Bacterial vaginosis (BV) is treated with prescription antibiotics, either taken by mouth or applied vaginally. Most cases clear up within five to seven days of starting treatment, though recurrence is common. The specific antibiotic your provider prescribes will depend on your preferences, whether you’re pregnant, and whether you’ve dealt with BV before.
First-Line Antibiotic Options
The CDC recommends three equally effective first-line treatments for BV:
- Metronidazole tablets: taken twice a day for 7 days
- Metronidazole vaginal gel: applied once a day for 5 days
- Clindamycin vaginal cream: applied at bedtime for 7 days
The oral and vaginal options work about equally well. Some people prefer the vaginal route because it tends to cause fewer side effects like nausea or a metallic taste. Others prefer a pill because it’s simpler. Your provider can help you decide which fits your life better.
Single-Dose and Shorter Treatments
If a seven-day course feels like a lot, there are shorter alternatives. Secnidazole is a one-time oral treatment: you take a single packet of granules mixed into food, and you’re done. Clinical trials show its cure rate at 28 days sits around 53% to 68%, which is comparable to the standard seven-day metronidazole course (about 60% for both). The convenience is real, but the trade-off is that it’s often more expensive and may not be covered by all insurance plans.
Tinidazole is another alternative, available as a two-day or five-day oral course. Clindamycin also comes in vaginal ovules that only require three nights of use.
Why BV Keeps Coming Back
Recurrence is the most frustrating part of BV. Even after successful treatment, roughly half of women experience a repeat episode within 12 months. The bacteria that cause BV form a sticky coating called a biofilm on the vaginal walls, and standard antibiotics don’t always eliminate it completely. Once treatment ends, surviving bacteria can multiply and tip the balance again.
For women dealing with frequent recurrences, providers sometimes prescribe a longer course of vaginal metronidazole gel used periodically after the initial treatment clears the infection. This suppressive approach helps keep the harmful bacteria from rebounding while the vaginal ecosystem stabilizes.
Treating Male Partners May Help
For years, the standard advice was that male partners didn’t need treatment for BV. A 2024 trial published in the New England Journal of Medicine challenged that. In the study, couples where the male partner also received antibiotics (oral plus a topical cream applied to penile skin for seven days) saw BV recurrence drop to 35% within 12 weeks. In couples where only the woman was treated, recurrence hit 63%. The trial was actually stopped early because the difference was so clear.
This is a relatively new finding, and not all providers have adopted it yet. If BV keeps returning, it’s worth asking whether concurrent partner treatment is an option.
Boric Acid and Probiotics
Boric acid suppositories are widely used for persistent BV, though they’re not FDA-approved for this purpose. They work by disrupting the protective biofilm that BV-causing bacteria build, which may make antibiotics more effective. The evidence is moderate, and most providers who recommend boric acid use it alongside antibiotics rather than as a standalone treatment.
Probiotics containing specific strains of Lactobacillus (the beneficial bacteria that normally dominate a healthy vagina) show some promise for preventing recurrence. One study of oral probiotics containing L. rhamnosus GR-1 and L. reuteri RC-14 found that 92% of participants had full recolonization of healthy vaginal bacteria after treatment. These strains are available in over-the-counter supplements. The evidence is encouraging but not yet strong enough for probiotics to replace antibiotics as a primary treatment.
What to Avoid During Treatment
If you’re prescribed metronidazole or tinidazole, you need to avoid alcohol completely during your course and for at least 48 to 72 hours after your last dose. Combining the two can trigger a reaction that includes intense nausea, vomiting, flushing, headache, and sweating. This reaction can last anywhere from 30 minutes to several hours. Watch for hidden alcohol in mouthwash, cooking sauces, and some medications as well.
Clindamycin cream is oil-based, which means it can weaken latex condoms and diaphragms for up to five days after use. If you’re using barrier contraception, you’ll need a backup method during that window.
BV During Pregnancy
BV during pregnancy is typically treated with the same antibiotics used outside of pregnancy, with oral metronidazole being the most commonly prescribed. Treatment matters because untreated BV during pregnancy is linked to a higher risk of preterm delivery and low birth weight. If you’re pregnant and notice the characteristic thin, grayish discharge with a fishy odor, getting tested and treated promptly is important.