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Metronidazole 400mg Tablets

*The brand supplied may vary. Please contact us if you require a specific brand.

Metronidazole 400mg Tablets (14 tablets)

Order before 3pm for delivery from Fri. 18 Jun and Mon. 21 Jun.

Antibiotic Treatment for Bacterial Vaginosis

If you’ve been diagnosed with Bacterial Vaginosis (also known as BV), the good news is that it’s now possible to purchase treatment quickly and discreetly online. The Independent Pharmacy is the safe and easy way to buy Bacterial Vaginosis medicine online, at a competitive price. Simply start our quick, free online consultation to order your Metronidazole tablets direct from our UK-based pharmacy today.

A week course of Metronidazole 400mg tablets is the first-line remedy for women with uncomplicated Bacterial Vaginosis (BV). When taken twice daily at a dose of 400mg for one week they can clear up most cases of BV quickly and effectively. Metronidazole tablets are a prescription-only medicine meaning you will have to complete our brief online consultation before purchasing. This allows one of our trained doctors and pharmacists to review and ensure you are receiving the correct treatment for your BV.

Metrondiazole for BV - Important Information

  • Age: 18 Years +

    Maximum per order: 2

  • Pregnancy: Not suitable

    Breastfeeding: Not suitable

How does Metronidazole work?

Metronidazole 400mg tablets are a type of antibiotic. Bacterial vaginosis is thought to be caused by a change in the natural balance of bacteria that live in the vagina. Metronidazole helps to kill some of the excess bacteria that occur in BV and return the balance of bacteria to normal.

Metronidazole (also spelled Metronidazol) can be used to treat a number of different infections however, it can be supplied online by The Independent Pharmacy to treat Bacterial Vaginosis (BV) in women. It is an effective BV treatment, that can typically clear symptoms in two to three days and should be taken for the full one week course.

Find out more in our ‘What is metronidazole used for?’ guide.


Treating bacterial vaginosis online

Metronidazole is suitable to buy online if you have previously suffered from bacterial vaginosis before that has been diagnosed and successfully treated by your GP.

You may qualify for BV treatment online if you have had it:

  • Diagnosed by your doctor before or have had a positive home test for bacterial vaginosis
  • Been prescribed Metronidazole and it has treated the infection successfully
  • Your symptoms include fishy odour and may include a thin discharge

If you have not suffered from BV before, your symptoms are not typical of BV or you have had a negative test result, you should see your GP or local sexual health clinic for further investigation.

If you are not sure whether your symptoms are caused by bacterial vaginosis, you can use a Canestest Home Kit to correctly diagnose your symptoms. Vaginal discharge and odour can be caused by a number of different infections, including STIs, so it's important to make sure you are receiving the correct treatment for your condition.


Metronidazole for bacterial vaginosis

Bacterial vaginosis is not a sexually transmitted disease and normally presents as white, grey or yellow vaginal discharge that is thin and watery – not to be confused with thrush. It may have a 'fishy' smell that is particularly strong after sex. To find out more about the condition, see our Bacterial Vaginosis treatment page.

BV does not usually cause a rash or lesions – if you experience these symptoms, this could be a sign of genital herpes, while small bumps could be a sign of genital warts. It is not normally associated with any pain or inflammation of the vagina.

BV is also different from a yeast infection (thrush) caused by the candida fungus —  and vaginal yeast infections have their own specific treatments. You can suffer from BV and a yeast infection at the same time, however, to be sure you should consult a doctor or you can contact us for free impartial advice if you suspect you have more than one infection.

Metronidazole tablets can also be used to treat recurrent bacterial vaginosis. It is not uncommon for BV to return within three months of first treatment. As long as your symptoms fully cleared after the first course of metronidazole was completed and your symptoms are the same, treating a repeat BV infection with metronidazole is fine. If you have BV more than twice in 6 months or 4 times in 12 months, you should see your GP or sexual health clinic for investigation.


