The most commonly prescribed treatment for bacterial vaginosis (BV) is metronidazole, available as either an oral pill or a vaginal gel. A second option, clindamycin, works through a different mechanism and comes as a vaginal cream. Both are effective first-line treatments, and the choice between them often depends on your preferences and whether you’d rather take a pill or use a topical product.
Oral Metronidazole
The standard prescription is metronidazole 500 mg taken by mouth twice a day for seven days. This is the most widely used BV treatment and has decades of clinical data behind it. It works by killing the overgrowth of anaerobic bacteria that causes BV symptoms like discharge, odor, and irritation.
The main drawback is the alcohol restriction. You need to avoid drinking for the entire course of treatment and for at least 72 hours after your last dose. Combining metronidazole with alcohol can trigger severe nausea, vomiting, rapid heartbeat, and facial flushing. Other common side effects include a metallic taste in the mouth, mild nausea, and digestive upset, though most people tolerate it well.
Metronidazole Vaginal Gel
If you’d rather avoid an oral antibiotic, metronidazole also comes as a 0.75% vaginal gel. The typical prescription is one full applicator (5 grams) inserted into the vagina once daily for five days. Because the medication is applied directly where it’s needed, it tends to cause fewer digestive side effects than the pill. The alcohol restriction still applies, though the risk of a reaction is lower with the vaginal form.
Clindamycin Vaginal Cream
Clindamycin cream is the main alternative when metronidazole isn’t a good fit. It’s available as a pre-filled applicator containing 5 grams of cream, inserted into the vagina. Some formulations are designed as a single-dose, one-day treatment, which makes it especially convenient.
One important note: clindamycin cream can weaken latex condoms and diaphragms for up to 72 hours after use. If you rely on barrier contraception, you’ll need a backup method during and shortly after treatment.
Single-Dose Options
For people who struggle with multi-day regimens, secnidazole (brand name Solosec) offers a true one-and-done treatment. It’s a single 2-gram dose of granules that you sprinkle onto soft food like applesauce, yogurt, or pudding and eat within 30 minutes. That’s the entire course of treatment.
Secnidazole belongs to the same drug class as metronidazole but stays active in the body much longer, with a half-life of about 17 hours compared to metronidazole’s eight. A clinical trial of 577 women found that one dose of secnidazole produced results comparable to the full seven-day course of oral metronidazole. The trade-off is cost: secnidazole is significantly more expensive than generic metronidazole, and insurance coverage varies.
Treatment During Pregnancy
BV during pregnancy is treated with the same medications. Oral metronidazole (500 mg twice daily for seven days) and metronidazole vaginal gel are both options that providers commonly prescribe for pregnant patients. Your provider will weigh the risks and benefits based on your trimester and individual situation, since untreated BV during pregnancy has been linked to preterm birth and other complications.
What About Recurrent BV
BV comes back within 12 months for roughly half of people who get it. When it keeps recurring, providers often prescribe an initial treatment course followed by a longer maintenance phase. This typically means using metronidazole vaginal gel on a reduced schedule (such as twice a week) for several months to keep the bacterial balance in check. The goal is to give your vaginal microbiome enough time to re-establish a healthy population of protective bacteria.
There’s growing interest in probiotics as a way to support recovery after antibiotic treatment, particularly strains of Lactobacillus crispatus, the dominant “good” bacteria in a healthy vaginal environment. Clinical trials are currently testing whether vaginal probiotic tablets containing multiple L. crispatus strains can reduce recurrence when used alongside standard metronidazole treatment. These products aren’t yet part of standard guidelines, but the research is active.
Boric Acid Suppositories
You’ll find boric acid vaginal suppositories widely marketed online for BV, but the evidence is limited. Boric acid may offer some benefit for resistant or recurrent infections when combined with a prescription antibiotic, but on its own, prescription treatments are more effective and actually safer. The clinical studies that do exist used pharmacy-compounded boric acid, not the commercially available products you’d buy online, so those retail formulations haven’t been proven to deliver consistent results. Boric acid is not a substitute for antibiotics when you have active BV symptoms.
Choosing Between Oral and Vaginal Treatment
All the first-line options have similar cure rates, so the choice comes down to practical factors. Oral metronidazole is simple to take but requires a full week of twice-daily pills and strict alcohol avoidance. Vaginal gel or cream causes fewer systemic side effects but requires nightly application. Secnidazole is the easiest to complete but the hardest on your wallet.
If you’ve had BV before and recognized the symptoms, your provider may be willing to call in a prescription based on your history. If it’s your first time or your symptoms are unusual, they’ll likely want to confirm the diagnosis with a vaginal swab before prescribing, since the symptoms of BV overlap with yeast infections and other conditions that require different treatment.