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Rythmodan® Retard 250mg Tablets
(disopyramide phosphate)
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 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 gets serious, or if you notice any side effects not
listed in this leaflet, please tell your doctor or pharmacist.
This medicine is available using above name but will be referred to as
Rythmodan Retard throughout the leaflet.
In this leaflet:
1. What Rythmodan Retard are and what they are used for
2. Before you take Rythmodan Retard
3. How to take Rythmodan Retard
4. Possible side effects
5. How to store Rythmodan Retard
6. Further information
The name of your medicine is Rythmodan Retard 250mg Tablets (called
Rythmodan Retard in this leaflet). Rythmodan Retard contains a medicine
called disopyramide. This belongs to a group of medicines called antiarrhythmic agents.
It works by controlling the uneven beating of your heart and returns it to the
normal rhythm.
It is used for controlling your heartbeat in the following situations:
- Arrhythmias - where your heartbeats are uneven, or unusually fast or slow
- To keep your heart beating at a normal rhythm
- To stop unusual heartbeats (arrhythmias) happening after a heart attack
- To stop unusual heartbeats (arrhythmias) during an operation
Do not take Rythmodan Retard if:
- You are allergic (hypersensitive) to disopyramide or any of the other
ingredients of Rythmodan Retard (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.
- You have any other heart problems, - apart from unusual heartbeats
- You are taking other medicines to control your heart rhythm (see section
below ‘Taking other medicines’)
- You are taking other medicines which could cause unusual heartbeats
(see section below ‘Taking other medicines’)
- You have any kidney or liver problems
Do not take this medicine if any of the above apply to you. If you are not
sure, talk to your doctor or pharmacist before taking Rythmodan Retard.
Take special care with Rythmodan Retard
Check with your doctor or pharmacist before taking your medicine if:
- You have low levels of potassium in your blood (called hypokalaemia)
- You have low blood sugar levels. This can happen if you have diabetes, a
low body weight, a poor diet or if you are elderly
- You have glaucoma (an eye condition often caused by an abnormally high
pressure in the eye) or if you or someone in your family have ever had
glaucoma. Your doctor may perform an eye pressure test before
prescribing Rythmodan
- You have an enlarged prostate
- You have a disease which causes muscle weakness (myasthenia gravis)
- You are elderly and have problems with your memory or attention span, or
sometimes have difficulty thinking clearly
- You have constipation or take any medication that causes constipation
If you are not sure if any of the above applies to you, talk to your doctor or
pharmacist before taking Rythmodan Retard.
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 Rythmodan Retard
can affect the way some other medicines work.
Also some medicines can affect the way Rythmodan Retard works.

In particular, do not take this medicine, and tell your doctor if:
If you are taking any of the following medicines for uneven heartbeats
- Beta-blockers such as propranolol, oxprenolol or acebutolol
- Verapamil –used for chest pain or high blood pressure
- Digoxin – also used for heart problems
If you are taking any of the following medicines that can increase the
risk of unusual heartbeats (arrhythmias) when taken at the same time
as Rythmodan Retard:
- Medicines for depression such as amitriptyline, imipramine or maprotiline
- Medicines for male sexual problems such as sildenafil, tadalafil or
- Antibiotics such as erythromycin, clarithromycin, azithromycin or
- Antihistamines such as astemizole or terfenadine
- Cisapride - used for heartburn
- Pentamidine - used for pneumonia
- Pimozide and thioridazine - used for schizophrenia
The following medicines may affect the way Rythmodan Retard works:
- Amphotericin B - used for fungal infections
- Tetracosactide - used to test some hormone problems
- Rifampicin - used for infections
- Atropine – used in eye drops and in cough and cold medicines
- Anticholinergic medicines - includes some medicines used for irritable
bowel syndrome, asthma or incontinence
- Medicines used to calm emotional or mental problems or stop you feeling
sick or being sick such as chlorpromazine or prochlorperazine
- Water tablets (diuretics) such as furosemide
- Corticosteroids such as hydrocortisone, betamethasone or prednisolone
- Laxatives such as bisacodyl or senna
- Medicines for epilepsy such as phenobarbital, primidone or phenytoin
Rythmodan Retard may affect the way the following medicines work:
- Medicines for HIV infections such as ritonavir, indinavir or saquinavir
- Theophylline - used for wheezing or difficulty in breathing
- Ciclosporin - used to help prevent rejection of transplants
- Warfarin - used to thin the blood
Pregnancy and breast-feeding
Talk to your doctor before taking this medicine if you are pregnant, might
become pregnant, or think you may be pregnant.
If you are breast-feeding or planning to breast-feed, talk to your doctor or
pharmacist before taking any medicine. This is because small amounts of
this medicine may pass into the mothers’ milk.
Driving and using machines
Rythmodan Retard may affect your ability to concentrate and react quickly.
You may have blurred vision or become dizzy or light-headed. If this
happens, do not drive or use any tools or machines.
Important information about some of the ingredients of Rythmodan
Sucrose and anhydrous glucose: If you have been told by your doctor that
you have an intolerance to some sugars, contact your doctor before taking
this medicinal product.
Always take Rythmodan Retard exactly as your doctor has told you. You
should check with your doctor or pharmacist if you are not sure.
Taking this medicine
- Take this medicine by mouth
- Swallow the tablets with a drink of water
- Do not break, crush or chew your tablets
- If you feel the effect of your medicine is too weak or too strong, do not
change the dose yourself, but ask your doctor.
The usual starting dose is one to one and a half tablets (250mg to 375mg)
twice a day.
Your doctor may lower your dose if you have any kidney or liver problems.
Rythmodan Retard is not suitable for use in children.
Blood tests
Your doctor may ask you to have regular blood tests to check your blood
sugar levels.

