Bacterial vaginosis (BV) is treated with prescription antibiotics, and no over-the-counter product is proven to cure it. The most commonly prescribed options are metronidazole and clindamycin, available in both oral and vaginal forms. A newer single-dose option also exists for people who want a one-and-done treatment. While these medications are effective at clearing the infection, recurrence is common, with 50% to 80% of women experiencing BV again within a year of finishing antibiotics.
First-Line Prescription Treatments
Metronidazole is the most widely used antibiotic for BV. It comes as an oral tablet typically taken twice a day for seven days, or as a vaginal gel applied once daily for five days. Both forms have similar cure rates, so the choice often comes down to personal preference and how you respond to side effects. Oral metronidazole can cause nausea, a metallic taste in the mouth, and stomach upset. The vaginal gel avoids most of those digestive side effects but may cause local irritation.
Clindamycin is the other first-line option. It’s most often prescribed as a vaginal cream used at bedtime for seven days, though oral capsules are also available. One practical consideration: clindamycin cream is oil-based, which can weaken latex condoms and diaphragms during treatment and for several days afterward.
Single-Dose and Short-Course Options
If a seven-day course feels inconvenient, there are shorter alternatives. Secnidazole is an FDA-approved single-dose treatment. You take one 2-gram packet of granules, sprinkled onto applesauce, yogurt, or pudding, and consume the entire mixture within 30 minutes. The granules don’t dissolve and shouldn’t be chewed. You can eat it with or without a meal, and the entire treatment is finished in one sitting.
Tinidazole is another shorter-course option. The CDC lists two regimens: 2 grams taken orally once daily for 2 days, or 1 gram once daily for 5 days. Tinidazole is chemically similar to metronidazole and carries the same restriction on alcohol (more on that below), but some people tolerate it better in terms of stomach side effects.
The Alcohol Rule With Metronidazole and Tinidazole
You need to avoid alcohol completely while taking metronidazole or tinidazole. Combining the two can cause severe nausea, vomiting, flushing, and rapid heartbeat. According to the NHS, you should continue avoiding alcohol for at least 2 full days after your last dose of metronidazole to give the drug time to leave your body. For tinidazole, the waiting period is typically 3 days. This applies to all forms of alcohol, including wine, beer, and spirits, as well as alcohol-containing mouthwashes and cold medicines.
Why OTC Products Don’t Work
You’ll find vaginal gels, suppositories, and probiotic supplements marketed for BV relief at pharmacies, but none of these are clinically proven to cure the infection. BV is caused by an overgrowth of certain bacteria that displace the healthy lactobacillus species in the vagina. Restoring that balance requires antibiotics that target the overgrown bacteria directly. Over-the-counter products may temporarily mask the odor or discharge, but the underlying bacterial imbalance remains. If you suspect BV, a prescription is the only reliable path to clearing it.
BV During Pregnancy
BV during pregnancy is typically treated with the same antibiotics, primarily oral metronidazole or oral clindamycin. Treatment matters because untreated BV during pregnancy has been linked to preterm delivery and low birth weight. The vaginal gel forms and single-dose options like secnidazole are generally not the go-to choices during pregnancy, so your provider will likely recommend an oral course.
Why BV Keeps Coming Back
The most frustrating thing about BV is its recurrence rate. Between 50% and 80% of women experience a return of symptoms within 6 to 12 months of finishing antibiotic treatment. Researchers still don’t fully understand why recurrence is so common. Some contributing factors include having a new or multiple sexual partners, douching, and natural variations in vaginal bacteria that make some people more susceptible.
For people with frequent recurrences (three or more confirmed episodes in a year), providers sometimes recommend a longer suppressive course of vaginal metronidazole gel, used once or twice a week for several months after the initial treatment clears the infection. This approach can help extend the time between episodes, though it doesn’t guarantee BV won’t return.
Some women also try maintaining vaginal health between episodes with lactobacillus-containing probiotics, though evidence for this is mixed. The strongest strategy for reducing recurrence is completing your full antibiotic course as prescribed, even if symptoms improve partway through, and avoiding douching or other practices that disrupt vaginal pH.