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Active substance(s): METRONIDAZOLE

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Patient Information Leaflet
Read all of this leaflet carefully before you start taking this medicine.
• Keep this leaflet. You may need to read it again
• If you have any further questions, ask your doctor or your pharmacist
• This medicine has been prescribed only for you. Do not pass it on to others. It may harm them, even if
their symptoms are the same as yours
• If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not
listed in this leaflet. See section 4.
1. What your medicine is and what it is used for.
2. What you need to know before you take your medicine.
3. How to take your medicine.
4. Possible side effects.
5. How to store your medicine.
6. Contents of the pack and other information.

The name of this medicine is Metronidazole 200mg tablets (called Metronidazole tablets in this leaflet).
Metronidazole belongs to a group of medicines called antibiotics.
It works by killing bacteria and parasites that cause infections in your body. It can be used to:

Treat infections of the blood, brain, lung, bones, genital tract, pelvic area, stomach and intestines.
Treat gum ulcers and other dental infections.
Treat infected leg ulcers and pressure sores.
Prevent infections after surgery.

Do not take Metronidazole tablets and tell your doctor if
You are allergic (hypersensitive) to metronidazole, nitroimidazoles (e.g. tinidazole) or any of the other
ingredients (see section 6). Signs of an allergic reaction include a rash, itching, difficulty breathing or
swallowing, swelling of the face, tongue or throat.
Warnings and precautions
Talk to your doctor or pharmacist before taking Metronidazole if
• You suffer or have ever suffered from liver problems
• You have kidney problems and are having dialysis (see section 3: ‘People having kidney dialysis’).
• You suffer from a condition called porphyria (a blood disorder leading to abnormal sensitivity to sunlight
and other problems)
• You have a disease of the nervous system
• You have intolerance to some sugars as this medicine contains lactose
• You have been prescribed this medicine for more than 10 days – your doctor may wish to carry out
some tests and monitor you closely for development of side effects to your nervous system
If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking this
medicine. Do this even if they have applied to you in the past.
Other medicines and metronidazole
Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines,
including medicines obtained without a prescription such as herbal medicines, especially:

Medicines to stop your blood clotting (e.g. coumarins, warfarin).
Medicines used to treat epilepsy (e.g. phenobarbital, phenytoin, primidone).
Lithium (used to treat depression).
Medicines used to treat cancer (e.g. busulfan, fluorouracil or mycophenolate).
Disulfiram (used to treat alcohol addiction).
Medicines used to treat stomach ulcers (e.g. cimetidine).
Oestrogen contraceptives (known as ‘the pill’).
Ciclosporin (used to prevent the rejection of organs after transplant).

Metronidazole tablets with food and drink
Do not drink any alcohol while you are taking Metronidazole tablets and for 48 hours after finishing your
course. Drinking alcohol while using Metronidazole tablets might cause unpleasant side effects such as
nausea (feeling sick), vomiting (being sick), stomach pain, hot flushes, very fast or uneven heartbeat
(palpitations) and headache.
Pregnancy and breast-feeding
Speak to your doctor or pharmacist before taking this medicine if:
• you are pregnant, think you may be pregnant or are planning to become pregnant. Metronidazole
tablets should not be taken during pregnancy unless considered absolutely necessary.
• You are breast-feeding. It is better not to take this medicine if you are breast-feeding because small
amounts of it may pass into the mother’s milk.
Always ask your doctor or pharmacist for advice before taking any medicine.
Driving and using machines
This medicine may make you feel drowsy, dizzy, confused or affect your vision, cause fits or
hallucinations. Make sure you are not affected before you drive or operate machinery.
Metronidazole tablets contain lactose
This medicine contains a sugar called lactose. Some people may be intolerant to this sugar. If you have
been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking
this medicinal product.

Take this medicine exactly as your doctor has told you. It is important to finish a full course of treatment.
The dose and length of your treatment with Metronidazole tablets will depend on your needs and the type
of illness being treated. Check with your doctor or pharmacist if you are not sure.
• Swallow the tablets whole with a drink of water.
• Do not crush or chew the tablets.
• Take these tablets during or just after a meal.
The usual dose for adults and children is given below:
To treat bacterial infection:
• The initial dose is 800mg (4 tablets)
• After 8 hours take another dose of 400mg (2 tablets) and repeat this dose every 8 hours
• Your doctor will work out how much your child should take depending on their weight.
• Repeat the dose every 8 hours
• If your child is a baby under 8 weeks of age, your doctor will give them one daily dose or two separate
doses 12 hourly
To prevent infections from happening after surgery:
• Start taking Metronidazole tablets 24 hours before your operation
• Take 400mg (2 tablets) of Metronidazole tablets every 8 hours
• After the operation you may be give metronidazole either through a drip into a vein or rectally as a
suppository until you are able to take tablets again

