Metronidazole (Flagyl)

Buy metronidazole tablets (generic Flagyl) to treat bacterial vaginosis

Metronidazole is a powerful prescription antibiotic that treats BV in women, as well as a range of other bacterial and parasitic infections.

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Strength Quantity Price Stock
400mg10 tablets£13.99In Stock
Prices exclude a prescription fee. This treatment requires a quick online consultation,
which a doctor will review to determine if a prescription is appropriate.

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What is Metronidazole?

Metronidazole is an antibiotic used to treat a wide variety of bacterial and parasitic infections. It is used to treat infection of the skin and mouth, the respiratory system, the gastrointestinal tract and much of the reproductive system. Metronidazole is commonly prescribed to treat bacterial vaginosis (BV) in women.

How does Metronidazole work?

Metronidazole works by preventing bacteria from reproducing an spreading, giving your body’s immune system the chance to get rid of infection. For treatment of BV, this allows the natural balance of bacteria in the vagina to be restored.

How long does Metronidazole take to work?

Metronidazole should begin to make you feel better within a few days. However, you must finish the full course of tablets even if you are feeling better.


Active ingredients

The active ingredient of Metronidazole is metronidazole.

Inactive ingredients

The inactive ingredients are povidone, magnesium stearate, colloidal anhydrous silica and maize starch.

Please Note: Different brands of generic Metronidazole may contain different ingredients than those listed here.


How to take Metronidazole

Always take Metronidazole as instructed by a doctor or pharmacist. For treatment of bacterial infection in adults the usual dose is 2 x 400 mg tablets initially, then 1 x 400 mg tablet every 8 hours after. Your doctor will tell you how long to keep taking your tablets. 

Swallow the tablets whole with a glass of water, preferably during or just after a meal to avoid side effects such as nausea or vomiting. Do not crush or chew the tablets. If you forget to take a dose, try and take it as soon as you remember. However, if it is nearly time for your next dose, just skip the forgotten dose and take the next one as planned. Never take a double dose to make up for a missed one. 

Can Metronidazole tablets be crushed or split?

Metronidazole tablets should not be crushed or split.

Side Effects

Metronidazole side effects

Like all medications, Metronidazole can cause side effects in some patients. If you experience any of the following rare side effects, stop taking Metronidazole and seek medical attention immediately:

  • Swelling of the hands, feet, ankles, face, lips or throat, difficulty breathing, itchy rash or hives, all of which could be symptoms of a severe allergic reaction
  • Encephalopathy (brain disease), with symptoms such as fever, stiff neck, headache, hallucinations, problems using your arms and legs, problems with speaking or feeling confused
  • Skin rashes with blistering, peeling or bleeding around the lips, eyes, mouth, nose or genitals, flu-like symptoms or a high temperature, all of which could be symptoms of Steven-Johnson Syndrome or toxic epidermal necrolysis.

Speak to your doctor if you experience any of the following side effects:

  • Jaundice (yellowing of the skin or whites of the eyes)
  • Unexpected infections, mouth ulcers, bruising, bleeding gums or severe tiredness, which could indicate blood problems
  • Severe stomach pain which may reach through to your back (pancreatitis)

The following side effects affect less than 1 in 10 000 people, but should be reported immediately to a doctor or pharmacist:

  • Fits (convulsions)
  • Mental confusion or hallucinations
  • Blurred or double vision
  • Skin rash and flushing
  • Headache
  • Darkening of the urine
  • Feeling sleepy or dizzy
  • Muscle or joint pain
  • Hepatocellular liver injury

The frequency of the following side effects cannot be estimated from the available data:

  • Numbness, tingling, pain or weakness in the arms of legs
  • Unpleasant taste in the mouth
  • Furred tongue
  • Nausea, vomiting, or diarrhoea
  • Loss of appetite
  • Fever
  • Depression
  • Optic neuritis (pain in the eyes)
  • Fever accompanied by nausea, vomiting, headache, stiff neck and sensitivity to light, which could be caused by meningitis
  • Hearing impairment or loss
  • Tinnitus
  • Skin rash with or without raised areas recurrent in the same skin area each time the drug is taken


Do NOT take metronidazole tablets if you are allergic to any of the ingredients in this medication, or to nitroimidazoles.

Take particular caution and tell your doctor or pharmacist if:

  • You have or have ever had liver problems
  • You are having kidney dialysis
  • You have a disease of the nervous system
  • You are affected by Cockayne syndrome

Drug interactions

Before taking Metronidazole, tell your doctor or pharmacist if you are taking any other medications, including those purchased over the counter without a prescription. In particular, tell your doctor or pharmacist if you are taking any of the following:

  • Anticoagulants such as warfarin
  • Lithium for mental illness
  • Medicines used to treat epilepsy, such as phenytoin, primidone and phenobarbitone
  • 5 fluorouracil for cancer
  • Busulfan for leukaemia
  • Ciclosporin
  • Disulfiram for alcoholism

Metronidazole and pregnancy

Metronidazole should not be taken during pregnancy or breastfeeding unless absolutely necessary. You should inform your doctor if you are pregnant, think you might be pregnant or plan to become pregnant before taking this medication.

Metronidazole and alcohol

Do not drink alcohol while taking Metronidazole or for the 48 hours after finishing your course. Combining alcohol with this medication can cause side effect such as nausea, vomiting, stomach pain, hot flushes, heart palpitations and headaches.

Treatment Options

Metronidazole Tablets vs Gel

For treatment of infections such as BV, there is little difference in effectiveness between Metronidazole tablets and gel. The only clear difference is that the gel is significantly more expensive than the tablets. The topical gel carries a slightly higher chance of causing vaginal thrush as a side effect, while the tablets are more likely to induce gastrointestinal side effects such as nausea or vomiting, although these can be avoided by taking each dose with food. Each patient reacts differently to different forms of antibiotic, so if you are worried about any side effects, speak to your doctor for advice. 


When can I stop taking Metronidazole?

Metronidazole is an antibiotic, so the it is vital that you complete the full course of treatment prescribed to you by your doctor. The length of course will depend on they type of infection, and even if your symptoms have gone, you must continue until the end of the course.

Does Metronidazole affect birth control?

Metronidazole does not affect any type of oral contraception or prevent it from working. However, if you experience vomiting or severe diarrhoea as a side effect of Metronidazole, your contraceptive pill may not prevent pregnancy. See the packet instructions of your contraception for advice if this happens.

Is Metronidazole an antibiotic?

Metronidazole is an antibiotic that is used to treat a wide variety of bacterial and parasitic infections.

Does Metronidazole cause thrush?

Metronidazole can cause thrush in some patients if the antibiotics attack the normal, harmless bacteria which live in the vagina. This is more common in patients who use Metronidazole gel rather than tablets. 

Can Metronidazole affect fertility?

Metronidazole does not affect fertility in men or women, but you should seek advice from your doctor if you are trying to get pregnant while using this medication.

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I moved 150 miles from my GP (to uni) and was unable to go home or visit a walk in for another 2 days due to being at work (12.5 hour shifts). I filled out a quick form - and 1.5 days later I had my antibiotics delivered to my door and I am on the mend. 10/10.