Consumer Medicine Information
What is in this leaflet
This leaflet answers some common questions about Rythmodan. It does not contain all
the available information. It does not take the place of talking to your doctor or
All medicines have risks and benefits. Your doctor or pharmacist has weighed the
risks of you taking Rythmodan 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 need to read it again.
What Rythmodan is used for
Rythmodan belongs to a group of medications called antiarrhythmics. This means it
acts to correct irregular heartbeats to a normal rhythm and to slow an overactive
heart. This allows the heart to work more efficiently.
Rythmodan is used to treat and prevent ventricular arrhythmias (irregular heartbeat).
Ask your doctor if you have any questions about why Rythmodan has been prescribed
Your doctor may have prescribed Rythmodan for another reason. This medicine is available
only with a doctor's prescription.
Before you take Rythmodan
When you must not take it
Do not take Rythmodan if you have an allergy to Rythmodan or any of the ingredients
listed at the end of this leaflet.
Some symptoms of an allergic reaction may include skin rash, itching, shortness of
breath or swelling of the face, lips or tongue, which may cause difficulty in swallowing
Do not give Rythmodan to a child or adolescent. Rythmodan is not recommended for use
during pregnancy, unless you and your doctor or pharmacist have discussed the risks
and benefits involved.
Do not take Rythmodan if you are taking other antiarrhythmics or other heart medications
without first discussing with your doctor.
Do not take Rythmodan without first discussing all previous and pre-existing heart
problems with your doctor.
Do not take Rythmodan if you are breast-feeding or plan to breast-feed.
Rythmodan passes into breast milk and therefore there is a possibility that the breast-fed
baby may be affected.
Rythmodan is not recommended for use in children.
Do not take Rythmodan after the expiry date (EXP) printed on the pack.
If you take this medicine after the expiry date has passed, it may not work as well.
Do not take Rythmodan 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 Rythmodan, contact your doctor or pharmacist.
Before you start to take it
Tell your doctor or pharmacist if you have allergies to:
any other medicines
any other substances, such as foods, preservatives or dyes
Tell your doctor or pharmacist if you are pregnant or intend to become pregnant.
Your doctor or pharmacist will discuss the possible risks and benefits of using Rythmodan
Tell your doctor or pharmacist if you are breast-feeding or plan to breast-feed.
Rythmodan is not recommended while you are breast-feeding.
Tell your doctor or pharmacist if you have or have had any medical conditions, especially
Glaucoma or a family history of glaucoma
Chronic muscular weakness (Myasthenia Gravis)
Heart problems including heart failure, heart attack, chest pain
Low blood pressure (dizziness or light-headedness)
Low or high potassium levels in your blood
Difficult urination or
Taking other medicines
Tell your doctor or pharmacist if you are taking any other medicines, including any
that you buy without a prescription from your pharmacy, supermarket or health food
Some medicines and Rythmodan may interfere with each other. These include:
Other antiarrhythmics used to treat heart conditions such as beta-blockers, amiodarone
and calcium channel blockers
Diuretics or antiangina medication
Medicines used to treat epilepsy or fits, especially phenytoin and phenobarbitone
Tricyclic and tetracyclic antidepressants
Antibacterials to treat infections such as rifampicin, erythromycin, roxithromycin
Antifungals such as fluconazole, ketoconazole, itraconazole and amphotericin B
Antimicrobials to treat infections, such as pentamidine
Medications used to treat HIV
Antihistamines such as terfenadine and astemizole
Cisapride, a medicine used to treat stomach problems
Pimozide, a medicine used to treat certain mental illnesses
Laxatives for constipation
Medicines for erectile dysfunction such as Viagra or Levitra
Warfarin, a medicine used to prevent blood clots
These medicines may be affected by Rythmodan, or may affect how well it works. You
may need different amounts of your medicine, or you may need to take different medicines.
Your doctor or pharmacist will advise you.
Your doctor and pharmacist may have more information on medicines to be careful with
or avoid while taking Rythmodan.
How to take it
How much to take
The dose of Rythmodan may be different for each person. Your doctor will decide the
right dose for you.
How to take it
Swallow Rythmodan whole with plenty of fluid.
The daily dose of Rythmodan is usually taken in three equally divided doses.
When to take it
Take Rythmodan at about the same time each day.
Taking your capsules at the same time each day will have the best effect. It will
also help you remember when to take your medicine.
It does not matter if you take Rythmodan before or after food.
This medicine works best when there is a constant amount in the blood. To help keep
the amount constant it is best to take the doses at evenly spaced intervals day and
How long to take it
Rythmodan helps control your condition, but does not cure it. Therefore you must take
Rythmodan every day. Continue taking the capsules for as long as your doctor or pharmacist
Do not stop taking your capsules because you are feeling better.
If you forget to take it
If it is almost time for your next dose (within 4 hours), 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 try to make up for a missed dose by taking more than one dose at a time.
This may increase the chance of you getting an unwanted side effect.
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 pharmacist or the Poisons Information Centre
(telephone 13 11 26 and in New Zealand telephone 0800 764766) or go to accident and
emergency at your nearest hospital, if you think that you or anyone else may have
taken too much Rythmodan. Do this even if there are no signs of discomfort or poisoning.
