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Metronidazole tablets

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What is Metronidazole?

Metronidazole, sold under the brand name Flagyl, is an antibiotic effective against bacterial and parasitic infections (protozoal).

Since its approval in 1960 in France, Metronidazole has been used widely throughout Europe to effectively treat various infections.

euroClinix offers Metronidazole as 400 mg tablets specifically for bacterial vaginosis and trichomoniasis. Bacterial vaginosis is a common vaginal infection that can cause symptoms like a strong odour and a change in vaginal discharge. Trichomoniasis is an STI caused by the parasite trichomonas vaginalis, a protozoan infection.

How does Metronidazole work?

Containing the active ingredient of the same name, Metronidazole works by directly attacking the bacteria or virus you are infected with. Metronidazole is used primarily for some bacterial and parasitic infections.

When this medicine is taken, it disrupts the DNA of the harmful organisms, causing them to die. Because it kills these germs directly rather than just stopping their growth, this medicine is effective in treating anaerobic infections like bacterial vaginosis and trichomoniasis, which thrive in low-oxygen environments.

By removing the infection at the source, Metronidazole not only offers relief from symptoms, but effectively cures your condition.

What are the benefits of Metronidazole?

Metronidazole tablets have many uses and offer various health benefits. Here are some of the most notable:

  • Targets infections directly - kills harmful bacteria and parasites directly, curing the infection at the source.
  • Treats bacterial and parasitic infections - effective both for bacterial infections, such as bacterial vaginosis, and parasitic infections, such as trichomoniasis.
  • Symptom relief - helps relieve symptoms like unusual discharge, itching and painful urination.
  • Reduces the risk of complications - by treating your infection, you reduce the risk of complications such as pelvic inflammatory disease and infertility.

How effective is Metronidazole?

Metronidazole has been clinically proven to be an effective treatment for various bacterial and parasitic infections. It has been found to be especially effective in the treatment of bacterial vaginosis and trichomoniasis.

Effectiveness of metronidazole 400 mg:

  • Bacterial vaginosis - one clinical study found this treatment to be 88% effective in the treatment of bacterial vaginosis*.
  • Trichomoniasis - one clinical review found this treatment to be 89% effective in the treatment of trichomoniasis vaginalis.

*Among patients not using an intrauterine contraceptive device (IUD).

Efficacy of Metronidazole

Treatment of bacterial vaginosis

Treatment of trichomoniasis

Who can and cannot take Metronidazole?

This medication may not be suitable for everyone. When you complete a consultation, our UK-registered doctors will be able to determine if this medicine is safe for you.

Who can take it?

This medication is suitable for women suffering from bacterial vaginosis or men and women with trichomoniasis.

Who cannot take it?

You cannot take Metronidazole if you are allergic to the active ingredient or any other ingredient found in this medicine.

Signs of an allergic reaction include:

  • A rash
  • Problems breathing or swallowing
  • Swelling of the lips, face, throat or tongue

Cautions

In addition to this, there are some instances where the safety of this medicine will need to be determined in your consultation. Although not necessarily contraindications for Metronidazole, you should still tell one of our doctors if any of the following applies to you:

  • You have or have ever had a liver problem
  • You are having kidney dialysis
  • You have a disease of the nervous system

Please disclose your health status during your online consultation with euroClinix. Our doctor will evaluate whether this treatment is suitable for you and may adjust your medications if needed.

How do I take Metronidazole?

To use this medicine correctly, follow the dosage and treatment course our medical team prescribes. This ensures the drug's effectiveness and helps avoid side effects.

Follow these guidelines on how to take Metronidazole 400 mg tablets to ensure safe and effective treatment:

  • Swallow the tablets whole with a glass of water
  • Do not chew or crush the tablets
  • Complete the full course of treatment prescribed by your doctor*

*Your Metronidazole dosage and duration of treatment may differ depending on your condition and your individual circumstances. Finishing the full course prescribed ensures your treatment is safe and effective.

Consult the patient information leaflet sent with your order if you are unsure about how to take your tablets.

Dosage

Condition name Form Dosage For how long?
Bacterial vaginosi Oral tablet A 400 mg tablet twice daily 5-7 days
Vaginal gel 0.75% 5 grams (1 application) at bedtime 5 days
Trichomoniasis Oral tablet A 400 mg tablet twice daily 5-7 days
Vaginal gel 0.75% 5 grams (1 application) at bedtime 5 days

When should I take it?

Oral Metronidazole should be taken during or just after a meal. This will reduce the risk of gastrointestinal side effects like nausea or stomach pain.

What if I miss a dose?

