The most commonly prescribed medicine for bacterial vaginosis (BV) is metronidazole, available as either an oral pill or a vaginal gel. Clindamycin, tinidazole, and secnidazole are also prescribed depending on your situation. Cure rates sit around 70% for standard courses of treatment, and most regimens last between one and seven days.
Metronidazole: The Most Common Option
Metronidazole is the go-to antibiotic for BV and comes in two forms: oral tablets taken twice a day for seven days, or a vaginal gel applied once daily for five days. One clinical trial found the two forms equally effective, both producing cure rates near 70%. Your provider will typically start with one of these options unless you have a reason to use something else.
The oral version works systemically, meaning it travels through your bloodstream to fight the bacterial imbalance. The vaginal gel targets the area directly, which tends to produce fewer body-wide side effects like nausea. There’s no strong evidence that one form works better than the other, so the choice often comes down to personal preference and how your body handles the medication.
A common concern with metronidazole is alcohol. The NHS recommends avoiding alcohol while taking metronidazole tablets, liquid, or suppositories, and continuing to avoid it for two full days after your last dose. That said, a review of the research found no convincing clinical evidence of a dangerous reaction between alcohol and metronidazole. Still, the standard advice is to play it safe and wait the two days.
Clindamycin: The Main Alternative
Clindamycin is the preferred alternative if you’re allergic to or can’t tolerate metronidazole. It’s most often prescribed as a vaginal cream (2% concentration), applied at bedtime for three or seven consecutive days. Pregnant patients are typically given the seven-day course. Clindamycin also comes in vaginal ovules (suppositories), which offer a shorter treatment window.
One important practical note: clindamycin cream and ovules are oil-based, which means they can weaken latex condoms and diaphragms. After using clindamycin cream, latex products may be unreliable for up to five days. For clindamycin ovules, the recommendation is to avoid latex or rubber barrier methods for at least 72 hours after treatment. If you rely on condoms for birth control or STI prevention, you’ll need a backup plan during and shortly after treatment.
Tinidazole and Secnidazole
Tinidazole belongs to the same drug class as metronidazole and works in a similar way. It’s typically prescribed as a shorter course or a single larger dose, making it a convenient option for people who have trouble sticking to a week-long regimen. If you can’t tolerate metronidazole, though, tinidazole may cause the same issues since the two drugs are closely related. In that case, clindamycin is the better alternative.
Secnidazole is the newest approved treatment for BV and comes as a single-dose oral granule. You mix it into a soft food like yogurt or applesauce and take it once. That’s the entire treatment. It appeals to people who want to avoid multi-day regimens, though it tends to cost more than generic metronidazole.
Oral Pills vs. Vaginal Treatments
Choosing between a pill and a vaginal treatment is partly about side effects. Oral metronidazole can cause nausea, a metallic taste in your mouth, diarrhea, dizziness, headache, and loss of appetite. Some people describe a “furry tongue” sensation. These effects are less common with the vaginal gel, since less of the medication enters your bloodstream.
Vaginal treatments have their own downsides. The most frequently reported side effects of vaginal metronidazole gel include vaginal itching, pain during sex, and a thick white discharge. Less commonly, you may notice burning during urination, irritation, or a feeling of vaginal pressure. Some people also experience cramps or mild skin irritation at the application site. Partners can occasionally experience burning or irritation of the penis as well.
Both forms clear BV at similar rates, so the decision really comes down to which set of trade-offs you prefer. If stomach issues are a dealbreaker, go vaginal. If you’d rather not deal with nightly applications, the pill may be simpler.
What Happens When BV Keeps Coming Back
BV recurs in a significant number of people, sometimes within just a few months. If you experience three or more episodes in a year, your provider may recommend suppressive therapy. This usually means completing a standard treatment course first, then continuing with a lower-frequency maintenance regimen (often vaginal metronidazole gel applied once or twice a week) for several months to keep the bacterial balance stable.
Recurrent BV is frustrating, and the cure rates for long-term suppression aren’t as high as most people hope. The condition often returns once maintenance therapy stops. Some providers incorporate boric acid vaginal suppositories as an add-on therapy, though this is used as a complement to antibiotics rather than a replacement. Boric acid helps restore the vaginal environment’s acidity, which makes it harder for BV-associated bacteria to thrive.
Treatment During Pregnancy
BV during pregnancy is treated with the same antibiotics, though providers tend to favor specific regimens. Clindamycin vaginal cream, for example, is prescribed for seven days rather than the shorter three-day course used in non-pregnant patients. Oral metronidazole is also considered safe during pregnancy. Treating BV in pregnancy matters because the infection is associated with a higher risk of preterm delivery and other complications.
Do Partners Need Treatment?
Current guidelines do not recommend routine antibiotic treatment for male sexual partners of someone with BV. BV isn’t classified as a sexually transmitted infection in the traditional sense, even though sexual activity can influence the vaginal bacterial balance. Some newer research is exploring whether treating male partners could reduce recurrence, but this isn’t standard practice yet. For female sexual partners, the picture is less clear, and some providers may consider concurrent treatment on a case-by-case basis.