Bacterial vaginosis (BV) is treated with prescription antibiotics, most commonly metronidazole or clindamycin. There are no over-the-counter medications that cure BV. Both oral pills and vaginal creams or gels are effective, and most treatment courses last five to seven days.
First-Line Treatments
The CDC recommends three main options for treating BV, all considered equally effective as first choices:
- Metronidazole oral tablets: Taken twice a day for seven days. This is the most widely prescribed option and works by killing the overgrown bacteria causing the imbalance.
- Metronidazole vaginal gel (0.75%): Applied once daily at bedtime for five days using a pre-filled applicator. Each dose delivers a much smaller amount of the drug than the oral version, which means fewer body-wide side effects like nausea.
- Clindamycin vaginal cream (2%): Applied at bedtime for seven days. This is a good alternative if you’ve had stomach issues with metronidazole in the past or can’t tolerate it.
Your provider will typically choose between these based on your preferences, side effect history, and whether you’re more comfortable taking a pill or using a vaginal applicator. Oral metronidazole tends to be the default because it’s inexpensive and straightforward, but the vaginal options work just as well for most people.
Alternative Antibiotics
If the standard options don’t work or aren’t a good fit, tinidazole is another oral antibiotic sometimes prescribed. It belongs to the same drug class as metronidazole but can be taken on a shorter schedule. The typical regimen is either a higher dose once daily for two days or a lower dose once daily for five days. Secnidazole is a newer option that comes as a single-dose oral granule you mix into food, making it the only one-and-done treatment for BV.
Important Rules During Treatment
If you’re taking metronidazole in any form, you need to avoid alcohol completely during treatment and for two full days after your last dose. Combining the two can cause severe nausea, vomiting, flushing, and a rapid heartbeat. Tinidazole carries the same alcohol restriction, typically for at least three days after finishing.
Clindamycin vaginal cream has a different concern: it weakens latex. If you use latex condoms or a diaphragm, they may not be reliable during treatment and for five days after your last dose. The oil-based ingredients in the cream compromise the integrity of the latex, so you’ll need an alternative barrier method or abstinence during that window.
What About Probiotics?
Probiotics containing specific Lactobacillus strains have shown some promise in small studies. One clinical trial of 60 women compared vaginal probiotic capsules (containing L. rhamnosus GR-1 and L. reuteri RC-14) to oral metronidazole. After four weeks, 88% of the probiotic group was cured compared to 51% in the metronidazole group, with no relapses in the probiotic group versus a 14% relapse rate with metronidazole alone.
Those numbers are encouraging, but this was a small study, and the broader research on probiotics for BV is mixed. Probiotics are not part of official treatment guidelines. They may be worth discussing with your provider as a complement to antibiotics, especially if you deal with recurring infections, but they aren’t a substitute for prescription treatment on their own.
Why OTC Products Don’t Work
You’ll find gels, suppositories, and washes marketed for vaginal odor and pH balance at the pharmacy. None of these are FDA-approved to treat BV. They may temporarily mask symptoms like odor or discharge, but they don’t eliminate the bacterial overgrowth causing the problem. BV requires prescription antibiotics to clear the infection. If you suspect you have BV, getting tested and treated properly is the fastest path to relief and reduces the risk of complications like increased susceptibility to sexually transmitted infections.
When BV Keeps Coming Back
Recurrence is one of the most frustrating aspects of BV. More than half of women treated for BV experience another episode within 12 months. For recurrent cases, providers often prescribe an extended course of the same antibiotics used for initial treatment, sometimes followed by a maintenance phase where you use metronidazole vaginal gel periodically to keep the bacterial balance in check.
The goal of maintenance therapy is to give your vaginal microbiome time to re-establish a healthy population of protective bacteria. There’s no single protocol that works for everyone with recurrent BV, so treatment often involves some trial and adjustment. Factors like a new sexual partner, douching, or smoking can increase recurrence risk, so addressing those where possible helps the medication do its job.
Treatment During Pregnancy
BV during pregnancy is associated with a higher risk of preterm delivery and low birth weight. The same core antibiotics, metronidazole and clindamycin, are used during pregnancy and are considered safe. Your provider may prefer the oral tablet form to ensure the medication reaches its full effectiveness, but vaginal formulations are also used depending on the situation. If you’re pregnant and notice the characteristic thin, grayish discharge or fishy odor, getting tested promptly matters more than usual because of the potential pregnancy complications.