Consumer medicine information


Contains the active ingredient digoxin

Consumer Medicine Information

What is in this leaflet

This leaflet answers some common questions about SIGMAXIN.

It does not contain all the available information.

It does not take the place of talking to your doctor or pharmacist.

All medicines have risks and benefits.

Your doctor has weighed the risks of you taking SIGMAXIN 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.


SIGMAXIN belongs to a group of medicines known as cardiac glycosides.
They work by slowing down the rate while increasing the force of your
heart when it beats.

It is used to treat certain heart problems, such as:

Chronic Heart failure
Heart failure is when your
heart can’t pump strongly enough to supply blood needed through
out the whole body. It is not the same as a heart attack and does
not mean that your heart stops.

Certain type of irregular heart beats
Irregular heart
rhythms caused by an electrical problem in the upper chamber of your
heart. They cause your heart to beat too fast or in an uneven way.

Your doctor may have prescribed SIGMAXIN for another reason.

Ask your doctor if you have any questions about why SIGMAXIN
has been prescribed for you.

There is no evidence that SIGMAXIN is addictive.

Before you take SIGMAXIN

When you must not take it

Do not take SIGMAXIN if you have an allergy to:

  • digoxin or other cardiac glycosides
  • any of the ingredients listed at the end of this

Symptoms of an allergic reaction to SIGMAXIN may include:

  • shortness of breath, wheezing or difficulty breathing
  • swelling of the face, lips, tongue or other parts
    of the body
  • skin rash, itching or hives

Do not take SIGMAXIN if you have or have had any of the following
medical conditions:

  • intermittent or complete heart block or second
    degree atrioventricular block, (conditions where the heart misses
    beats) especially if there is a history of Stokes-Adams attacks.
  • ventricular tachycardia and ventricular fibrillation
    (a type of irregular heart rhythm).
  • irregular heart rhythm caused by cardiac glycoside
  • certain other irregularities of heart rhythm.

If you are not sure whether you should start taking SIGMAXIN,
talk to your doctor or pharmacist.

Do not take SIGMAXIN after the expiry date (EXP) printed on
the pack.

Do not take SIGMAXIN if the packaging is torn or shows signs
of tampering.

If it has expired or is damaged, return it to your pharmacist
for disposal.

Before you start to take it

Tell your doctor if you have allergies to:

  • any other medicines
  • any other substances, such as foods, preservatives
    or dyes

Tell your doctor if you are pregnant or intend to become pregnant. Pregnant women may require an adjustment of the dose of SIGMAXIN
during pregnancy. SIGMAXIN may have harmful effects on the developing
baby if the dose is too high.

Tell your doctor if you are breast-feeding or plan to breast-feed.

Tell your doctor if you have or have had any medical conditions,
especially the following:

  • Heart disease
  • Heart disease caused by lack of vitamin B, known
    as ‘Beri-Beri disease’
  • Lung problems
  • Liver or kidney problems – effect of SIGMAXIN may
    be increased because of slower removal from the body
  • Thyroid disease – patients with low or high thyroid
    gland activity may be more or less sensitive to the effects of SIGMAXIN
  • High or Low levels of calcium, potassium in your
  • Low level of magnesium in your blood
  • Digestion problems

If you have not told your doctor or pharmacist about any of
the above, it is important to tell them before you start taking SIGMAXIN.

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 shop.

Some medicines and SIGMAXIN may interfere with each other.

These include:

  • amphetamine, appetite suppressants, medicines for
    colds, sinus problems, hay fever or other allergies – may increase
    the risk of heart rhythm problems
  • medicines for heart problems, including high blood
    pressure (hypertension) and irregular heart beat (arrhythmia)
  • diuretics (water tablets),
  • potassium supplements
  • medicines for cancer
  • medicines for depression
  • medicines for bacterial infection (antibiotics)
  • medicines for fungal infections (antifungals)
  • medicines for stomach problems, including for nausea,
    vomiting, diarrhoea or indigestion
  • some laxatives
  • medicines for relieving asthma attacks or other
    breathing problems
  • corticosteroids (e.g. hydrocortisone, dexamethasone,
    prednisolone, prednisone)
  • medicines for diabetes (e.g. insulin, glucagon)
  • cholestyramine, a medicine used for high cholesterol
  • phenytoin, a medicine used to control epilepsy
  • indomethacin – medication used for inflammation,
    gout or arthritis
  • St John’s Wort

St John’s Wort may interfere with SIGMAXIN.

These medicines may be affected by SIGMAXIN, 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 will advise

If you not sure if any of the above apply to you, talk to your
doctor or pharmacist before taking SIGMAXIN.

How to take SIGMAXIN

Follow all directions given to you by your doctor or pharmacist
They may differ from the information contained in this leaflet.

If you do not understand the instructions on the pack, ask your
doctor or pharmacist for help.

How much to take

Your doctor or pharmacist will tell you how much SIGMAXIN you
will need to take each day. This depends on your condition and whether
or not you are taking any other medicines.

How to take it

Swallow SIGMAXIN tablets with a glass of water.

After you begin taking SIGMAXIN your doctor may sometimes check
its level in your blood. This will help your doctor find out if your
dose needs to be changed.

Do not change your dose of SIGMAXIN unless your doctor tells
you to do so.

When to take it

Take SIGMAXIN at same time each day. Taking SIGMAXIN 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 SIGMAXIN before or after food.

If you forget to take it

Take it as soon as you remember. However, if it is almost time
for your next dose, skip the dose you missed and take your next dose
when you are meant to.