Other treatment options for BV

Metronidazole is the only oral option for treating bacterial vaginosis, however, there are other treatments available:

  • Zidoval is a vaginal gel that contains metronidazole. The gel is inserted into the vagina daily for 5 days and treats the infection locally. It is a prescription-only treatment that can be purchased after a short online consultation.
  • Balance Activ BV gel is a non-prescription alternative to treat BV. It helps to lower the pH of the vagina, making conditions more favourable for the regular bacteria that normally live in the vagina to flourish. It can be used alongside Metronidazole.



*Prescription medicines are supplied subject to a medical consultation at the discretion of a doctor.

How to take Metronidazole for BV treatment

Take ONE tablet TWICE daily for SEVEN days. Metronidazole should be taken with or after food.

Always ensure that you complete the course, even if you think your symptoms have improved. This will help to prevent the infection coming back.

You should avoid alcohol whilst taking Metronidazole and for at least 48 hours after your course has finished. Alcohol can cause a serious interaction with Metronidazole that results in nausea and vomiting.

Metronidazole can interact with alcohol - you should avoid alcohol whilst you are taking Metronidazole and for 24 hours after you have completed the course.

Read more about Metronidazole and alcohol here.

Metronidazole side effects

Side effects when taking Metronidazole do not affect everyone, however there is always a chance that any of the effects listed below could occur. Side effects are less likely at lower doses (such as the dose for Bacterial Vaginosis) and when it is taken with or after food.

Side effects of unknown frequency:

  • Numbness, tingling, pain, or a feeling of weakness, in the arms or legs
  • Unpleasant taste in the mouth
  • Furred tongue
  • Feeling sick (nausea), being sick (vomiting), upset stomach, or diarrhoea
  • Loss of appetite
  • Fever
  • Feeling depressed
  • Pain in your eyes (optic neuritis)

Rare side effects include:

  • Anaphylactic reactions
  • Abnormal laboratory test results
  • Blood and bone marrow problems - these may be fatal
  • Brain and central nervous system problems including neurological problems. Seek medical advice if you have symptoms such as fever, paralysis, photosensitivity, balance or coordination problems, stiff neck, tremors or epileptic seizures
  • Convulsions
  • Double vision
  • Eye or eyesight problems
  • Feeling dizzy
  • Feeling drowsy
  • Flushing
  • Headaches
  • Itching
  • Jaundice
  • Joint pain
  • Liver problems
  • Muscle pain or tenderness
  • Myopia
  • Pancreatitis
  • Psychotic problems including confusion and hallucinations
  • Skin problems
  • Skin rash
  • Urine colour changes

If you experience any of the side effects, you should contact your doctor for further advice. 

You can find out more detail about the chances of experiencing any of the above in our in-depth guide to Metronidazole side effects.

Metronidazole ingredients

The active ingredient in this medicine is metronidazole 400mg.

The other ingredients are: Croscarmellose Sodium, Cellulose, Colloidal Silica, Lactose, Magnesium Stearate, Maize Starch, Polyethylene Glycol, Titanium Dioxide (E171), Hydroxypropylcellulose (E463), Methylhydroxypropylcellulose (E464).

Metronidazole warnings

You should not take Metronidazole tablets if any of the following apply to you:

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

You should not take Metronidazole tablets if you take any of the following medicines:

  • Anti-coagulants (blood thinning agents), such as warfarin. The dosage of warfarin may need to be reduced if you are taking Metronidazole.
  • Lithium - if taken at the same time as metronidazole, the kidneys may be affected.
  • Medicines used to treat epilepsy (e.g. phenytoin, primidone, phenobarbitone).
  • 5-fluorouracil (for cancer).
  • Disulfiram (for alcohol abuse)
  • Cimetidine (for indigestion and heartburn)


Metronidazole & alcohol

You should not drink alcohol during your course of Metronidazole tablets and for 48 hours afterwards. The combination of Metronidazole and alcohol can cause unwanted side effects such as nausea, vomiting, flushing, stomach pain, palpitations and headache.