If you miss a dose, take your tablet as soon as you remember and carry on like before. However, if it is almost time for your next dose, skip the forgotten dose and continue your treatment as usual.

Do not take a double dose to make up for a missed one.

How long does it take for Metronidazole to work?

Whether you are treating bacterial vaginosis or trichomoniasis, improvement in your symptoms should be seen within a few days.

However, it usually takes up to 7 days for the infection to be completely cleared. You must complete the entire course prescribed to ensure effectiveness of treatment.

The half-life of Metronidazole is approximately 8 hours. However, it takes roughly 44 hours for the medicine to be completely cleared from the body.

What lifestyle changes should I make while taking Metronidazole?

Metronidazole is one of the most effective treatments for bacterial infections, but there are some lifestyle changes you can make to increase its effectiveness further.

Lifestyle changes when taking Metronidazole

Avoid caffeine

Avoid caffeine when taking Metronidazole and for 48 hours after finishing your course Caffeine can make side effects worse, such as:

  • Nausea
  • Vomiting
  • Stomach pain

Avoid certain foods

Some foods can cause gastrointestinal side effects.

When taking Metronidazole:

  • Stick to simple, non-spicy foods
  • Take your medication with food

Rest and manage stress

Making sure you get a good night's sleep and managing stress levels can allow your body to fight the infection more effectively.

Try the following to manage stress:

  • Get at least 8 hours of sleep every night
  • Try meditation or mindfulness exercises
  • Maintain an exercise routine

Focus on a balanced diet rich in fiber, vitamins, and minerals, which can help maintain gut health and overall wellness while you recover from your infection.

Silvia Fonda Nutritionist

What are Metronidazole’s side effects?

As with all prescription medications, side effects can occur as a result of taking your tablets. These will usually go away after a few days. Make sure you inform your doctor if they persist or become unmanageable.

Side effects with an unknown frequency
  • Nausea or vomiting
  • Feeling depressed
  • Numbness or tingling
  • Unpleasant taste in the mouth
  • Hair-like coating on your tongue
  • Loss of appetite
  • Fever
  • Eye pain
  • Loss in hearing
  • Ringing in the ears
  • Skin rash or discolouration
  • Thrush
Very rare side effects (affects less than 1 in 10,000 people)
  • Hallucinations
  • Fits (convulsions)
  • Blurred or double vision
  • Headache
  • Liver problems
  • Dark urine
  • Muscle or joint pain

How to manage side effects

The most common side effects are gastrointestinal and are unlikely to be a cause for concern.

If you notice a yellowing of the skin or eyes, or your urine is darker than usual, this can be a sign of liver problems. Stop taking your medicine immediately if you experience this and contact your doctor.

Gastrointestinal side effects like nausea can be eased by taking your medicine during a meal and with a glass of water.

Dr. Caroline Fontana Lead Prescribing Doctor

What interacts with Metronidazole?

Some medicines may increase the risk of side effects or reduce the effectiveness of this treatment.

Tell your doctor about any medication you are taking, including the following:

  • Disulfiram (alcoholism medication) - psychotic reactions have been reported.
  • Warfarin (prevents blood clots) - Using both medicines may increase the potency of warfarin.
  • Lithium (mood stabiliser) - concurrent use may damage the kidneys.
  • Phenytoin (seizure medication) - may increase absorption of the medicine.
  • Certain cancer treatments (5-fluorouracil and busulfan) - Metronidazole can increase the toxicity of these treatments.
  • Ciclosporin (arthritis medication) - concurrent treatment can increase levels of ciclosporin in the blood.
  • Alcohol - Metronidazole and alcohol interact with each other; possibly causing severe side effects.

This list does not cover all possible interactions. For a comprehensive list, please visit the interactions checker on the BNF website.

What safety advice should be followed when taking Metronidazole?

Category Safety Advice
Alcohol Unsafe Do not drink alcohol when on this medication as it can cause severe side effects.
Pregnancy Consult your doctor This medication can be used when pregnant, but only when deemed necessary by your doctor.
Breastfeeding Consult your doctor Consult your doctor if you are breastfeeding as the medicine may pass into breast milk.
Driving Caution Driving is generally safe when taking this medication. However, do not drive if you experience side effects that impact your ability to drive.
Hydration Important Stay hydrated when taking this medicine to avoid side effects.

How should I store Metronidazole?

Follow these guidelines when storing Metronidazole:

  • Store below 25°C in the original packaging
  • Do not use this medicine after the expiry date
  • Keep this medicine out of the sight and reach of children
  • Do not throw away medicines via wastewater or household waste.*

*Take any unused medication to your local pharmacy for proper disposal. These measures help to protect the environment.