Do not take a double dose to make up for the dose that you
This may increase the chance of you getting an unwanted side

If you are not sure what to do, ask your doctor or pharmacist.

How long to take it

Continue taking SIGMAXIN for as long as your doctor tells
SIGMAXIN helps control your condition, but does not cure it.
Therefore, you must take SIGMAXIN every day.

If you take too much (Overdose)

Immediately telephone your doctor or the Poisons Information
Centre (telephone 13 11 26), or go to Accident and Emergency at your
nearest hospital, if you think that you or anyone else may have taken
too much SIGMAXIN. Do this even if there are no signs of discomfort
or poisoning.

You may need urgent medical attention.

Symptoms of an overdose to SIGMAXIN include some of the side
effects listed below.

Some early warning signs of overdose are loss of appetite, nausea,
vomiting, diarrhoea, or extremely slow heart beat.

In infants and small children, the earliest signs of overdose
are changes in the rate and rhythm of the heart beat.

Children may not show the other symptoms as soon as adults.

While you are using SIGMAXIN

Things you must do

Tell your doctor immediately if you notice any side effects

Tell any other doctors, dentists, and pharmacists who are treating
you that you are taking SIGMAXIN.

You must tell your doctor, dentist, or pharmacist that you are
taking SIGMAXIN before you start taking any medicines you buy from
a pharmacy, health food shop or supermarket.

If you plan to have surgery that needs a general anaesthetic,
tell your doctor or dentist that you are taking SIGMAXIN.

If you become pregnant while taking SIGMAXIN, tell your doctor

If you need to have any medical tests while you are taking
SIGMAXIN, tell your doctor.
SIGMAXIN may affect the results of some tests.

Be sure to keep all of your doctor’s appointments so
that your progress can be checked.
Your doctor will check your progress and may want to take
some blood tests from time to time. This helps to prevent unwanted
side effects.

Things you must not do

Do not give SIGMAXIN to anyone else, even if their symptoms
seem similar or they have the same condition as you.

Do not take SIGMAXIN to treat any other complaints unless your
doctor tells you to.

Do not stop taking SIGMAXIN, or change the dose, even if you
are feeling better, without checking with your doctor.

Things to be careful of

Be careful driving or operating machinery until you know how
SIGMAXIN affects you.
SIGMAXIN may cause dizziness, blurred vision, and faintness
in some patients. Make sure you know how you react to SIGMAXIN, before
you drive a car, operate machinery, or do anything else that could
be dangerous if this happens.

Side effects

All medicines can have side effects. Sometimes they are serious,
most of the time they are not. You may need medical treatment if you
get some of the side effects.

Ask your doctor or pharmacist to answer any questions you may

If any of the following happen, tell your doctor or pharmacist

  • nausea or vomiting, loss of appetite
  • diarrhoea
  • lower stomach pain
  • slow or irregular heart beats (may be fast in children)
  • unusual tiredness or extreme weakness
  • general feeling of ‘unwellness’
  • blurred vision or visual disturbances (e.g. coloured
    halos around objects ie. yellow, green, or white)
  • depression
  • headache
  • mental disturbances, such as confusion or feeling
  • skin rash
  • painful, swollen breasts, or breast enlargement
    in men
  • bleeding or bruising more easily than normal

These may be serious side effects. You may need urgent medical
attention. Serious side effects are rare or are caused by a dose of
SIGMAXIN that is too high for you.

Tell your doctor immediately if you have:

  • Palpitations
  • Chest pain
  • Shortness of breath or sweating

These can be symptoms of a serious heart problem caused by new
irregular heart beats of a different type to those caused by atrial
fibrillation (which SIGMAXIN is often used to treat). If these happen,
tell your doctor immediately.

Your doctor may do regular checks on your blood levels of digoxin
and body salts, as well as your kidney function to make sure SIGMAXIN
is working safely for you.

This is not a complete list of side effects. Tell your doctor
if you notice anything else that is making you feel unwell, even if
it is not on this list.

Do not be alarmed by this list of possible side effects. You may not experience any of them.

After taking SIGMAXIN


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.

Keep your SIGMAXIN tablets in the pack until it is time to
take them.
If you take the tablets out of the pack, they will not keep

Store SIGMAXIN Tablets in a cool, dry place away from light
and where temperature stays below 25 °C.

Do not store SIGMAXIN or any other medicine in the bathroom
or near a sink.

Do not leave it in the car on hot days or on windowsills. Heat and dampness can destroy some medicines.


If your doctor tells you to stop taking SIGMAXIN has passed
its expiry date, ask your pharmacist what to do with any that is left

Product description

What it looks like

Tablets: (oral)
SIGMAXIN PG Tablets 62.5mcg,
blue, biconvex, round tablet coded “U3A” on the upper
face, bottom face plain; in bottles of 200.

SIGMAXIN Tablets 250mcg: white, biconvex, round tablet,
scored and coded “X3A” on the upper face, bottom face
plain; in blister packs of 100.


Active ingredient:

  • Digoxin

Other ingredients:

SIGMAXIN Tablets: lactose, maize starch, rice starch, and magnesium

SIGMAXIN PG Tablets also contain povidone and indigo carmine
– Cl73015

The Australian Product Registration Numbers for:
Tablets: AUST R 90116
SIGMAXIN PG Tablets: AUST R 90114


Sigma Pharmaceuticals (Australia) Pty Ltd
96 Merrindale
Croydon Victoria 3136
Telephone: (03)
– 9839 2800

This leaflet was prepared in May 2002 and updated in January

Published by MIMS April 2009