Metronidazole & contraception

Metronidazole may alter the effectiveness of your contraceptive pill. Additional precautionary measures may be necessary whilst you are taking Metronidazole.


Metronidazole & pregnancy

Metronidazole is used for vaginal infections, for which pregnant women may sometimes require treatment, just like any other. The risk of miscarriage while using Metronidazole is thought to be unlikely. There’s no scientific proof that says Metronidazole is harmful to an unborn baby, but because it’s not been fully studied, it’s not possible to say for sure that it’s absolutely safe to use while pregnant. You should always consult your doctor if you have a vaginal infection during pregnancy.

Delivery & Shipping Information

Please note that due to the current situation with COVID-19, Royal Mail are experiencing some delays. This may mean that your order takes longer to arrive than you would normally expect. We are working hard to ensure that, where possible, all orders placed before 15:00 are still dispatched the same working day.


UK Orders

We offer FREE standard tracked delivery on orders over £40.

The following delivery options are available:

  • Standard Tracked Delivery - 2 - 3 day delivery - £2.95
  • Express Tracked Delivery - 1 - 2 day delivery - £4.45
  • DPD Next Day - 1 - 2 working days - £6.95
  • Special Delivery (Guaranteed before 21:00) - £8.95
  • Saturday Guaranteed before 21:00 - £10.45

Important Delivery Information

All our orders are sent out using Royal Mail (unless stated). We always aim to dispatch all Royal Mail & DPD orders received before 15:00 the same working day. Any orders received after 15:00 or over the weekend will be dispatched the next working day. Orders will not be dispatched on weekends or bank holidays.

All orders are subject to approval by our team of doctors and pharmacists. Your delivery date in the checkout is subject to your consultation being approved by our healthcare team.

All orders can be fully tracked from your dispatch email, in your online account and from any notifications from your courier.

We ensure all parcels are in plain packaging for discreet delivery of your medicines and pharmacy goods. Where possible, we will attempt to size all parcels to fit through your letterbox in tamper-proof packaging. By placing an order on our website, you confirm that it is safe and appropriate for a package containing medicines to be posted through your letterbox, if the carrier is able to do so. You should notify our customer support team if it is not safe for the package to be posted through the letterbox, for example due to animals or small children.

Deliveries containing pharmacy-only or prescription medicines may require a signature on receipt. 

Delivery is free for all NHS prescriptions.


Royal Mail


  • Fully tracked delivery
  • SMS & email notifications
  • Four-hour delivery window
  • Change delivery date directly with Royal Mail
  • Update delivery location - add a Safeplace, preferred neighbour, or update your delivery location to a local Post Office or Royal Mail Customer Service Point.

Royal Mail are the most widely recognised mail delivery company in the UK. Being on the UK’s 29 million doorsteps six days a week means they offer unparalleled price and convenience. The Independent Pharmacy uses Royal Mail’s Tracked 48, Tracked 24, and Special Delivery Guaranteed parcel services to offer reliable, fully-tracked delivery at very competitive prices. Your Royal Mail parcel will arrive with your normal daily delivery of post.

Please note: Royal Mail do not deliver on Sundays or Bank Holidays - this should be taken into account when ordering. 

If you are not home to accept your delivery, a card should be left by the Royal Mail representative. This card will provide details of where you can collect the order or how to arrange re-delivery.

Should you be unable to collect your missed delivery or arrange for your medication to be redelivered by Royal Mail, the pharmacy can resend your medication to the same, or a different address provided it has been returned to us and this happens within a 30 day window.

Once a package has been shipped with Royal Mail we advise that you are bound to the terms and conditions of their use together with the terms and conditions contained herein.

You have the right to cancel your order up to the point when your treatment is dispatched. The pharmacist must destroy any medication within 30 days of it being returned, even un-opened boxes, so we are not able to offer refunds once your treatment has been dispatched.