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• Start giving your child Metronidazole tablets 1-2 hours before their operation. Your doctor will work out
how much your child should take depending on their weight
• After the operation your child may be given metronidazole either through a drip into a vein or rectally as
a suppository until they are able to take tablets again
Other types of infections
For treatment of other infections caused by parasites and some bacteria your doctor will decide how
many Metronidazole tablets you need to take and how often. This will depend on your illness and how
bad it is. Always check with your doctor or pharmacist if you are not sure.
Metronidazole tablets are well tolerated by the elderly but caution should be exercised with high dosage
People having kidney dialysis
Kidney dialysis removes metronidazole from your blood. If you are having kidney dialysis you must take
this medicine after your dialysis treatment.
If you take more tablets than you should
If you take more tablets than you should, or if you think a child has accidentally swallowed some tablets,
contact the nearest hospital casualty department or speak to your doctor for advice immediately. Take
this leaflet and any tablets that you still have, to show the doctor. Signs of an overdose include feeling or
being sick, loss of appetite, diarrhoea, metallic taste, headache, dizziness, insomnia or drowsiness.
If you forget to take your tablets
Take the next dose as soon as you remember. However, if it is nearly time for the next dose, skip the
missed dose. Do not take a double dose to make up for forgotten doses.
If you stop taking the tablets
Keep taking the tablets until you have finished the course. Do not stop taking them even if you start to
feel better after a few days. If you are unsure about anything, talk to your doctor and follow their advice.
The dose your doctor or pharmacist advises may be different to the doses given in this leaflet. Always
follow your doctor or pharmacist’s instructions when taking any medicines.
If you have any further questions on the use of this product, ask your doctor or pharmacist.

Like all medicines, Metronidazole tablets can cause side effects, although not everybody gets them.
Stop taking your medicine and see a doctor or go to a hospital immediately if:
• You have an allergic reaction (signs include skin rash, flaking skin, boils, sore lips or mouth; wheezing;
fluttering or tightness of the chest or collapse; swelling of the face, tongue or throat)
• You suffer a serious but very rare brain disease (encephalopathy). Symptoms may include a fever, stiff
neck, headache, hallucinations, problems using your arms and legs, problems with speaking, feeling
• You develop skin rashes with blistering, peeling or bleeding of the skin around the lips, eyes, mouth,
nose and genitals. You may also have flu-like symptoms and a high temperature. These could be
signs of severe allergic skin reactions called Stevens-Johnson Syndrome or toxic epidermal necrolysis.
Talk to your doctor straight away if you notice any of the following side effects:
• Blood disorders (signs may include increased bruising, sore throats, unexpected infections, mouth
ulcers, bleeding gums or unusual tiredness)
• Yellowing skin and whites of the eyes
• Severe stomach pain which may reach through to your back (pancreatitis)
Tell your doctor or pharmacist if you notice any of the following side effects:
Very rare (affects less than 1 in 10 000 people)
• Fits (convulsions)
• Feelings of confusion, seeing or hearing things that are not there (hallucinations)
• Muscle weakness, muscle pain or joint pain
• Eyesight problems such as blurred or double vision
• Drowsiness, dizziness, headaches
• Skin rashes, itching, blisters, circular red patches on the skin. Darkening of urine
• Liver problems including life-threatening liver failure (hepatocellular liver injury)
• Abnormal liver function tests
Not known (frequency cannot be estimated from the available data)
• Paralysis (numbness), tingling, pain or a feeling of weakness in the arms or legs
• Unpleasant taste in the mouth. Furred tongue
• Feeling sick, being sick, upset stomach or diarrhoea
• Loss of appetite
• Fever
• Feeling depressed
• Pain in your eyes (optic neuritis)
• A group of symptoms together including fever, nausea, vomiting, headache, stiff neck and extreme
sensitivity to bright light. This may be caused by an inflammation of the membranes that cover the
brain and spinal cord (meningitis)
Reporting of side effects
If you get any side effects, talk to your doctor or pharmacist. This includes any possible side
effects not listed in this leaflet. You can also report side effects directly via Yellow Card Scheme Website: . By reporting side effects you can help provide more information on the
safety of this medicine.

Keep out of the sight and reach of children.
Do not use after the expiry date stated on the label.
Store in a dry place, below 25°C.
Keep container tightly closed, protect from light.
Do not use if you notice any damage or discolouration to the tablets.
Medicines should not be disposed of via wastewater or household waste. Ask your pharmacist how to
dispose of medicines no longer required. These measures will help to protect the environment.

What Metronidazole tablets contain
The active substance is metronidazole. Each tablet contains 200mg of metronidazole.
The other ingredients are lactose, maize starch, pregelatinised maize starch, sodium starch glycollate
and magnesium stearate.
What Metronidazole tablets look like and contents of the pack
Metronidazole tablets are flat, white or creamy-white scored tablets.
These tablets are available in pack sizes of 21, 28, 30, 50, 56, 60, 84, 90, 100, 112, 120, 140,
150, 168, 180, 250, 500, 1000, 5000 or 50000 tablets (not all pack sizes are marketed).
Marketing Authorisation Holder and Manufacturer:
Intrapharm Laboratories Limited, The Courtyard Barns, Choke Lane, Cookham Dean, Maidenhead,
For any information about this medicine, please contact the Marketing Authorisation Holder on the details
provided above.
PL 17509/0073
This leaflet was last revised in October 2016
Other formats
To request a copy of this leaflet in Braille, large print or audio, please call 01628 771800.

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Further information

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