Bacterial vaginosis (BV) is treated with prescription antibiotics, most commonly metronidazole or clindamycin. There is no over-the-counter medication that cures BV on its own. Most treatment courses last seven days or less, and a single-dose option is also available.
Oral Metronidazole: The Standard Treatment
Metronidazole taken by mouth is the most widely prescribed treatment for BV. The standard regimen is 500 mg twice a day for seven days. It works by killing the overgrowth of anaerobic bacteria that causes BV symptoms like discharge and odor.
The biggest thing to know about metronidazole is the alcohol restriction. You cannot drink alcohol while taking it and should continue avoiding alcohol for two full days after finishing the course. Mixing the two can cause severe nausea, vomiting, cramping, and flushing. Other common side effects include a metallic taste in your mouth, mild nausea, and occasional headaches. These typically fade once you finish the medication.
Vaginal Clindamycin Cream
Clindamycin is available as a vaginal cream that comes in a prefilled applicator. The single-dose version involves inserting one applicator (5 grams of cream) into the vagina at any time of day. This one-day treatment is convenient if you prefer not to take oral antibiotics or want a shorter course.
One practical consideration: oil-based vaginal clindamycin can weaken latex condoms and diaphragms, so you may need to use an alternative form of birth control during treatment and for a few days afterward. Vaginal clindamycin is appropriate for teens who have started their periods but is not used before menstruation begins.
Single-Dose Oral Option
Secnidazole is an oral antibiotic that treats BV in a single dose. It comes as a packet of granules that you sprinkle onto applesauce, yogurt, or pudding and eat within 30 minutes. You swallow the granules whole without chewing or crunching them, and a glass of water afterward helps wash them down. The granules do not dissolve in liquid, so mixing them into a drink won’t work.
The appeal of secnidazole is obvious: one dose and you’re done. The tradeoff is cost. It tends to be significantly more expensive than metronidazole, and not all insurance plans cover it. If adherence to a seven-day course is a challenge for you, it may be worth asking about.
Metronidazole Gel
Metronidazole also comes in a vaginal gel form, which is applied directly inside the vagina, typically once daily for five days. This option delivers the medication locally rather than throughout your whole body, which can reduce side effects like nausea and the metallic taste that the oral version causes. The alcohol restriction still applies with the gel form, though the systemic absorption is lower.
What About Over-the-Counter Products?
No over-the-counter product is proven to cure BV by itself. Boric acid vaginal suppositories are sometimes used alongside prescription antibiotics, and one study of 105 women with recurrent BV found that combining boric acid with antibiotic therapy resulted in a 69% cure rate at six months. A separate randomized trial of a boric acid-based formulation showed 50% to 59% effectiveness for early clinical cure on its own. That’s notably lower than standard antibiotics, and research on boric acid alone for BV remains limited.
Probiotics, pH-balancing gels, and other products marketed for vaginal health may help with symptoms or general vaginal balance, but none of them replace antibiotics for an active BV infection. If you’re dealing with discharge, odor, or irritation, you need a prescription to clear the underlying bacterial imbalance.
Treatment During Pregnancy
BV during pregnancy is typically treated with oral metronidazole or oral clindamycin. Vaginal formulations of both medications are also used. The optimal regimen for pregnant individuals isn’t fully settled, so your provider will choose based on your trimester and health history. Treating symptomatic BV in pregnancy matters because the infection has been linked to preterm delivery and other complications.
When BV Keeps Coming Back
Recurrence is one of the most frustrating aspects of BV. Roughly half of women treated for BV experience a return of symptoms within 12 months. When that happens, providers often prescribe the same first-line antibiotics again for the acute episode, then add a maintenance strategy to prevent another recurrence. This might involve using vaginal metronidazole gel periodically over several months to keep the bacterial balance stable.
Some providers incorporate boric acid suppositories as part of a maintenance plan after antibiotic treatment, based on the recurrence data showing improved long-term cure rates with the combination. If you’ve been treated more than twice in a year, it’s worth having a conversation specifically about a prevention-focused plan rather than just treating each episode as it comes.
Side Effects Across Medications
All BV antibiotics share some common side effects, though the type and intensity vary by formulation:
- Oral metronidazole: metallic taste, nausea, headache, and the strict alcohol restriction for the duration of treatment plus 48 hours after
- Vaginal clindamycin: local irritation, yeast infection (since it can disrupt vaginal flora further), and weakened latex barriers
- Secnidazole: similar side effect profile to metronidazole but compressed into a single exposure, so any nausea or taste changes tend to be brief
- Vaginal metronidazole gel: generally fewer systemic side effects than the oral form, with occasional local irritation
Yeast infections after BV treatment are common enough that some providers will give you a prescription antifungal to have on hand, just in case. The antibiotics that clear BV bacteria can also reduce the beneficial bacteria that keep yeast in check.