Skip to Content


Active substance(s): METRONIDAZOLE

PDF options:  View Fullscreen   Download PDF

PDF Transcript

Patient Information Leaflet



500mg and 1g Suppositories (metronidazole)
Read all of this leaflet carefully before you start using 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 for you. Do not pass it on to others.
It may harm them, even if their symptoms are the same as yours.
• If any of the side effects get serious, or if you notice any side effects
not listed in this leaflet, please tell your doctor or pharmacist.
In this leaflet:
1. What Flagyl is and what it is used for
2. Before you use Flagyl
3. How to use Flagyl
4. Possible side effects
5. How to store Flagyl
6. Further information
The name of this medicine is Flagyl 500mg or 1g Suppositories (called
Flagyl in this leaflet). Flagyl contains a medicine called metronidazole.
This belongs to a group of medicines called antibiotics.
It works by killing the bacteria that cause infections in your body.
It can be used to:
• Treat infections of the blood, brain, lung, bones, genital tract, pelvic
area and stomach
• Prevent infections after surgery
If you need any further information on your illness, speak to your doctor.

• Medicines used to thin the blood such as warfarin
• Lithium for mental illness
• Phenobarbital or phenytoin for epilepsy
• 5 fluorouracil for cancer
• Busulfan for leukaemia (cancer of the blood cells)
• Ciclosporin - to prevent rejection of organs after a transplant
• Disulfiram for alcoholism
If you are not sure, talk to your doctor or pharmacist before using Flagyl.
Taking Flagyl with food and drink
Do not drink any alcohol while you are using Flagyl and for 48 hours
after finishing your course. Drinking alcohol while using Flagyl might
cause unpleasant side effects, such as feeling sick (nausea), being sick
(vomiting), stomach pain, hot flushes, very fast or uneven heartbeat
(palpitations) and headache.
Pregnancy and breast-feeding
Talk to your doctor before using Flagyl if:
• You are pregnant, might become pregnant or think you may be
• You are breast-feeding. It is better not to use Flagyl if you are breastfeeding. This is because small amounts may pass into the mother’s milk.
Driving and using machines
You may feel sleepy, dizzy, confused, see or hear things that are not
there (hallucinations), have fits (convulsions) or temporary eyesight
problems (such as blurred or double vision). If this happens, do not
drive or use any machines or tools.
Your doctor may wish to carry out some tests if you have been using
this medicines for more than 10 days.

How to remove your suppositories from the pack

Do not use Flagyl if:
• You are allergic (hypersensitive) to metronidazole, nitroimidazoles (e.g.
tinidazole) or any of the other ingredients of Flagyl Suppositories (see
section 6: Further information) Signs of an allergic reaction include: a
rash, swallowing or breathing problems, swelling of your lips, face,
throat or tongue.
Do not use Flagyl if any of the above apply to you. If you are not sure,
talk to your doctor or pharmacist before using Flagyl.
Take special care with Flagyl and check with your doctor or
pharmacist before using your medicine if:
• You have or have ever had a liver problem
• You are having kidney dialysis (see section 3: ‘People having kidney
• You have a disease of the nervous system
If you are not sure if any of the above apply to you, talk to your doctor
or pharmacist before using Flagyl. Do this even if they have applied in
the past.
Cases of severe liver toxicity/acute liver failure, including cases with a
fatal outcome, in patients with Cockayne syndrome have been reported
with Flagyl.
If you are affected by Cockayne syndrome, your doctor should also
monitor your liver function frequently while you are being treated with
Flagyl and afterwards.
Tell your doctor immediately and stop taking Flagyl if you develop:
• Stomach pain, anorexia, nausea, vomiting, fever, malaise, fatigue,
jaundice, dark urine, putty or mastic coloured stools or itching.
Taking other medicines
Please tell your doctor or pharmacist if you are taking or have recently
taken any other medicines. This includes medicines you buy without a
prescription, including herbal medicines. This is because Flagyl can
affect the way some other medicines work. Also some medicines can
affect the way Flagyl works.
In particular, tell your doctor if you are taking any of the following

Using your medicine
Always use Flagyl exactly as your doctor has told you.
It is important to finish a full course of treatment. The length of a course
will depend on your needs and the illness being treated.
Check with your doctor or pharmacist if you are not sure.
• Remember to wash your hands before and after you insert the
• Flagyl suppositories are used by putting them into your back passage
• The dose of Flagyl will depend on your needs and the illness being
• The length of your treatment will depend on the type of infection you
have and how bad it is
The usual dose:
• Suppositories are normally used for 3 days
• As soon as possible after starting treatment with the suppositories,
your doctor will suggest changing to a medicine taken by mouth
• However, after 3 days, if your doctor wants you or your child to carry
on using the suppositories, you will probably be told to use the
suppositories every 12 hours.
The usual doses for adults and children using suppositories are provided
To treat infections
Adults and children over 10 years
• Use one 1g suppository, every 8 hours for 3 days. See above for
dosing after 3 days



