Bacterial vaginosis (BV) is treated with prescription antibiotics, either taken by mouth or applied vaginally. The three main medications are metronidazole, clindamycin, and secnidazole, and all require a prescription. There are no over-the-counter antibiotics approved to treat BV in the United States.
First-Line Treatments
The CDC recommends three equally effective regimens as first-line options:
- Metronidazole oral tablets: taken twice a day for 7 days
- Metronidazole vaginal gel (0.75%): applied once a day for 5 days
- Clindamycin vaginal cream (2%): applied at bedtime for 7 days
None of these is clearly better than the others in terms of cure rates. A clinical trial comparing oral metronidazole tablets to vaginal metronidazole gel found nearly identical results: about 71% of women in both groups were still BV-free at the final follow-up visit. The key difference was side effects. About 52% of women taking oral metronidazole reported stomach issues like nausea, metallic taste, or upset stomach, compared to 33% using the vaginal gel. If you’re prone to GI problems, the topical route may be more comfortable.
Alternative and Single-Dose Options
For women who struggle with a multi-day regimen, secnidazole is an oral medication that works as a single dose. It comes as granules that you sprinkle onto soft food like yogurt or applesauce and eat without chewing. The convenience is appealing, but secnidazole tends to cost significantly more than generic metronidazole, and it is listed as an alternative rather than a first-line choice in CDC guidelines.
Tinidazole is another oral alternative that belongs to the same drug family as metronidazole. It can be prescribed for BV but is typically reserved for cases where the standard options haven’t worked.
Oral clindamycin (taken twice a day for 7 days) and clindamycin vaginal ovules (inserted at bedtime for 3 nights) are additional alternatives your provider may offer depending on your situation.
Avoiding Alcohol on Metronidazole
Metronidazole and tinidazole can cause a severe reaction when mixed with alcohol: flushing, nausea, vomiting, rapid heartbeat, and cramping. You need to avoid all alcohol during treatment and for at least 3 days after your last dose. This includes beverages, cooking wines, and products containing propylene glycol, which is found in some medications and food items. Clindamycin and secnidazole do not have this interaction.
Oral vs. Vaginal: How to Choose
Since cure rates are essentially the same, the choice between oral and vaginal treatment often comes down to personal preference and side effects. Oral pills are simpler for many people, just swallow twice a day and go about your life. But the vaginal options deliver medication directly where it’s needed, which means far less of the drug enters your bloodstream. That translates to fewer systemic side effects like nausea, diarrhea, and that characteristic metallic taste.
One practical consideration with vaginal creams and gels: clindamycin cream and some gel formulations contain oils that can weaken latex condoms and diaphragms. If you’re relying on barrier contraception, you may need to use a backup method or choose the oral route instead.
Treatment During Pregnancy
BV during pregnancy is not something to ignore. It has been linked to premature rupture of membranes, preterm birth, and postpartum infections, so treatment is recommended for all pregnant women with symptoms.
The good news is that all three first-line regimens (oral metronidazole, metronidazole gel, and clindamycin cream) are considered safe in pregnancy. Although metronidazole crosses the placenta, multiple large studies have found no evidence of birth defects or harmful effects on infants. Earlier concerns about vaginal clindamycin during pregnancy have also been resolved by newer data showing it is safe.
Tinidazole should be avoided entirely during pregnancy because animal studies suggest moderate risk, and human data are too limited. Secnidazole also lacks sufficient safety data for use in pregnancy.
When BV Keeps Coming Back
Recurrent BV is frustratingly common. Roughly half of women treated for BV experience another episode within 12 months. When that happens, the same antibiotics are used again, but your provider may also recommend a longer-term suppressive approach, typically using metronidazole gel a few times per week for several months after the initial treatment course clears the infection.
Boric acid vaginal suppositories (600 mg, used nightly for up to 14 days) are sometimes recommended as an add-on for recurrent BV, particularly when standard antibiotics alone are not keeping it from returning. Boric acid is not an antibiotic. It works by lowering vaginal pH and disrupting the protective biofilms that BV-causing bacteria build around themselves, which may explain why some infections survive conventional treatment. Boric acid suppositories are available without a prescription, but they should only be used vaginally and never taken by mouth, as oral boric acid is toxic.
Probiotics as an Add-On
Probiotics are not a standalone treatment for BV, but emerging evidence suggests they may improve outcomes when used alongside antibiotics. A meta-analysis pooling data from 16 clinical trials found that women who used probiotics in addition to standard treatment had significantly higher cure rates (about 3.3 times the odds of clearing the infection compared to antibiotics alone). Even more notable, the recurrence rate was cut roughly in half in the probiotic group.
The strains with the most clinical data behind them are Lactobacillus rhamnosus GR-1, Lactobacillus reuteri RC-14, and Lactobacillus crispatus (including the CTV-05 strain). These are the species that naturally dominate a healthy vaginal environment, and the logic is straightforward: replenishing them helps restore the acidic pH that keeps harmful bacteria in check. Not every probiotic supplement contains these specific strains, so check labels carefully if you go this route.
What You Cannot Treat Over the Counter
No antibiotic for BV is available without a prescription in the U.S. Products marketed for “vaginal health” or “pH balance” at drugstores, such as gels, washes, or suppositories, are not treatments for BV. They may temporarily mask the odor, but they will not clear the underlying bacterial imbalance. If you have the telltale thin, grayish discharge with a fishy smell, you need a prescription. Many telehealth services now offer BV treatment after a virtual visit, making it faster to get antibiotics without an in-person appointment.