Metronidazole
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Reviewed on Feb 17, 2026. by Dr Alexandra Cristina Cowell Writer & Clinical Content Reviewer Next review due on January 10, 2029.
Dr Alexandra Cristina Cowell

Last updated on Feb 17, 2026.

Twice-daily oral antibiotic for bad breath

Metronidazole is an oral antibiotic that treats halitosis caused by bacterial infections. It’s taken twice a day until your infection clears.

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500mg
$164.95
  • Prices include:
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    2-5 day shipping by secure courier

  • Consultation + Access to our clinicians

    Ask our experts anything you like, any time you want.

  • Total
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    Save $0.00 each order
Metronidazole Metronidazole

What is Metronidazole?

Metronidazole is an antibiotic that can treat halitosis, also known as bad breath. Bad breath isn’t usually a medical concern, as it’s often caused by poor oral hygiene.1 But when you have chronic halitosis, which is commonly caused by a bacterial infection, treatment is needed.

Metronidazole is prescribed off-label for halitosis, meaning that it hasn’t been approved yet by FDA for this condition. But there’s enough clinical data to show its safety and effectiveness.

How does Metronidazole work?

Metronidazole clears bacterial infections by inhibiting protein production. It does this by altering bacterial DNA, which stops proteins from being produced. Without protein, bacteria can’t survive and grow, which eventually leads to their expiry.2

Can you get side effects with Metronidazole?

Metronidazole can cause side effects, but not everyone will get them. You might get side effects like headache, dizziness, muscle pain, or sleepiness, but these tend to be rare.

Most people find Metronidazole tolerable, but if you find it hard to manage or experience any serious side effects listed in the package insert, let your doctor know right away.

Is alcohol safe to drink while taking Metronidazole?

No, you shouldn’t drink alcohol while taking Metronidazole. Alcohol can result in unwanted side effects like nausea and dizziness. It may also affect Metronidazole’s ability to treat infections. As a result, you should wait 48 hours to drink alcohol after taking Metronidazole.

What doses of Metronidazole are there?

Metronidazole comes in a 500 mg tablet. It’s taken twice a day with food until your infection clears. Your doctor will give you more information on how long you need to take it for.

Treated trusted source:

  1. Khounganian, R. M., et al. (2023). Causes and Management of Halitosis: A Narrative Review. Cureus, 15(8), e43742.
  2. Weir, C.B. and Le, J.K. (2023). Metronidazole. Nih.gov.
Dr Alexandra Cristina Cowell
This page was medically reviewed by Dr Alexandra Cristina Cowell on January 09, 2026. Next review due on January 10, 2029.

How we source info.

When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.

Metronidazole Metronidazole

How to take Metronidazole

Swallow Metronidazole whole with water, around the same time each day. Take it with food to reduce your risk of side effects.

 

Dr Alexandra Cristina Cowell
This page was medically reviewed by Dr Alexandra Cristina Cowell on January 09, 2026. Next review due on January 10, 2029.

How we source info.

When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.

Metronidazole Metronidazole

Metronidazole isn’t suitable for everyone, and there are some things that you need to be aware of when taking it.

Here’s all the official info on it. If anything is unclear, let our doctor know, and they can talk with you about it.

Metronidazole Metronidazole

Metronidazole: FAQ

Have something specific you want to know? Search our info below, or ask our experts a question if you can’t find what you’re looking for.

How long does Metronidazole take to work?

Answer:
Metronidazole is absorbed quickly, reaching peak concentration between 20 minutes and three hours.1 While it begins to work fast, it might take a week or more for the infection to completely clear.

It’s important to complete your antibiotic course. Leaving it incomplete can cause the infection to return and potentially make it harder to fight.

Can you take Metronidazole while pregnant or breastfeeding?

Answer:
No, you should avoid taking Metronidazole during pregnancy unless it’s absolutely necessary, as it may harm your baby.

Similarly, it should be avoided while breastfeeding, as a small amount can pass into breast milk and potentially harm your child.

Is Metronidazole an antibiotic?

Answer:
Yes, Metronidazole is an antibiotic that treats bacterial infections. Sometimes, halitosis can be caused by a fungal infection or another underlying condition. Depending on the cause of your bad breath, the medication may vary. Metronidazole can only be used to treat halitosis that results from bacteria.

Can I get Metronidazole through private health insurance?

Answer:
It depends on your private insurance plan. Certain insurers only cover specific medications, so it’s always best to ask your provider whether they cover your preferred treatment.

If it isn’t covered, you can always get Metronidazole from an online service at your own expense.

Treated trusted source:

  1. Flamingo Pharma. (2025). Metronidazole 200 mg Film-Coated Tablets – Summary of Product Characteristics (SmPC) – (emc).

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