  • Fully tracked delivery
  • SMS & email notifications
  • One-hour delivery window
  • Change delivery date directly with DPD
  • Update delivery location - add a Safeplace, preferred neighbour, or update your delivery location to a local collection point.

DPD Local is the most innovative parcel carrier around. Thanks to their industry-leading Predict service, they provide parcel recipients with a one hour delivery window, notified by email, so you don't have to wait in all day. What's more, it enables receivers to watch the progress of their delivery on a real-time map, all the way down to a final 15 minute time-slot. 

As well as keeping customers informed at every stage of the journey, DPD believe in maximising choice and convenience. That's why DPD provide access to a suite of options both on the day of delivery and the night before, allowing customers to take delivery of their goods in a way that suits. If you wish to reschedule, you can:

  • Select an alternative delivery date
  • Opt for delivery to a nominated neighbour
  • Have the parcel left in a specified safe place
  • Collect the parcel from your local DPD Pickup Shop
  • Upgrade delivery to By 12

Please note: DPD do not deliver on Saturdays, Sundays or Bank Holidays - this should be taken into account when ordering. 

Once a package has been shipped with DPD we advise that you are bound to the terms and conditions of their use together with the terms and conditions contained herein.

You have the right to cancel your order up to the point when your treatment is dispatched. The pharmacist must destroy any medication within 30 days of it being returned, even un-opened boxes, so we are not able to offer refunds once your treatment has been dispatched.


Forwarding houses

We are unable to ship orders to mailing or forwarding houses for onwards shipping to locations outside of the UK.


BFPO Postcodes

Unfortunately we are unable to deliver medicines to BFPO postcodes.


Remote Areas

Please be aware that Royal Mail Guaranteed services are not available to all customers in the UK, especially those that live in remote postcodes. Royal Mail advise customers of the following:

We deliver by 17:30 the next working day in the following postcode areas:
AB30 - 39, 41 - 45, 51 - 56
GY9 Alderney (Channel Islands)
HS1, 3 - 9
IV21 - 28, 40 - 49, 51 - 56
KA27, 28
KW1 - 3, 5 - 15
KW16 Stromness Town only
PA20 (0&9)
PA28 - 38, 41 - 49, 76, 77
PH15, 17 - 26, 31 - 40, 49, 50


We deliver within two working days by 17:30 to the following postcodes areas:
GY1 Herm (Channel Islands)
GY9 Sark (Channel Islands)
PA60 - 75, 78
ZE2, 3


We deliver within three working days by 17:30 to the following postcode areas:
KW16 - non-Town
PH30, 41 - 44


Please note: This applies to our 'Special Delivery' and 'Saturday Guaranteed' services.


International Orders

We are currently unable to ship orders outside of the UK.

We are unable to ship orders to mailing or forwarding houses for onwards shipping to locations outside of the UK.

Need to know more about Bacterial Vaginosis (BV)?

Visit our advice area or contact our support team

Metronidazole 400mg Tablets Reviews

Unsure about a treatment?
Ask our medical team for impartial information and advice about any treatment we provide or medical condition that we treat before you buy.

Frequently Asked Questions

  • How many Metronidazole tablets do I need to take to treat Bacterial Vaginosis?

    Take 1 tablet twice a day for 7 days and ensure you complete the course. You will need 14 Metronidazole 400mg tablets in total for a full course of treatment.

  • Do I take the Metronidazole tablets with or after food?

    Metronidazole tablets can be taken with or without food. Some people feel sick or may be sick (vomit) when they take Metronidazole. If this happens, you should try to take the tablets with or after food. A metallic taste is a common side-effect when taking Metronidazole.

  • Can I take Metronidazole and drink alcohol?

    Do not drink any alcohol while taking Metronidazole.This is a well documented interaction that can cause vomiting, flushing or an increased heart rate. This advice also applies to items that contain alcohol like mouthwash. Allow 2 days for any trace of the antibiotic to clear out of your system before consuming any alcohol or alcohol containing products.