If you take more Rythmodan Retard than you should
If you take more tablets than you should, talk to a doctor or go to a hospital
casualty department straight away. Take the medicine pack with you. This is
so the doctor knows what you have taken. The following effects may
happen: dizziness, feeling tired, uneven heartbeat (palpitations), dry mouth,
difficulty in passing water (urinating), feeling or being sick, stomach pain or
fits (seizures).
If you forget to take Rythmodan Retard
Do not take a double dose to make up for a forgotten tablet.
If you stop taking Rythmodan Retard
Keep taking Rythmodan Retard until your doctor tells you to stop.
If you have any further questions about this medicine, ask your doctor or
Like all medicines, Rythmodan Retard can cause side effects, although not
everybody gets them.

What Rythmodan Retard looks like and contents of the pack
Rythmodan Retard are white, round, biconvex tablets. One side has a
break-line and is embossed '013' and ‘E’; the other side is embossed with
the Roussel logo.
Rythmodan Retard are available in blister packs of 40 and 60 tablets.
Manufactured by
Sanofi Winthrop Industrie, Route du Choisy au Bac 56, F-60205
Compiegne, France.
Erfa NV, Landbouwersstraat 25, B-1040, Brussel, Belgium,procured from
within the EU and repackaged by the Product Licence holder P.I.E. Pharma
Ltd, 207 Kenton Road, Harrow, Middlesex HA3 0HD.

PL 15361/0126

Leaflet revision and issue date (Ref.) 14.06.17[17]
Rythmodan Retard is a trademark of Aventis Pharma SA.

Tell your doctor straight away if you notice any of the following
serious side effects - you may need urgent medical treatment
- If you have an allergic reaction. The signs may include: a skin rash, swallowing
or breathing problems, swelling of your lips, face, throat or tongue.
Tell your doctor as soon as possible if you have any of the following
side effects:
- Feeling faint, dizzy or light-headed
- Palpitations or an uneven, fast or slow heartbeat that you have not had
before or that gets worse.
Tell your doctor or pharmacist if any of the following side effects gets
serious or lasts longer than a few days. Also tell them if you notice any
side effects not listed in this leaflet:
- Feeling sick (nausea) or being sick (vomiting), dry mouth, indigestion,
diarrhoea, constipation, stomach pain, loss of appetite
- Difficulty in passing urine, especially in men with prostate problems
- Difficulty in getting or maintaining an erection, or in ejaculating (impotence)
- Mood changes or mental problems
- Blurred or double vision
- Yellowing of your skin or eyes (jaundice)
- Worsening of myasthenia gravis (a disease which causes muscle
- You may get more infections than usual. This could be caused by a
lowering in the number of white blood cells (called neutropenia)
- Low blood sugar levels (hypoglycaemia). Signs include sweating,
paleness, headache, feeling faint or drowsy
- Problems with memory or attention span, difficulty thinking clearly
- In certain situations the blockage of bowel can take place when on
Rythmodan especially in the elderly, when taken with othermedicines
thatmay cause constipation or when blood level of Rythmodan is raised
due to kidney or liver problems
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 out of the sight and reach of children.
Do not store above 25oC. Protect from light.
Do not use Rythmodan Retard after the expiry date which is stated on the
carton after EXP. The expiry date refers to the last day of that month.
Do not use Rythmodan Retard if you notice your tablets are crumbling,
broken or discoloured.
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 Rythmodan Retard contains
- Each tablet contains 250mg of the active ingredient disopyramide as
disopyramide phosphate in a modified release formulation.
- The other ingredients are glyceryl stearate, anhydrous glucose, povidone,
magnesium stearate, hypromellose, propylene glycol and sucrose.

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Further information

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