatment.
When to get checked again
Get evaluated rather than self-treating if this is your third episode, if symptoms come back within a few weeks, or if you are pregnant. Recurrent symptoms are sometimes not BV at all. Trichomoniasis, a yeast infection or a mixed infection can look similar, and an STI test may be worth doing at the same time. If over-the-counter yeast products have not helped, that is another clue it may be BV or something else.
Get in-person care or call 911 if you have:
- Fever, chills or pelvic or lower belly pain
- Vaginal bleeding or discharge during pregnancy
- Severe pain during sex or pain with a fever after a procedure
- Feeling faint, vomiting or unable to keep fluids down
Frequently asked questions
Why does my BV come back after my period?
Menstrual blood raises vaginal pH, which can favor BV bacteria. If BV reliably shows up after periods, mention that pattern to your provider; it may support a suppressive plan.
Is recurrent BV an STI?
BV is not classified as an STI, but it is linked to sexual activity, and 2025 research showed treating a male partner lowered recurrence. You can also get BV without ever having sex.
Can I drink alcohol while taking metronidazole for BV?
Product labels advise avoiding alcohol during metronidazole and for at least 3 days after. CDC guidance notes the evidence for a serious reaction is weak, but follow your pharmacist's and the label's instructions.
Sources
- CDC: Bacterial Vaginosis, STI Treatment Guidelines
- Vodstrcil LA, et al. Male-Partner Treatment to Prevent Recurrence of Bacterial Vaginosis. N Engl J Med. 2025
- ACOG: Concurrent sexual partner treatment for recurrent BV (October 2025)
Keep reading
- BV treatment with metronidazole: pills vs gel
- Yeast infection vs BV: how to tell the difference
- What causes BV?
- Browse all conditions and treatments A to Z
Cherlie Joseph, MSN, FNP-BC
Board-certified family nurse practitioner licensed in Florida, caring for adults online at OurTopClinic. Meet our providers.
This article is for general education and is not a substitute for medical advice. Treatment, including any prescription, is decided by a licensed provider after reviewing your health history. OurTopClinic is not for emergencies; if you have a medical emergency, call 911. OurTopClinic serves adults located in Florida, New Mexico, Oregon and Washington. Learn more at ourtopclinic.com.