  • My symptoms have got better but haven't cleared completely. What do I do now?

    Some women may require an additional course of Metronidazole should the initial course be unsuccessful. This is quite normal. If you need another course of treatment, it is important to check if the initial course was taken correctly as this will influence the choice of the second course of treatment.

  • Will BV antibiotics interfere with my contraceptive pill?

    It was previously recommended that if you were taking antibiotics, that you use another form of contraception whilst taking the course and for 7 days after finishing. This advice has now been changed. Metronidazole, used to treat Bacterial Vaginosis, does not affect the contraceptive pill and no additional or precautionary contraceptive methods are necessary whilst treating BV.

  • Can I have sex whilst I am receiving treatment for BV?

    It is best to avoid sex until you have finished your course of treatment and your infection has completely cleared up. This is to avoid upsetting the pH balance in the vagina and worsening symptoms during treatment.

  • What should I do if I forget to take a Metronidazole tablet?

    Take the missed dose as soon as you remember unless it is nearly time for your next tablet.  Do not take two tablets to make up the missed dose.

  • Will Metronidazole affect my period?

    Since Metronidazole is only taken for a short amount of time, it should not have lasting or ongoing effects on your period.

    Antibiotics can affect a woman’s period, as one of the effects can be a reduced amount of oestrogen – the hormone responsible for your menstrual cycle. This is because antibiotics are metabolized by the liver, which is also responsible for metabolizing oestrogen and progesterone. Some women may experience a period delay, or your ovulation may occur later than normal.

  • What happens if Bacterial Vaginosis goes untreated?

    While unpleasant, BV does not usually cause other health problems to occur. But if it is left untreated, you may be vulnerable to an increased risk of STIs, such as herpes, chlamydia and gonorrhea. Untreated BV can also lead to pelvic inflammatory disease, where the uterus or fallopian tubes become infected. For this reason, it’s best to treat the symptoms as soon as they’re diagnosed.

  • Does Metronidazole have side effects?

    Metronidazole tablets (or capsules) can have some side effects. The most common may include headaches, vomiting, diarrhoea, heartburn, constipation, loss of appetite, abdominal cramps, and a metallic taste in the mouth. Metronidazole is a commonly used medicine and most people have no problems taking it for a week course.

  • Which is better: Metronidazole gel or tablets?

    Metronidazole cream or gel (known as Zidoval) is an effective treatment for BV that is applied inside the vagina at bedtime for a five-day period. The alternative is, of course, to take Metronidazole is tablet form. Both have similar results, though it’s thought that the vaginal treatment may exhibit fewer side effects but can be less desirable to use than tablets. 

  • What is the right dose of Metronidazole to treat BV?

    The Independent Pharmacy sells Metronidazole 400mg tablets, which are taken twice daily, bringing the dosage to 800mg daily in divided doses. This should be taken as a seven day course, which should always be completed even if your symptoms improve.

  • Why is Metronidazole contraindicated in alcoholic patients?

    When taken together with alcohol, Metronidazole tablets can produce a severe and unpleasant reaction, such as vomiting, increased heartbeat, skin redness, nausea and tingling. Therefore, it is not recommended for individuals with alcohol problems. This is the reason why you need to abstain from alcohol for the duration of your treatment and for 24 hours after your last tablet.

  • Where to buy Metronidazole over the counter

    As an antibiotic, Metronidazole tablets are available by prescription only. This can be supplied by your doctor, or through The Independent Pharmacy following an online consultation.

Authored By:

A photo of  Andy Boysan

Andy Boysan


Published on: 02-02-2017

Last modified on: 06-12-2019

Andy is a co-founder, the superintendent pharmacist and director at The Independent Pharmacy.

Reviewed By:

A photo of  Chris Newbury

Chris Newbury

BPharm IP

Reviewed on: 06-12-2019

Next review date: 06-12-2021

Chris is a vastly experienced clinical pharmacist and has been registered as an Independent Prescriber since 2014.

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