You may need urgent medical attention.
If you take too much Rythmodan, you may feel cold and dizzy, light-headed, weak or
you may faint. You may also experience palpitations (your heart may feel like it "skips
a beat") and have difficulty breathing. You may notice your pulse is rapid and weak.
While you are taking it
Things you must do
Tell all the doctors, dentists, and pharmacists who are treating you that you are
If you are about to be started on any new medicine, tell your doctor, dentist or pharmacist
that you are taking Rythmodan.
If you plan to have surgery that needs a general anaesthetic, tell your doctor or
dentist that you are taking Rythmodan.
Rythmodan may cause hypoglycaemia (low blood sugar) in some people.
Patients with congestive heart disease or diabetes should be aware of the signs (see
side effects) and if the signs appear eat or drink a food containing sugar and call
Rythmodan may cause dryness of the mouth, nose and throat.
For temporary relief of mouth dryness melt bits of ice in your mouth. However, if
dryness continues for more than 2 weeks, check with your medical doctor or dentist.
If you become pregnant while taking Rythmodan, tell your doctor or pharmacist.
Things you must not do
Do not give Rythmodan to anyone else, even if they have the same condition as you.
Do not take Rythmodan to treat any other complaints unless your doctor or pharmacist
tells you to.
Do not stop taking Rythmodan, or lower the dosage, without checking with your doctor
Things to be careful of
Be careful driving or operating machinery until you know how Rythmodan affects you.
It may cause dizziness, light-headedness or fainting in some people. Make sure you
know how you react to it before you drive a car, operate machinery, or do anything
else that could be dangerous if you are dizzy or light-headed. If this occurs do not
The effects of alcohol could be made worse while taking Rythmodan. It is not recommended
that you drink alcohol while taking Rythmodan.
Alcohol may make the low blood sugar (hypoglycaemia) effect worse and/or increase
the possibility of dizziness or fainting.
All medicines have some unwanted side effects. Sometimes they are serious, but most
of the time they are not. Your doctor or pharmacist has weighed the risks of using
this medicine against the benefits they expect it will have for you.
Do not be alarmed by this list of possible side effects.
You may not experience any of them.
Tell your doctor or pharmacist as soon as possible if you do not feel well while you
are taking Rythmodan.
Tell your doctor or pharmacist if you notice any of the following and they worry you:
Dry mouth, eyes, nose or throat
Bloating or stomach pain
Constipation or diarrhoea
Frequent urge to urinate
Loss of appetite
Nausea and vomiting
Increased skin sensitivity to light
These are mild side effects of this medicine and usually short-lived.
Tell your doctor or pharmacist as soon as possible if you notice any of the following:
Redness, itching, swelling, blistering, itchy or raised skin rash, and/or hives
Dizziness, light-headedness or fainting
Fast or irregular heartbeat
Shortness of breath
Swelling of feet or lower legs
Frequent infections such as sore throat or fever
Yellowing of the skin and/or eyes
Hypoglycaemia (low blood sugar). The signs and symptoms of hypoglycaemia are: chills,
cold sweats, confusion, cool and pale skin, drowsiness, headache, fast heartbeat,
excessive hunger, nausea, shakiness, unusual tiredness/weakness.
These may be serious side effects of Rythmodan. You may need urgent medical attention.
Tell your doctor or pharmacist if you notice anything else that is making you feel
Other side effects not listed above may occur in some patients.
Do not be alarmed by this list of possible side effects.
You may not experience any of them.
Ask your doctor or pharmacist to answer any questions you may have.
After taking it
If you have any queries about any aspect of your medicine, or any questions regarding
the information in this leaflet, discuss them with your doctor or pharmacist.
Keep your capsules in the pack until it is time to take them.
Keep your capsules in a cool dry place where the temperature stays below 30°C. Do
not store it or any other medicine in the bathroom or near a sink.
Do not leave it in a car or on a windowsill.
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 or pharmacist tells you to stop taking Rythmodan or the capsules have
passed their expiry date, ask your pharmacist what to do with any that are left over.
Return any unused medicine to your pharmacist.
What it looks like
Rythmodan 100mg capsules are green and beige, marked with RY on one part and RL on
Rythmodan 150mg capsules# are white, marked with RY on one part and 150 on the other.
Rythmodan is available in blister packs of 100 capsules.
Rythmodan capsules contain either 100mg or 150mg of disopyramide, as the active ingredient.
Each capsule also contains: magnesium stearate, maize starch, purified talc, gelatin,
titanium dioxide. The 100mg capsules also contain yellow iron oxide and indigo carmine.
Rythmodan does not contain lactose, sucrose, gluten, tartrazine or azo-dyes.
Rythmodan is supplied in Australia by:
sanofi-aventis australia pty ltd
12-24 Talavera Road
Rythmodan is supplied in New Zealand by:
sanofi-aventis new zealand limited
Level 8, 56 Cawley Street
Australian Registration Numbers:
AUST R 13537
AUST R 13538
New Zealand Registration Numbers:
Date of preparation: