Consumer Medicine Information
What is in this leaflet
This leaflet answers some common questions about SINEMET CR. 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
SINEMET CR 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 SINEMET CR is used for
SINEMET CR is used to treat some of the symptoms of Parkinson's disease. This is a
disease of the nervous system that mainly affects body movement. The three main symptoms
are shaking (tremor), muscle stiffness and slow and unsteady movement. People with
Parkinson's disease often walk with a shuffle as they have difficulty in initiating
movement. If untreated, Parkinson's disease can cause difficulty in performing normal
SINEMET CR is most helpful in improving slow movement and muscle stiffness. It is
also frequently helpful in treating shaking, difficulty in swallowing and drooling.
The symptoms of Parkinson's disease are caused by a lack of dopamine, a naturally
occurring chemical produced by certain brain cells. Dopamine relays messages in the
part of the brain that controls muscle movement.
When too little dopamine is produced slowness of movement results.
SINEMET CR contains two active ingredients, levodopa and carbidopa. Levodopa is a
chemical closely related to dopamine which allows the body to make its own dopamine.
Carbidopa makes sure that enough levodopa gets to the brain where it is needed. SINEMET
CR is formulated to slowly release the levodopa and carbidopa. This keeps the amount
of levodopa in your brain as even as possible. In many patients, SINEMET CR reduces
some of the symptoms of Parkinson's disease.
Your doctor may have prescribed SINEMET CR for another reason. Ask your doctor if
you have any questions about why SINEMET CR has been prescribed for you.
Before you take SINEMET CR
When you must not take it
Do not take SINEMET CR if:
you have an allergy to SINEMET CR or any of the ingredients listed at the end of this
you have any unusual skin lumps or moles which have not been examined by your doctor,
or if you have ever had skin cancer or melanoma
you have a type of glaucoma called narrow-angle glaucoma
are being treated for depression with certain medicines called monoamine oxidase (MAO)
Ask your doctor or pharmacist if you are not sure whether you are taking one of these
you are breast-feeding or plan to breast-feed.
It has been shown that one of the active ingredients of SINEMET CR passes into breast
milk. Therefore, because of the potential harm to the baby, SINEMET CR should not
be used during breast-feeding.
the packaging is torn or shows signs of tampering
the expiry date on the pack has passed.
If you take this medicine after the expiry date has passed, it may not work.
If you are not sure whether you should start taking SINEMET CR, talk to your doctor.
Do not give SINEMET CR to a child or teenager below the age of 18, unless advised
by the child's doctor.
The safety and effectiveness of SINEMET CR in children and teenagers under 18 years
of age has not been established.
Before you start to take it
Tell your doctor if:
1. you are pregnant or intend to become pregnant.
Your doctor will discuss the possible risks and benefits of using SINEMET CR during
2. you have or have had any medical conditions, especially the following:
depression or mental disturbances
heart disease, including irregular heartbeat, also known as arrhythmia
lung disease, including asthma
kidney, liver or hormonal problems
convulsions or fits
peptic ulcer disease
3. you or your family member/caregiver notices you are developing urges to gamble, increased
sexual urges, excessive eating or spending, medicine use or repetitive purposeless
activities with other medicines for Parkinson's Disease, and/or other intense urges
that could harm yourself or others. These behaviours are called impulse control disorders.
Your doctor may need to review your treatments.
4. you have previously been or are currently being treated with levodopa.
5. you have any allergies to any other medicines or any other substances such as foods,
preservatives or dyes.
If you have not told your doctor about any of the above, tell them before you take
any SINEMET CR.
Taking other medicines
Tell your doctor 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 SINEMET CR may interfere with each other. These include:-
some medicines used to treat high blood pressure
some medicines used to treat depression
some medicines used to treat psychiatric problems
some medicines used to treat diseases related to involuntary movements
some medicines used to treat muscle spasms
phenytoin, a medicine used to treat convulsions
isoniazid, a medicine used to treat tuberculosis
selegiline, another medicine used to treat Parkinson's disease
iron supplements and multivitamins containing iron.
These medicines may be affected by SINEMET CR, or may affect how well the tablets
work. You may need different amounts of your medicine, or you may need to take different
Your doctor or pharmacist has more information on medicines to be careful with or
avoid while taking SINEMET CR.
How to take SINEMET CR
How much to take
Take SINEMET CR only when prescribed by your doctor.
Your doctor will tell you how many tablets to take each day. This depends on the severity
of your condition, your response to treatment and whether you are taking other medicines.
The dose varies considerably from patient to patient. Most patients need 2-8 tablets
per day, taken in divided doses.
Follow all directions given to you by your doctor carefully.
They may differ from the information contained in this leaflet.
If you do not understand the instructions on the bottle, ask your doctor or pharmacist
How to take it
Swallow SINEMET CR whole, with a glass of water.
Do not chew or crush the tablets.
If the tablets are crushed or chewed, they will no longer have their slow-release
How long to take it
SINEMET CR helps control some of your symptoms of Parkinson's disease, but does not
cure it. Therefore SINEMET CR must be taken every day. Continue taking SINEMET CR
for as long as your doctor prescribes.
Do not stop taking SINEMET CR, or lower the dosage, without checking with your doctor.
Your doctor may want you to gradually reduce the amount of SINEMET CR you are using
before stopping completely. This may help reduce the possibility of withdrawal symptoms
such as muscle stiffness, fever and mental changes.
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 tablet(s) as you would normally.
If you are not sure whether to skip the dose, talk to your doctor or pharmacist.
Do not take a double dose to make up for the dose that you missed.
