How Do Guys Get Rid of BV? What Men Can Actually Do

Men cannot be diagnosed with bacterial vaginosis because it is, by definition, a vaginal condition. But men absolutely carry the bacteria that cause it, and a landmark 2025 trial published in the New England Journal of Medicine showed that treating the male partner with antibiotics cut BV recurrence roughly in half. So while the framing of “getting rid of BV” does not quite apply to men the way it does to women, men play a much larger role in the cycle of infection and reinfection than medicine recognized for decades. The science on this has shifted dramatically in recent years, and there are concrete things men can do.

Men Carry BV-Associated Bacteria Without Knowing It

BV happens when the normal balance of bacteria in the vagina tips away from protective lactobacilli and toward a mix of anaerobic bacteria, especially Gardnerella vaginalis. For a long time, BV was treated as a problem that originated and lived entirely in the vagina. That view has crumbled. Research now shows that the penis, particularly the area under the foreskin and the opening of the urethra, harbors many of the same anaerobic bacteria found in women with BV.

An older but well-cited study found Gardnerella vaginalis in roughly one in seven heterosexual men attending an STI clinic, and those men had no symptoms of infection at all.¹ More recent microbiome sequencing work has added layers of detail. Researchers found that bacteria linked to vaginal dysbiosis were present only in men who reported vaginal intercourse, not in men who had not had vaginal sex, strongly suggesting that sexual contact is the route of exchange.² And the exchange runs both ways: when couples were studied together, the penile skin and urethral bacteria of male partners of women with BV closely matched their female partner’s vaginal bacteria, more so than they matched the vaginal bacteria of unrelated women with BV.³

Perhaps the most striking finding is that the composition of a man’s penile microbiome can predict whether his female partner will develop BV, with high accuracy. The temporal sequence matters here: the bacteria show up on the man’s penis before the woman develops symptoms, not the other way around. That means the penile microbiome is not just passively reflecting what is happening in the vagina. It can actively contribute to it.⁴

Do Men Get Symptoms From BV Bacteria?

Almost never. Most men who carry BV-associated bacteria have zero symptoms and no idea they are harboring anything. That is part of what made the male role in BV so easy to overlook for so long. There is no male equivalent of the discharge, odor, or irritation that women with BV experience.

There are rare exceptions. A small number of case reports have documented a condition called balanoposthitis, an inflammation of the glans and foreskin, linked specifically to Gardnerella vaginalis. The men presented with redness and itching on the head of the penis, irritation of the foreskin, and minimal discharge. The syndrome was described as similar to BV itself, just in a different anatomical location.⁵ But this is uncommon enough that it does not drive clinical testing or treatment in men. For the vast majority, the reason to care about BV bacteria is not personal symptoms but the impact on a partner.

The Trial That Changed the Conversation

For years, clinical guidelines explicitly said not to treat the male partner when a woman had BV. That recommendation was based on a handful of older trials that gave men a single antibiotic, usually oral metronidazole or clindamycin alone, and found no difference in BV recurrence for their female partners.⁶ A systematic review of those six earlier trials confirmed the pattern: male partner treatment as it had been tried did not produce a clear benefit.⁷

But researchers suspected the problem was with how those trials were designed, not with the underlying concept. BV bacteria do not just live in the urethra. They colonize the penile skin, the area under the foreskin, and even semen. Hitting one anatomical site with one antibiotic might not be enough. The bacteria sitting on skin could simply recolonize after treatment ended.

The StepUp trial, published in the New England Journal of Medicine in 2025, tested a combination approach. Male partners took oral metronidazole tablets twice daily and applied a clindamycin cream to the penile skin twice daily, both for seven days. The idea was to attack bacteria from two angles at once: systemic antibiotics for the urethra and topical antibiotics for the skin surface. Women in the trial received standard BV treatment. The results were dramatic. Among women whose male partners received the combination treatment, about a third experienced BV recurrence within 12 weeks. Among women whose partners got no treatment, nearly two-thirds recurred.⁸

An earlier pilot study using the same combination regimen had hinted at this result. In that smaller cohort, the combination treatment significantly reduced BV-associated bacteria across all three anatomical sites in men (penile skin, urethra, and the sub-preputial space), and suppression of those bacteria was sustained in about four-fifths of the women over 12 weeks. Only about one in six women in that pilot recurred, compared to the much higher rates typically seen.⁹

Why a Single Antibiotic Was Not Enough

The failure of earlier partner-treatment trials had a real cost. It cemented, for an entire generation of clinicians, the belief that BV had nothing to do with men. A recent meta-analysis confirmed that male partner monotherapy, giving men just one antibiotic, does not reliably reduce BV recurrence.¹⁰ The reason likely comes down to anatomy. BV-associated bacteria are more prevalent in the space under the foreskin and in the distal urethra of men whose partners have BV, and a biofilm dominated by BV organisms has been detected in male urine and semen more commonly in these men as well.¹¹ An oral antibiotic can reach the urethra, but it does a poor job clearing bacteria living on external skin. And a topical cream can handle the skin but will not penetrate to the urethra or prostate. The combination addresses both reservoirs simultaneously.

Even more telling is what happened when researchers tried a different approach: having men use a penile antiseptic wash after sex instead of antibiotics. A randomized trial of that microbicide strategy found it actually increased BV diagnoses in female partners rather than preventing them. The hazard ratio was above one, meaning the wash made things worse.¹² The likely explanation is that harsh antiseptics disrupt the normal penile microbiome, potentially clearing protective skin bacteria while leaving the more resilient BV-associated anaerobes intact. This is an important cautionary note: aggressive washing or using antiseptic products on the penis is not the answer and can backfire.

