Metronidazole Vaginal Gel for Bacterial Vaginosis (Zidoval)
Effective topical treatment for bacterial vaginosis: Learn about Zidoval gel usage, benefits, side effects, and more for quick symptom relief.
Metronidazole vaginal gel, commonly known as Zidoval, is a prescription antibiotic treatment specifically designed to address bacterial vaginosis (BV), a common vaginal infection caused by an imbalance in vaginal bacteria. This topical gel is applied directly inside the vagina, targeting the infection at its source while minimizing systemic side effects compared to oral antibiotics. Bacterial vaginosis affects many women, leading to symptoms like unusual discharge and odor, and Zidoval offers an effective solution with high cure rates.
About Metronidazole Vaginal Gel
Metronidazole vaginal gel belongs to the nitroimidazole class of antibiotics and is indicated for treating bacterial vaginosis in women. Unlike yeast infections or other vaginal issues, BV results from an overgrowth of harmful bacteria such as Gardnerella vaginalis, Mobiluncus spp., and Peptostreptococcus spp., displacing beneficial lactobacilli. Zidoval restores the natural vaginal flora by interfering with bacterial DNA, halting their reproduction.
Symptoms of BV include thin, grayish-white vaginal discharge with a strong fishy odor, especially after intercourse; vaginal itching or burning during urination; and sometimes no symptoms at all. If untreated, BV can increase risks of pelvic inflammatory disease, preterm birth in pregnancy, or susceptibility to STIs.
How Does Metronidazole Gel Work?
The gel works by entering bacterial cells and damaging their DNA, preventing growth and multiplication of BV-causing pathogens. Applied intravaginally, it delivers high concentrations directly to the infection site, achieving better tolerance than oral forms. Clinical studies show it eliminates BV in up to 91% of cases.
How Long Does It Take to Work?
Symptom improvement often begins within 2-3 days, with full effects by the end of the 5-day course. Complete the full treatment to prevent recurrence, even if symptoms resolve early. Cure rates reach 84-87% within 1-3 weeks post-treatment.
Key Benefits of Zidoval
- High Efficacy: Clears infection in 91% of users, comparable to oral metronidazole (84-85%).
- Localized Action: Fewer gastrointestinal side effects than tablets.
- Convenient: Once-daily application for 5 days using a pre-filled applicator.
- Safe for Most: Suitable alternative for those unable to take oral meds.
Dosage and Administration
The standard regimen is one full applicator (5g of 0.75% gel) inserted vaginally once daily at bedtime for 5 consecutive days. Avoid washing the vagina for at least 6 hours post-application to ensure absorption.
Step-by-Step Instructions
- Wash hands thoroughly.
- Remove applicator cap and applicator from the tube.
- Screw applicator onto tube and squeeze to fill to the marked line.
- Unscrew applicator, lie on back with knees bent, and gently insert deep into vagina.
- Push plunger to release gel, then discard applicator.
- Avoid intercourse or tampons during treatment.
Note: Not for oral use. Consult a doctor for personalized dosing, especially if pregnant or breastfeeding.
Table: Comparison of BV Treatments
| Treatment | Active Ingredient | Dosage | Duration | Cure Rate |
|---|---|---|---|---|
| Metronidazole Gel (Zidoval) | Metronidazole 0.75% | 5g intravaginally daily | 5 days | 84-91% |
| Metronidazole Tablets | Metronidazole | 500mg orally 2x/day | 7 days | 85% |
| Clindamycin Cream | Clindamycin 2% | 5g intravaginally at bedtime | 7 days | ~70-85% |
| Dalacin Cream | Clindamycin phosphate | Intravaginal applicator | 3-7 days | High |
| Fluomizin | Dequalinium chloride | Vaginal tablets | 6 days | Effective |
Side Effects
Common side effects are mild and localized: vaginal yeast infections (due to disruption of good bacteria), candidiasis symptoms like itching or thick discharge; vulvovaginal candidiasis; headache; nausea; and metallic taste. Serious effects are rare but include allergic reactions (hives, swelling), severe dizziness, or seizures—seek immediate medical help.
- Frequent (>10%): Vaginal yeast infection.
- Less Common: Burning, discharge, pelvic pain.
- Rare: Hypersensitivity, peripheral neuropathy with prolonged use.
Using metronidazole gel may increase yeast infection risk; OTC antifungals can treat this.
Cautions and Contraindications
Avoid if allergic to metronidazole or nitroimidazoles, during first trimester pregnancy (Category B later), active liver disease, or with disulfiram/alcohol (within 48 hours—causes severe nausea). Not for yeast, trichomoniasis, or viral infections. Inform doctor of blood disorders, Cockayne syndrome, or upcoming exams using radiation/methylene blue.
Pregnancy and Breastfeeding
Use only if benefits outweigh risks; topical form preferred over oral. Minimal systemic absorption reduces milk transfer, but pump and discard during/24 hours post-treatment.
Interactions
- Alcohol: Avoid for 48 hours post-treatment.
- Warfarin: Monitor INR.
- Lithium/Busulfan: Potential toxicity.
Who Cannot Use It?
- Hypersensitive to metronidazole.
- First trimester pregnancy.
- Acute porphyria.
- With disulfiram.
When Not to Use
Do not use for fungal/yeast infections, urinary tract infections, or without BV diagnosis. Stop if no improvement after 5 days; seek re-evaluation.
Recurrent BV Management
For frequent recurrences, extended regimens like oral metronidazole followed by boric acid or suppressive gel twice weekly for 4-6 months may help. Promote lactobacilli recolonization.
Frequently Asked Questions (FAQs)
Can I have sex while using metronidazole gel?
Avoid intercourse during treatment to allow proper absorption and prevent spreading infection.
Does it cure BV permanently?
It treats current infections effectively (84-91%), but BV recurs in 30-50%; lifestyle factors influence prevention.
Is metronidazole gel safe during pregnancy?
Generally safe after first trimester; consult healthcare provider.
What if I miss a dose?
Apply as soon as remembered; resume schedule. Do not double dose.
Can it cause yeast infections?
Yes, in some cases; treat with antifungals if symptoms appear.
How to prevent BV recurrence?
Avoid douching, use condoms, wear cotton underwear, and maintain vaginal pH balance.
About Bacterial Vaginosis
BV is the most common vaginal condition in women 15-44, diagnosed by Amsel criteria (3/4: thin discharge, clue cells, pH >4.5, fishy odor). Risk factors: multiple partners, douching, smoking. Untreated BV links to STIs, infertility.
Alternatives to Zidoval
See comparison table above. Options include oral metronidazole, clindamycin cream, or single-dose gels like Nuvessa (1.3%).
References
- Bacterial Vaginosis Treatment with Metronidazole Gel — Superdrug Online Doctor. 2023. https://onlinedoctor.superdrug.com/metronidazole-gel.html
- Metronidazole Vaginal Gel 0.75% Label — U.S. Food and Drug Administration (FDA). 2005-08-29. https://www.accessdata.fda.gov/drugsatfda_docs/label/2005/021806lbl.pdf
- Bacterial Vaginosis STI Treatment Guidelines — Centers for Disease Control and Prevention (CDC). 2021-07-22. https://www.cdc.gov/std/treatment-guidelines/bv.htm
- Metronidazole (Vaginal Route) Description — Mayo Clinic. Accessed 2026. https://www.mayoclinic.org/drugs-supplements/metronidazole-vaginal-route/description/drg-20064738
- Metronidazole Vaginal Gel Uses & Side Effects — Cleveland Clinic. Accessed 2026. https://my.clevelandclinic.org/health/drugs/20304-metronidazole-vaginal-gel
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