Can I buy Metronidazole without a prescription?

No, Metronidazole can only be obtained with a prescription from a licensed healthcare provider.

Prescriptions are necessary because they:

  • Ensure appropriate use for your specific condition.
  • Prevent potential misuse and associated health risks.
  • Allow for monitoring of side effects and interactions with other medications.

How do I buy Metronidazole online from euroClinix?

Ordering Metronidazole online from euroClinix is convenient.

Follow these simple steps:

  1. Complete a quick online consultation to check your eligibility.
  2. UK-registered doctors review your responses to ensure the medication is right for you.
  3. Upon approval, an e-prescription will be issued.
  4. Enjoy free delivery from our licensed pharmacy with tracking details.

Your privacy is our top priority. euroClinix uses secure, encrypted transactions and complies with UK medical standards to keep your information confidential.

Start your online consultation today to enjoy professional care from the comfort of your home.

Why should I choose euroClinix?

euroClinix is trusted by thousands of users in the UK for its safe and convenient service. Here’s why:

  • Experienced doctors manage your consultations and prescriptions.
  • Online consultations, swift approvals, and discreet doorstep delivery make ordering quick and convenient.
  • A supportive team is on hand to answer treatment-related questions or concerns.
  • Patients can manage their prescriptions hassle-free through our secure platform.

Join thousands who trust euroClinix for their healthcare needs and take control of your health today.

How much does Metronidazole cost?

The price of Metronidazole at euroClinix includes everything you need:

  • Free online consultation with our experienced doctors
  • Free prescription, if approved
  • Free delivery straight to your door

Our pricing is transparent, with no hidden fees. Order today and benefit from our complete, all-inclusive service.

What alternatives are available?

If Metronidazole is not right for you, there are other options available to treat your condition.

While Metronidazole is the only medicine offered for trichomoniasis, you can also use Fluomizin or Dalacin cream to treat bacterial vaginosis. Here is a helpful table comparing these treatments so you can make an informed decision regarding your treatment.

Medicine name Dosage(s) Active ingredient Form Effective in Effectiveness Price from
Metronidazole 400 mg Metronidazole Tablets A few days to a week Highly effective -
Dalacin 2% Clindamycin phosphate Cream Within 7 days Moderately effective -
Fluomizin 10 mg Dequalinium chloride Vaginal tablets Within 6 days Less effective -

Once you have decided on a treatment, simply fill out a consultation form at the top of this page. Once approved, your chosen medicine can be sent out and you can start getting better as soon as possible.

Metronidazole FAQs

Does Metronidazole contain penicillin?
Can you take paracetamol with Metronidazole?
How long after taking Metronidazole can I drink alcohol?
Can you use Metronidazole for UTIs?
Can I treat a bladder infection with Metronidazole?
Can Metronidazole make you tired?
Can metronidazole cause thrush?
Are there any discounts for new users?
Is it safe to order online?
Will my order be confidential?
What are the delivery options available?

Note: You must complete a short online consultation so that our doctor can ensure that the treatment is suitable for you. The above pricing should only be used as a reference. The final decision to issue this treatment lies with the prescribing doctor.

Medically reviewed by Dr. Caroline Fontana Written by our editorial team Last reviewed 02-01-2025
Metronidazole information
Type of medicine Antibiotic
Used for Bacterial and parasitic infections
Active ingredient(s) Metronidazole
Works by Interfering with protein production in harmful bacteria or viruses, causing them to die
Effective within A few days, but the full course can take 7-10 days
Available as Tablets
Available dosage(s) 400 mg
Usage instructions Take a 400 mg tablet twice daily for 5-7 days
Packaging Blister packs containing 14 tablets
Manufacturer Various
Branded available No
Storage Store below 25°C in the original packaging
Prescription required? Yes, get it with our FREE online consultation
Who is suitable for an online consultation* Adults with bacterial vaginosis or trichomoniasis

*Note: Our medical team must review your online consultation before approving this treatment. They will determine if the requested treatment and quantity are safe, appropriate, and effective for you.

Metronidazole reviews
Pack containing 21 tablets of Metronidazole 400mg Excellent 4.8 66 patients have reviewed Metronidazole on Trustpilot
08 May

Product works quite well, the only one downside - it is on the expensive side. If you end up using highest dosage, it’s £75 for a week of treatment...

Aldis
07 Mar

One day in to course and huge improvement. Hope this is what I think at end of course.

Rob from Bothwell

Further reading

Metronidazole side effects & how to manage them

Metronidazole side effects & how to manage them

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