Consumer Medicine Information
What is in this leaflet
This leaflet answers some common questions about clarithromycin. It does not contain
all the available information. It does not take the place of talking to your doctor
All medicines have risks and benefits. Your doctor has weighed the risks of you using
this medicine against the benefits they expect it will have for you.
If you have any concerns about taking this medicine, ask your doctor or pharmacist.
Keep this leaflet with the medicine.
You may want to read it again.
What this medicine is used for
Clarithromycin belongs to a group of medicines called macrolide antibiotics.
Clarithromycin is used to treat certain bacterial infections, such as:
respiratory tract infections
Clarithromycin is also used to prevent a specific bacterial infection associated with
How it works
Clarithromycin works by killing or stopping the growth of bacteria which causes infections.
This medicine will not work against infection caused by viruses, such as cold or flu.
Ask your doctor if you have any questions about why this medicine has been prescribed
Your doctor may have prescribed it for another reason.
This medicine is available only with a doctor's prescription.
This medicine is not addictive.
These tablets are not recommended for children under 12 years of age.
Before you take this medicine
When you must not take it
Do not take this medicine if you have an allergy to:
other macrolide antibiotics (e.g. erythromycin, roxithromycin, azithromycin)
any of the ingredients listed at the end of this leaflet.
Symptoms of an allergic reaction may include:
shortness of breath
wheezing or difficulty breathing
swelling of the face, lips, tongue, throat or other parts of the body
rash, itching or hives on the skin
Do not take this medicine if you have or have had any of the following medical conditions:
irregular heartbeat, including Torsades de pointes
severe liver and kidney problems
liver or kidney problems, and taking a p-glycoprotein inhibitor or a strong CYP3A4
hypokalaemia (low potassium).
Do not take this medicine if you are taking any of the following medicines:
astemizole or terfenadine, used to treat allergy symptoms
cisapride, used to treat stomach problems
pimozide, used to treat psychotic disorders
ergotamine or dihydroergotamine, used to treat migraines
lovastatin or simvastatin, used to treat high cholesterol
ticagrelor or ranolazine
Do not take this medicine after the expiry date printed on the pack or if the packaging
is torn or shows signs of tampering.
If it has expired or is damaged, return it to your pharmacist for disposal.
If you are not sure whether you should start taking this medicine, talk to your doctor.
Before you start to take it
Tell your doctor if you have allergies to any other medicines, foods, preservatives
Tell your doctor if you have or have had any of the following medical conditions:
liver, kidney or heart problems
low potassium or magnesium
skin and soft tissue infections.
Tell your doctor if you are pregnant, plan to become pregnant or are breastfeeding.
Do not take this medicine until you and your doctor have discussed the risks and benefits
Taking other medicines
Tell your doctor if you are taking any other medicines, including any that you get
without a prescription from your pharmacy, supermarket or health food shop.
Some medicines may interact with clarithromycin. These include:
medicines used to prevent blood clotting (e.g. warfarin, cilostazol)
some medicines used for epilepsy (e.g. phenytoin, valproate, carbamazepine, hexobarbital)
theophylline, used to treat asthma
some medicines used to treat heart complaints (e.g. digoxin, quinidine, disopyramide,
verapamil, amlodipine, diltiazem)
medicines used to treat sleeplessness such as triazolam
alprazolam, used to treat anxiety
anti-viral medicines (e.g. zidovudine, ritonavir, indinavir, atazanavir, saquinavir,
efavirenz, nevirapine, etravirine)
some antibiotics (e.g. rifampicin, rifabutin, aminoglycosides)
itraconazole and ketoconazole, used to treat fungal infections
fluoxetine, used for treating depression
colchicine, used to treat gout
some medicines used to treat erection problems (e.g. sildenafil, tadalafil, vardenafil)
vinblastine, used to treat certain cancers
some medicines used to suppress the immune system (e.g. cyclosporin, tacrolimus, methylprednisolone)
atorvastatin and rosuvastatin, used for lowering cholesterol
omeprazole, used in treating stomach ulcers
tolterodine, used to treat urinary incontinence
medicines used to treat diabetes, (e.g. insulin, repaglinide, nateglinide, pioglitazone,
herbal medicines (e.g. St John's Wort)
If you are taking any of these, you may need a different dose, or you may need to
take different medicines.
Other medicines not listed above may also interact with clarithromycin.
How to take this medicine
Follow all directions given to you by your doctor and pharmacist carefully.
They may differ to the information contained in this leaflet.
If you do not understand the instructions on the pack, ask your doctor or pharmacist
How much to take
Your doctor will tell you how much of this medicine you should take, depending on
your condition and if you are taking any other medicines.
For respiratory tract infections and skin infections, the usual adult dose is one
clarithromycin 250 mg tablet twice a day.
For more severe infections, the dose may be increased.
For respiratory tract infections, the usual dose for children is 7.5mg/kg twice a
Your doctor may adjust the amount or frequency of the dose according to the infection
being treated and the severity of your condition.
How to take it
Swallow the tablet whole with a full glass of water.
When to take it
Take your medicine at about the same time each day.
Taking your medicine at the same time each day will have the best effect. It will
also help you remember when to take it.
It does not matter if you take it with or without food.
How long to take it for
Continue taking your medicine for as long as your doctor tells you.
If you are being treated for an infection, clarithromycin is usually taken for one
or two weeks.
Do not stop taking clarithromycin, even if you feel better after a few days, unless
advised by your doctor. Your infection may not clear completely if you stop taking
your medicine too soon.
Make sure you have enough to last over weekends and holidays.
If you forget to take it
If it is almost time for your next dose, skip the dose you missed and take your next
dose when you are meant to.
Otherwise, take it as soon as you remember, and then go back to taking your medicine
as you would normally.
Do not take a double dose to make up for the dose that you missed.
This may increase the chance of you experiencing side effects.
If you are not sure what to do, ask your doctor or pharmacist.
If you have trouble remembering to take your medicine, ask your pharmacist for some
If you take too much (overdose)
Immediately telephone your doctor or the Poisons Information Centre (telephone 13
11 26) for advice or go to the Emergency department at your nearest hospital if you
think that you or anyone else may have taken too much of this medicine. Do this even
if there are no signs of discomfort or poisoning. You may need urgent medical attention.
If you take too much clarithromycin, you may develop severe stomach problems, liver
problems or experience an allergic reaction.
While you are taking this medicine
Things you must do
If you are about to be started on any new medicine, tell your doctor and pharmacist
that you are taking this medicine.
Tell any other doctors, dentists and pharmacists who are treating you that you take
If you become pregnant while taking this medicine, tell your doctor immediately.
If you are taking this medicine for an infection and your symptoms do not improve
within a few days, or if they become worse, tell your doctor.
Tell your doctor immediately if you get severe diarrhoea. Do this even if it occurs
several weeks after stopping clarithromycin.
Diarrhoea may mean that you have a serious condition affecting your bowel. You may
need urgent medical care. Do not take any medicine to stop your diarrhoea without
first checking with your doctor.
If you get a sore white mouth or tongue while taking or soon after stopping clarithromycin,
tell your doctor. Also tell your doctor if you get vaginal itching or discharge.
This may mean you have a fungal infection called thrush. Sometimes the use of this
medicine allows fungi to grow and the above symptoms to occur.
Keep all of your doctor's appointments so that your progress can be checked.
Your doctor may occasionally do tests to make sure the medicine is working and to
prevent side effects.
Things you must not do
Do not give this medicine to anyone else, even if they have the same condition as
Do not take your medicine to treat any other complaint unless your doctor tells you
Do not stop taking your medicine, or change the dosage, without first checking with
Your infection may not clear completely if you stop taking your medicine too soon.
Things to be careful of
Be careful driving or operating machinery until you know how clarithromycin affects
Tell your doctor as soon as possible if you do not feel well while you are taking
All medicines can have side effects. Sometimes they are serious, most of the time
they are not. You may need medical attention if you get some of the side effects.
Do not be alarmed by the following lists of side effects. You may not experience any
Ask your doctor or pharmacist to answer any questions you may have.
Tell your doctor or pharmacist if you notice any of the following:
stomach cramps and pains
nausea, vomiting and severe diarrhoea
oral thrush or vaginal thrush
change in taste sensation
Tell your doctor as soon as possible if you notice any of the following:
yellowing of the eyes or skin (jaundice)
feeling generally unwell and having poor appetite
dizziness, confusion, hallucinations, convulsions
any type of skin rash, itching, hives
severe diarrhoea, especially if bloody
severe upper stomach pain with nausea and vomiting (pancreatitis)
unexpected muscle pain, tenderness or weakness not caused by exercise.
These may be serious side effects and you may need medical attention.
Tell your doctor immediately if you notice any of the following side effects, even
if they occur several weeks after stopping treatment with clarithromycin:
severe stomach or abdominal cramps
watery and severe diarrhoea, which may also be bloody
fever, in combination with one or both of the above.
These are serious side effects. You may have a serious condition affecting your bowel
and you may need urgent medical care.
Do not take any diarrhoea medicine without first checking with your doctor.
Other side effects not listed above may occur in some patients.
Tell your doctor or pharmacist if you notice anything that is making you feel unwell.
If you think you are having an allergic reaction to clarithromycin, do not take any
more of this medicine and tell your doctor immediately or go to the Accident and Emergency
department at your nearest hospital.
Symptoms of an allergic reaction may include some or all of the following:
shortness of breath, wheezing or difficulty breathing
swelling of the face, lips, tongue, throat or other parts of the body
rash, itching or hives on the skin
Storage and disposal
Keep your medicine in its pack until it is time to take it.
If you take the tablets out of their pack, they may not keep well.
Keep your medicine in a cool dry place where the temperature stays below 30°C.
Do not store your medicine, or any other medicine, in the bathroom or near a sink.
Do not leave it on a window sill or in the car.
Heat and dampness can destroy some medicines.
Keep it where children cannot reach it.
A locked cupboard at least one-and-a-half metres above the ground is a good place
to store medicines.
If your doctor tells you to stop taking this medicine or the expiry date has passed,
ask your pharmacist what to do with any medicine left over.
What it looks like
250 mg tablets:
Pale yellow, oval, film-coated tablets engraved "CLA250" on one side, "APO" on the
Available in blister packs of 2, 14, 28 and 100 tablets. AUST R 134850
Available in bottles of 14, 28 and 100 tablets. AUST R 134865
500 mg tablets:
Pale yellow, capsule-shaped, film-coated tablets engraved "CLA500" on one side, "APO"
on the other side.
Available in blister packs of 3, 14, 20, 28, 42 and 100 tablets. AUST R 134856
Available in bottles of 14, 20, 28, 42 and 100 tablets. AUST R 134883
* Not all strengths, pack sizes and/or pack types may be available.
Each tablet contains 250 mg or 500 mg of clarithromycin as the active ingredient.
It also contains the following:
colloidal anhydrous silica
iron oxide yellow E172
titanium dioxide E171
This medicine does not contain gluten, lactose, sucrose, tartrazine or any other azo
Apotex Pty Ltd
16 Giffnock Avenue
Macquarie Park NSW 2113
APO and APOTEX are registered trademarks of Apotex Inc.
This leaflet was prepared in March 2019.