If you have trouble remembering to take your tablets, ask your pharmacist for some
If you take too much (overdose)
Immediately telephone your doctor or 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 SINEMET CR. Do this even if there are no signs
of discomfort or poisoning.
While you are using SINEMET CR
Things you must do
If you feel light-headed, dizzy or faint, get up slowly when getting out of bed or
Although rare, you may feel light-headed or dizzy while taking SINEMET CR. This is
because your blood pressure is falling suddenly.
Standing up slowly, especially when you get up from the bed or chairs, will help your
body get used to the change in position and blood pressure. If this problem continues
or gets worse, tell your doctor.
If you are about to be started on any new medicine, tell your doctor and pharmacist
that you are taking SINEMET CR.
If you experience times where SINEMET CR does not appear to be working as well as
it did previously, tell your doctor.
After taking this medicine for long periods of time, such as a year or more, some
people suddenly lose the ability to move. This loss of movement may last from a few
minutes to several hours. The person is then able to move as before. This condition
may unexpectedly occur again and again. This problem is called the "on-off" effect.
Your doctor may prescribe you a stronger dose of SINEMET CR or may ask you to take
it more frequently. Your doctor may need to prescribe you a different medicine.
Have blood tests when your doctor says to make sure SINEMET CR is not causing any
problems with your blood, liver, kidneys or heart.
If you plan to have surgery that needs a general anaesthetic, tell your doctor or
dentist that you are taking SINEMET CR.
If you become pregnant while taking SINEMET CR, tell your doctor.
Things you must not do
Do not give SINEMET CR to anyone else, even if they have the same condition as you.
Things to be careful of
Be careful when driving or operating machinery until you know how SINEMET CR affects
SINEMET CR may cause dizziness or light-headedness in some people. Make sure you know
how you react to SINEMET CR before you drive a car, operate machinery, or do anything
else that could be dangerous if you are dizzy or light-headed. If you drink alcohol,
dizziness or light-headedness may be worse.
In addition, in very rare cases, SINEMET CR may cause excessive sleepiness and sudden
onset of sleep. If you experience these effects, do not drive or operate machinery
until these effects have resolved.
Be careful not to eat a diet high in protein.
The amount of levodopa absorbed by the body may be impaired if you eat a diet high
in protein. Ask your doctor, pharmacist or dietician to check your diet.
If you are diabetic, check with your doctor or pharmacist before using urine sugar
SINEMET CR may cause false test results with some urine sugar tests.
Tell your doctor or pharmacist as soon as possible if you do not feel well while you
are taking SINEMET CR.
SINEMET CR helps most people with Parkinson's disease, but it may have unwanted side
effects in a few people. 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 have.
Tell your doctor if you notice any of the following and they worry you:
abnormal uncontrolled movements, which may or may not resemble your Parkinson's symptoms
feeling sick (nausea), vomiting, loss of appetite
dizziness, light-headedness when standing quickly
discolouration of urine, sweat and/or saliva
dream abnormalities, sleeping difficulty
sleepiness or sudden onset of sleep
Tell your doctor if you experience any of these behaviours:
You may experience an inability to resist the impulse to perform an action that could
be harmful, which may include:
strong impulses to gamble
increased sexual drive
uncontrollable excessive shopping or spending
taking medicines and repetitive purposeless activities
and/or other urges
Most of these are the more common side effects of SINEMET CR. For the most part, these
have been mild.
Tell your doctor immediately if you notice any of the following:
difficult or painful urination
changes in mood such as depression
signs of anaemia, such as tiredness, being short of breath, and looking pale
signs of frequent or worrying infections such as fever, severe chills, sore throat
or mouth ulcers
bruising or bleeding more easily than normal, nose bleeds
skin rash, itchiness
pinkish, itchy swellings on the skin, also called hives or nettle rash
numbness or tingling in the hands or feet
signs of melanoma, such as new skin spots or changes to the size, shape, colour or
edges of an existing skin spot, freckle or mole.
These are serious side effects. You may need urgent medical attention. Serious side
effects are generally rare.
Tell your doctor immediately or go to accident and emergency at your nearest hospital
if you notice any of the following:
swelling of the face, lips, mouth, throat or tongue which may cause difficulty in
swallowing or breathing
vomiting blood or material that looks like coffee grounds
bleeding from the back passage, black sticky bowel motions (stools) or bloody diarrhoea
fast or irregular heartbeats, also called palpitations
it becomes impossible to empty your bladder (urinary retention)
mental changes such as feeling very fearful or paranoid, hallucinations
muscle stiffness accompanied by fever
shortness of breath, difficulty breathing.
These are all serious side effects that need urgent medical attention. Serious side
effects are generally rare.
Other side effects not listed above may also occur in some patients. Tell your doctor
if you notice any other effects.
Do not be alarmed by this list of possible side effects. You may not experience any
After using SINEMET CR
Keep your tablets in the bottle until it is time to take them.
If you take the tablets out of the bottle, they may not keep well.
Keep SINEMET CR 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 the car or on window sills.
Heat and dampness can damage 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 SINEMET CR or the tablets have passed their
expiry date, ask your pharmacist what to do with any that are left over.
AUST R NUMBER: 171694
What it looks like
SINEMET CR comes as a dappled purple coloured, oval-shaped tablet plain on one side
with '521' on the other.
A bottle of SINEMET CR contains 100 tablets.
SINEMET CR - 50 mg carbidopa and 200 mg levodopa per tablet.
Allura Red AC
SINEMET CR tablets do not contain lactose, gluten, sucrose, tartrazine or any other
SINEMET CR is supplied in Australia by:
Merck Sharp & Dohme (Australia) Pty Limited
Level 1, Building A,
26 Talavera Road
This leaflet was prepared in September 2019.