1. Tear off a
section containing
one suppository


2. Pull apart
the plastic flaps

3. Use the flaps
to peel the plastic
away from the

Children aged 5 - 10 years
• Use one 500mg suppository, every 8 hours for 3 days. See above
for dosing after 3 days
Children aged 1 - 5 years
• Use one half of a 500mg suppository, every 8 hours for 3 days. See
above for dosing after 3 days
Infants under 1 year old
• Use one quarter of a 500mg suppository, every 8 hours for 3 days.
See above for dosing after 3 days
To prevent infections from happening after surgery
Adults and children over 10 years
• Use one 1g suppository 2 hours before surgery
• Repeat every 8 hours for up to 3 days. See above for dosing after
3 days
Children aged 5 - 10 years
• Use one 500mg suppository 2 hours before surgery
• Repeat every 8 hours for up to 3 days. See above for dosing after
3 days
People having kidney dialysis
Your doctor may tell you to stop using Flagyl during your dialysis and
start using it again when your dialysis is finished.
People with liver problems
Your doctor may tell you to use a lower dose or to use the medicine less
If you use more Flagyl than you should
If you have used more suppositories than you should or if you or a child
swallow any suppositories, tell a doctor or go to a hospital casualty
department straight away. Take the pack and any suppositories left with
you. This is so that the doctors know what you have taken.
If you forget to use Flagyl
If you forget to use a Flagyl suppository, use it as soon as you remember.
However if it is nearly time for the next dose, skip the missed dose. Do
not use a double dose to make up for a forgotten dose.
Like all medicines, Flagyl can cause side effects, although not everybody
gets them.
Stop using Flagyl and see a doctor or go to a hospital straight away if:
• You get swelling of the hands, feet, ankles, face, lips or throat which
may cause difficulty in swallowing or breathing. You could also notice
an itchy, lumpy rash (hives) or nettle rash (urticaria). This may mean
you are having an allergic reaction to Flagyl
• A serious but very rare side effect is a brain disease (encephalopathy).
Symptoms vary but you might get a fever, stiff neck, headache, see or
hear things that aren’t there. You might also have problems using your
arms and legs, problems with speaking or feel confused.
• You develop skin rashes with blistering, peeling or bleeding of the skin
around the lips, eyes, mouth, nose, and genitals. You may also have flulike symptoms and a high temperature. These could be signs of something
called ‘Stevens-Johnson Syndrome or toxic epidermal necrolysis’.
Talk to your doctor straight away if you notice the following side
• Yellowing of the skin and eyes. This could be due to a liver problem
• Unexpected infections, mouth ulcers, bruising, bleeding gums, or
severe tiredness. This could be caused by a blood problem
• Severe stomach pain which may reach through to your back
Tell your doctor or pharmacist if you notice any of the following side
Very rare (affects less than 1 in 10 000 people)
• Fits (convulsions)
• Mental problems such as feeling confused and seeing or hearing things
that are not there (hallucinations)


• Problems with your eyesight such as blurred or double vision
• Skin rash or flushing
• Headache
• Darkening of the urine
• Feeling sleepy or dizzy
• Pains in the muscles or joints
• Liver problems including life-threatening liver failure (hepatocellular
liver injury)
Not known (frequency cannot be estimated from the available data)
• 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 pain or
• 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)
• Hearing impairment/ hearing loss
• Ringing in the ears (tinnitus)
• You get a rash or skin discolouration with or without raised areas which
often reoccurs at the same location each time the drug is taken.
Reporting of side effects
If you get any side effects, talk to your doctor, pharmacist or nurse. This
includes any possible side effects not listed in this leaflet. You can also
report side effects directly via the Yellow Card Scheme at:
By reporting side effects you can help provide more information on the
safety of this medicine.
• Keep your suppositories in a safe place out of the reach and sight of
• Store them below 20°C.
• Store in the original package in order to protect them from light.
• Do not use this medicine after the expiry date shown on the pack.
• Ask your pharmacist how to dispose of medicines no longer required.
Do not dispose of medicines by flushing down a toilet or sink or by
throwing out with your normal household rubbish. This will help to
protect the environment.
What Flagyl Suppositories contain
Each suppository contains 500mg or 1g of metronidazole as the active
Other ingredients are: suppository bases E75 and W35, which are
vegetable fats.
What Flagyl Suppositories look like and contents of the pack
Flagyl 500mg and 1g Suppositories are cream coloured, smooth
surfaced and torpedo shaped.
They are available in blister packs of 10 suppositories
The Marketing Authorisation Holder is: Zentiva, One Onslow Street,
Guildford, Surrey, GU1 4YS, UK
The Manufacturer is: Haupt Pharma, Livron, France
This leaflet does not contain all the information about your medicine. If
you have any questions or you are not sure about anything ask your
doctor or pharmacist.
This leaflet was revised in November 2016.
‘‘Flagyl’’ and ‘‘Zentiva’’ are registered trademarks. ©2016 Zentiva.



+ Expand Transcript

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.