How Circumcision Fits Into the Picture

The foreskin creates a warm, moist, low-oxygen environment underneath it, which is ideal for the anaerobic bacteria associated with BV. Male circumcision removes that niche. A randomized trial in Rakai, Uganda found that BV prevalence was significantly lower among the wives of circumcised men compared to uncircumcised men, with an estimated protective effect of about 18%.¹³ Another dataset from the same population confirmed that circumcision reduces the load of BV-associated bacteria on penile skin.¹⁴

In the microbiome prediction study mentioned earlier, BV incidence among couples where the woman did not already have BV at the start was about 37% when the man was uncircumcised versus 26% when circumcised.¹⁵ That is a meaningful difference, though circumcision alone does not eliminate risk. No one is suggesting circumcision as a BV treatment. But for men who are already circumcised, it is worth knowing they may carry a somewhat lower bacterial burden. And for uncircumcised men, it underscores why thorough but gentle hygiene under the foreskin matters, and why the topical clindamycin component of the StepUp regimen targets that specific area.

What Men Can Do Right Now

The evidence points to several practical steps, though one important caveat applies: the combination antibiotic approach from the StepUp trial is not yet standard of care everywhere. Clinical guidelines take time to update, and your partner’s doctor may or may not be familiar with the latest data. Here is what the research supports:

Ask about concurrent treatment: If your partner has recurrent BV, the strongest available evidence says that you taking a week-long course of oral metronidazole plus topical penile clindamycin alongside her treatment substantially reduces recurrence. Bring the StepUp trial up with a healthcare provider if it has not been offered.
Do not self-treat with antiseptics: Over-the-counter antibacterial washes, hydrogen peroxide, or antiseptic soaps applied to the penis have no evidence of benefit and one trial showed they can make things worse. Gentle soap and water is sufficient for daily hygiene.
Use condoms during and after treatment: Condom use reduces the exchange of bacteria between partners. A narrative review of the penile microbiome literature notes that condom use is one of the factors that influences the composition of the penile microbiome, along with circumcision status and antibiotic use.¹⁶ While condoms alone are not a complete solution, they reduce re-exposure during the window when treatment is trying to reset the vaginal microbiome.
Complete the full course: If you are prescribed antibiotics, finish all seven days even if you have no symptoms yourself. Remember, men rarely feel anything from these bacteria. The point of treatment is to clear the penile reservoir so that bacteria are not reintroduced to your partner.

BV Bacteria and Male Fertility

There is a separate, less widely discussed angle: BV-associated bacteria in semen may affect male fertility. A study of 229 semen samples from male partners of infertile couples found BV-associated organisms in nearly two-thirds of samples. Gardnerella vaginalis alone was present in about half. Some of these organisms were linked to abnormal semen characteristics, including increased viscosity and abnormal sperm shape.¹⁷ This is a single study from a specific population (couples already seeking fertility treatment), so it would be premature to draw sweeping conclusions. But it suggests that the conversation about BV bacteria in men extends beyond just preventing recurrence in a female partner. Clearing these organisms might have benefits for the man’s own reproductive health, though more research is needed before anyone can say that with confidence.

Talking to Your Partner About It

One of the biggest barriers to concurrent treatment is not medical but social. BV has long been framed as a “women’s issue,” and many men have never heard of it. Women often feel embarrassed bringing it up, and some worry their partner will think they are being accused of having an STI. Qualitative research with couples who went through the StepUp trial found that how the topic was introduced mattered enormously. Women, men, and healthcare providers all needed to understand BV and the rationale for partner treatment before couples could move forward effectively.¹⁸

Men who participated in partner treatment generally reported it as a positive experience. In interviews, men described the week of shared treatment as a bonding experience that strengthened their relationship, framing it as something they tackled as a team rather than as a burden or accusation.¹⁹ The practical inconvenience of a week of antibiotics and cream was minor compared to the relief of breaking a recurrence cycle that had, in some cases, gone on for years.

If your partner brings up BV, the most helpful thing you can do is treat it as a shared problem with a shared solution. The science increasingly backs that framing. You are not being blamed for causing an infection. You are being invited to help fix a bacterial imbalance that passes between partners during normal sexual activity, much the same way a cold circulates through a household.

Why Guidelines Have Been Slow to Catch Up

The gap between what the research shows and what clinicians routinely do is wider for BV partner treatment than for almost any other common infection. BV affects somewhere between one in ten and one in three women and recurs in a substantial fraction within a few months of treatment. Despite epidemiological and microbiological data consistently pointing toward a sexually transmissible component, the official recommendation for decades was to not treat the male partner. Researchers have written openly about how the failure of early monotherapy trials eroded confidence in the concept of sexual transmission, even as evidence for bacterial exchange between partners kept accumulating.²⁰

The StepUp trial was the first to use a combination antibiotic regimen specifically designed for the anatomy of the penis, and its results were strong enough to reopen the question. But translating a single landmark trial into updated clinical guidelines takes time. Professional societies need to review the data, weigh it against the older trials, and decide how to frame recommendations. In the meantime, some clinicians are already prescribing concurrent partner treatment off the back of the StepUp results, while others are waiting for formal guideline updates. If you or your partner are dealing with recurrent BV and your doctor is not aware of this trial, it is entirely reasonable to bring it up and ask whether the combination regimen is appropriate for your situation.