Bacterial vaginosis (BV) is treated with prescription antibiotics, most commonly metronidazole or clindamycin. There are no over-the-counter medications that treat BV, so you’ll need a healthcare provider to diagnose it and write a prescription. The good news is that a standard course of antibiotics clears up most cases within about a week.
First-Line Antibiotics for BV
The two antibiotics prescribed most often for BV are metronidazole and clindamycin. Both work by killing the overgrown bacteria that cause the characteristic fishy odor, thin discharge, and irritation. They come in different forms, and which one you’re prescribed usually depends on your preferences, medical history, and whether you’re pregnant.
Metronidazole is the most widely used BV treatment. It’s available as an oral pill (taken twice a day for seven days) or as a vaginal gel (applied once daily for five days). The oral version treats the infection systemically, while the gel targets the vagina directly with fewer side effects like nausea. Both are equally effective for a first episode.
Clindamycin is the main alternative. It comes as a vaginal cream applied at bedtime for seven days, or as an oral pill. Some providers also prescribe clindamycin vaginal suppositories for a shorter three-day course. Clindamycin cream is oil-based, which means it can weaken latex condoms and diaphragms for up to five days after you finish treatment.
Single-Dose Options
If you want a simpler regimen, two medications offer shorter treatment courses. Tinidazole is closely related to metronidazole and can be taken as a single daily dose for fewer days. Secnidazole is a newer option: it’s a single oral dose of granules you mix into food like yogurt or applesauce and take just once. That one-and-done convenience can be appealing if you know you’ll have trouble sticking to a weeklong regimen, though it tends to cost more.
Why You Can’t Buy BV Treatment Over the Counter
No FDA-approved BV antibiotic is available without a prescription. Products marketed for “vaginal odor” or “pH balance” at the drugstore are not treatments for BV. They may temporarily mask symptoms, but they won’t clear the bacterial imbalance causing the infection. If you suspect BV, you need a proper diagnosis, partly because the symptoms overlap with yeast infections and other conditions that require completely different treatment.
The Alcohol Rule With Metronidazole
If you’re prescribed metronidazole or tinidazole, you need to avoid alcohol during the entire course and for at least three days after your last dose. Combining these medications with alcohol can trigger severe nausea, vomiting, flushing, and cramping. This applies to all forms of alcohol, including wine and beer. Clindamycin doesn’t carry this restriction, so if avoiding alcohol for that window isn’t realistic for you, it’s worth mentioning to your provider.
What Happens When BV Keeps Coming Back
Recurrence is the most frustrating part of BV treatment. Nearly half of women who are successfully treated experience a recurrence within three months. This isn’t because the antibiotics failed the first time. BV-causing bacteria can form a protective film along the vaginal lining that antibiotics don’t fully penetrate, allowing the infection to re-establish itself once treatment stops.
For recurrent BV, providers typically use a longer, multi-step approach. One CDC-outlined regimen starts with a seven-day course of oral metronidazole or tinidazole, followed by vaginal boric acid suppositories (600 mg daily) for 21 days, then twice-weekly metronidazole gel for four to six months as maintenance. The maintenance phase is key: using metronidazole gel or suppositories twice a week for three months or longer reduces recurrences, though the benefit fades once you stop the suppressive therapy.
Boric acid on its own isn’t an antibiotic. It works by lowering vaginal pH and disrupting the bacterial film, which helps the antibiotics do their job more effectively. Boric acid suppositories are available without a prescription, but they’re used as part of a broader treatment plan for recurrent BV, not as a standalone cure for a first episode.
Do Probiotics Help?
Probiotics containing Lactobacillus strains have shown real promise as an add-on to antibiotic treatment. A meta-analysis of 10 clinical trials covering over 1,200 women found that probiotics reduced the risk of BV recurrence by 45% compared to placebo or antibiotics alone. Recurrence rates dropped from about 25.5% to 14.8% in the probiotic groups.
Interestingly, the specific strain, dose, and delivery method (oral capsules versus vaginal suppositories) didn’t seem to matter much. What mattered was using probiotics alongside or after antibiotic treatment. Probiotics aren’t a replacement for antibiotics, but if you’re dealing with repeated infections, they’re a reasonable addition to discuss with your provider.
BV Treatment During Pregnancy
BV during pregnancy is worth treating because it’s associated with preterm birth and low birth weight. Metronidazole, both oral and vaginal, is considered safe during pregnancy and is the most commonly prescribed option. Clindamycin is also used. Tinidazole and secnidazole are generally avoided during pregnancy due to limited safety data. If you’re pregnant and notice the telltale thin, grayish discharge or fishy smell, getting treated promptly matters more than in non-pregnant women.
What to Expect During Treatment
Most women notice improvement within two to three days of starting antibiotics, though you should finish the full course even if symptoms clear up early. Stopping early increases the chance of recurrence. Common side effects of metronidazole include nausea, a metallic taste in your mouth, and mild stomach upset. Clindamycin cream can sometimes trigger a yeast infection because it disrupts the vaginal flora further while killing BV bacteria.
You don’t typically need a follow-up visit if symptoms resolve completely. But if your symptoms return within a few weeks or months, that’s when the conversation shifts toward the longer suppressive regimens described above. Keeping track of how many times BV returns and when helps your provider choose the right maintenance strategy.