Written by: Precious Eze
Medically Reviewed by: Dr. Deborah Akinlola
Last reviewed: April 6, 2026
Yes, it can.
Metronidazole can be followed by a yeast infection in some people. It treats certain bacterial infections, including bacterial vaginosis, but it does not treat yeast infections. Some people develop thrush after taking metronidazole. This can be more common with the vaginal gel, as the NHS explains. The Mayo Clinic also notes that metronidazole will not work for vaginal fungus or yeast infections.
So if you took metronidazole for BV and then developed itching, burning, soreness, or thick white discharge, you may now be dealing with a yeast infection instead. Common symptoms include itching, soreness, pain during sex, pain with urination, and abnormal discharge, according to the CDC’s vulvovaginal candidiasis guidance.
In this Article
Quick answer
- Can metronidazole cause a yeast infection? Yes, it can happen in some people.
- Does metronidazole treat yeast infection? No.
- Why can this happen? Antibiotics can disturb the normal vaginal balance and make yeast overgrow.
- What symptoms suggest yeast after metronidazole? Itching, burning, soreness, swelling, and thick white discharge.
- What should you do? Don’t guess. If you’re unsure whether it’s BV or yeast, get checked.
What metronidazole is for
Metronidazole is used to treat certain bacterial and parasitic infections. In vaginal care, it’s commonly used for bacterial vaginosis. The Mayo Clinic explains that metronidazole vaginal gel treats vaginal bacterial infections such as BV. While the NHS overview of metronidazole notes that it’s used for a range of infections caused by bacteria and parasites.
This distinction is important because BV and yeast infection are not the same thing. They can feel similar, but the cause and treatment are different, as explained more fully in this guide to bacterial vaginosis: symptoms, causes, treatment, and prevention.
Why metronidazole can be followed by yeast symptoms
Your vagina has a natural balance of bacteria and yeast. When that balance shifts, yeast can grow too much. Antibiotics can kill helpful bacteria in the vagina and make yeast infection more likely, as the Cleveland Clinic explains. The Mayo Clinic also notes that antibiotics can reduce healthy bacteria that normally help control yeast.
This doesn’t mean metronidazole causes yeast infection in everyone. It means it can happen. This fits the broader pattern already discussed in can antibiotics cause a yeast infection?.
Does metronidazole treat a yeast infection?
No, it doesn’t.
Metronidazole treats bacterial infections. It does not treat fungal infections such as vaginal yeast infection. The Mayo Clinic states this directly, and the Cleveland Clinic’s metronidazole vaginal gel page says the same thing.
So if your real problem is yeast, metronidazole won’t fix it. In some cases, the original infection may improve, but a new yeast infection may show up afterward.
Signs you may have a yeast infection after metronidazole
You may be dealing with yeast if you notice:
- vaginal itching
- burning or soreness
- redness or swelling
- pain during sex
- pain or discomfort when urinating
- thick white discharge
Typical symptoms include vaginal itching, soreness, pain during sex, pain with urination, and abnormal discharge, as listed on the CDC’s signs and symptoms page for candidiasis. Many of these signs are also covered in more detail in this article on vaginal yeast infection: symptoms, causes, treatment, and prevention.
BV vs yeast infection after metronidazole
This is where many people get confused. If symptoms change during or after treatment, the pattern often gives a clue.
| Feature | Bacterial vaginosis | Yeast infection |
|---|---|---|
| Discharge | Often thin | Often thicker |
| Odor | Often fishy | Usually little or no odor |
| Itching | Less common | Common |
| Burning or soreness | Can happen | Common |
| Treatment | Antibiotics such as metronidazole | Antifungal treatment |
Symptoms can still overlap. The CDC notes that yeast symptoms are not specific on their own, which is why symptom pattern helps but does not confirm the diagnosis. For a closer look at the overlap, yeast infection vs BV vs STI: how to tell the difference breaks down where these symptoms can start to blur.
If symptoms start during treatment
If you start metronidazole and then feel more itching, burning, or vulvar soreness, yeast becomes one possible explanation. The NHS says some people get thrush after a course of metronidazole, especially with the vaginal gel.
Do not assume the medicine is failing. It may be treating the bacterial infection while a yeast infection starts at the same time.
If symptoms start right after treatment
This can happen too. Once the bacterial infection starts clearing, a changed vaginal balance may allow yeast to overgrow. The NHS explains that thrush can happen after metronidazole, while the Cleveland Clinic explains how antibiotics can shift the balance that usually keeps yeast under control.
If symptoms never improved at all
If you never felt any improvement, a few things may be going on:
- it may not have been BV in the first place
- it may be yeast, not BV
- you may have more than one issue at the same time
- you may need testing to confirm the cause
That’s why it’s risky to keep self-treating without knowing what’s actually causing the symptoms.
Can metronidazole gel cause yeast infection too?
Yes, it can.
Thrush can be more common when you use metronidazole vaginal gel, according to the NHS. Healthline’s metronidazole side effects explainer also lists vaginal yeast infection among the more common side effects of the gel.
So if you used the gel for BV and then became itchy or sore, don’t automatically assume the BV is still there.
What to do if you think you have yeast after metronidazole
Start with the symptoms. If they now sound more like yeast than BV, get proper advice before repeating treatment. The CDC says yeast symptoms are not specific on their own, so guessing can easily lead to the wrong treatment.
You may need:
- an antifungal cream or suppository
- an oral antifungal medicine, if appropriate
- testing to confirm whether it’s yeast, BV, or something else
If symptoms keep coming back, a clinician may need to rule out another cause.
When to see a doctor
See a doctor or qualified clinician if:
- this is your first suspected yeast infection
- symptoms are severe
- you are pregnant
- symptoms keep coming back
- you have pelvic pain, fever, sores, or bleeding
- the discharge is green, gray, or strongly foul-smelling
- treatment is not helping
- you are not sure whether it is BV or yeast
Not every vaginal symptom is caused by yeast or BV. Both can overlap with irritation, STIs, or other conditions. The CDC’s candidiasis guidance makes clear that symptoms alone are not enough for a certain diagnosis.
Can you prevent a yeast infection while taking metronidazole?
There is no guaranteed way to prevent it, but these steps may help:
- take the medicine exactly as prescribed
- avoid scented vaginal products
- avoid random self-treatment
- tell your doctor if you often get yeast infections after antibiotics
- get checked if symptoms change instead of assuming it is still BV
The best approach is to notice when the symptom pattern shifts and respond early.
The bottom line
Yes, metronidazole can be followed by a yeast infection in some people. It doesn’t treat yeast, and it may be linked to yeast overgrowth after treatment, especially if the vaginal balance changes. If itching, burning, soreness, or thick white discharge starts during or after metronidazole, yeast is one possible explanation. Both the NHS and the Mayo Clinic support this core distinction.
Don’t guess too quickly, though. BV and yeast can feel similar, but they are not treated the same way.
Medical disclaimer: This article is for educational purposes only and does not replace medical advice, diagnosis, or treatment. If you have severe symptoms, frequent infections, are pregnant, or are not sure what is causing your symptoms, speak with a qualified healthcare professional.
