Metronidazole Tablets


Metronidazole is an antibiotic medication with a variety of uses. It is employed by doctors to help the body tackle bacterial and protozoal infections, such as Trichomoniasis.


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PLEASE NOTE: This treatment is not available through our online pharmacy service. This page is for information only. If you are experiencing any of the symptoms related to the condition(s) this medication treats, we strongly recommend that you see your GP in person.

Metronidazole is an antibiotic medicine. It belongs to a category of treatments which target anaerobic bacteria and protozoa, and is indicated for a number of different infections. Among these is trichomoniasis. The medication is supplied in standard tablet form. It is a generic version of the treatment which is also available here as Flagyl (marketed by Zentiva).

  1. Wide range of applications
  2. Effective at fighting off infection
  3. Available as an oral suspension

Trichomoniasis is a type of STI (sexually transmitted infections). It is caused by a parasite called trichomonas vaginalis, which can be passed from one individual to another through unprotected vaginal or oral sex, or through the use of sex toys. Symptoms of the illness are different depending on the gender of the person infected. In women, these might include an inflamed or sore vagina, urinary pain, yellow-green vaginal discharge or lower abdominal pain. For men, the condition might be characterised by pain during urination, inflammation of the tip of the penis, and white discharge. However, half of men and women with the condition may have no symptoms at all.

Metronidazole works by stopping the bacteria or protozoa which causes the infection from spreading. It does this by inhibiting the synthesis of certain acids, which the cells of the offending bacteria or parasite need to increase their presence in the body. When these cells are prevented from achieving further growth, they become susceptible to attack from the immune system, which then fights the infection off.

You cannot purchase Metronidazole from our online service. If you want to find out if you require this treatment, make an appointment with your doctor.

Active Ingredient

The main functioning component of this medication is Metronidazole. This treats bacterial infections and those caused by certain protozoa by inhibiting their growth. To increase in number, these bacteria require the presence of nucleic acid. This enables them to function and reproduce.

Once the production of this acid has been obstructed, the cells of the offending bacteria can no longer develop and come to a standstill. This leaves them open to attack from the body’s natural defences, which destroys the infection and clears symptoms.

Page last reviewed:  20/07/2017


To get the most out of Metronidazole and reduce the likelihood of side effects, ensure you follow the directions your prescriber provides. It is always advisable to read the patient information leaflet and familiarise yourself with the safety instructions prior to first use.

  1. Take the medicine as prescribed.
  2. For Metronidazole tablets, this might be one initial dose of 800mg (two 400mg or four 200mg tablets) followed by a dose of 400mg (one 400mg or two 200mg tablets) at 8-hour intervals for a specified period.
  3. Swallow tablets whole with water.
  4. The recommended doses for children may be different.
  5. Do not take more than your doctor tells you to.
  6. Never make up for a missed dose with a double dose. If you forget to take your medicine, continue the prescribed course as planned.

The directions supplied here are only intended as a guide. More detailed information can be found the leaflet provided.

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Page last reviewed:  20/07/2017
Please read the patient information leaflet for this medicine fully before use:

Side effects & Warnings

Side effects

Not everyone using this product will experience side effects. Nonetheless, it is important to be aware of what these are, so that you can take the necessary action should you begin to experience them.

Metronidazole tablets

Frequency unknown:
Jaundice, allergic reaction, brain disease, loss of coordination, confusion, infections, mouth ulcers, bruising, bleeding gums, tiredness, pancreatitis, convulsions, hallucinations, sight problems, skin rash, headache, cloudy urine, numbness, tingling, pain, weakness, feeling or being sick, upset stomach, or diarrhoea.

Notify your doctor immediately if you experience any of the above side effects while using this medicine.


Taking it with other medicines

Tell your doctor during consultation if you are currently using other medication, as these may affect your suitability for the treatment. Metronidazole may interact with the following: anticoagulants; epilepsy treatments such as phenytoin, primidone or phenobarbitone; 5 fluorouracil; busulfan; ciclosporin; and lithium.

Conditions to look out for

Persons with a history of certain conditions, such as liver or kidney problems, or a disease affecting the nervous system, may not be able to take this product. Inform your doctor of any medical conditions you may have or have had in the past before using this medicine.

Pregnancy and breastfeeding

It is important that this medication is not used at all in the first three months of pregnancy. It also should not be taken during the rest of pregnancy. If you are breastfeeding you should stop whilst taking a course of Metronidazole and for at least 12-24 hours after you finish your medication. Your doctor or pharmacist can provide advice about pregnancy or breastfeeding and this treatment.

Driving and machinery

This treatment may cause you to feel drowsy, confused, dizzy or alter your vision, cause fits or hallucinations. If you notice any of these symptoms you should not drive or operate machines. Do not put yourself or others at any undue risk.

Lactose intolerance

Metronidazole contains lactose sugars. If you have been made aware of an intolerance to some sugars, you should speak to your doctor before commencing a course of treatment.

Further testing

If you take this medication for longer than ten days, your doctor may wish to investigate further by carrying out more tests.

Page last reviewed:  20/07/2017
Please read the patient information leaflet for this medicine fully before use:


Can I still drink alcohol?

No. Alcohol may limit the efficacy of this treatment, and make you more susceptible to side effects. You should refrain from drinking alcohol during its use and for at least 48 hours after finishing the course.

Will I still be able to drive?

If you experience no side effects, your capacity to drive should not be affected. However, if you experience any adverse effects which impair your judgment or motor functions, then you should not drive and contact your doctor immediately.

Can I take this medicine while pregnant?

Metronidazole should be avoided by those who are pregnant or breastfeeding.

How do I store it?

In a safe place out of the reach of children, at room temperature.

Am I allergic to anything in the medicine?

Metronidazole tablets contain metronidazole, povidone, magnesium stearate, colloidal anhydrous silica and maize starch.

Do not use this treatment if you are allergic or unable to tolerate anything contained in it.

Is it available over-the-counter?

No. You will need a prescription before you can buy Metronidazole from your chemist.

Is it right for me?

To find out, you should speak to your GP. They will be able to make a thorough assessment and decide whether Metronidazole treatment is appropriate.


Page last reviewed:  20/07/2017
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