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HALF SINEMET CR 25MG/100MG TABLETS

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PACKAGE LEAFLET: INFORMATION FOR THE USER
®

HALF SINEMET CR 25mg/100mg TABLETS
(carbidopa and levodopa)
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.
The name of your medicine is HALF SINEMET CR 25mg/100mg TABLETS but will be referred to as Half
Sinemet CR throughout this leaflet. Please note that this leaflet also contains information about the other
strength Sinemet CR 50mg/200mg Prolonged-Release Tablets.
In this leaflet:
1 What Half Sinemet CR is and what it is used for
2 Before you take Half Sinemet CR
3 How to take Half Sinemet CR
4 Possible side effects
5 How to store Half Sinemet CR
6 Further information

1 What Half Sinemet CR is and what it is used for
Half Sinemet CR improves the signs of Parkinson’s disease. Parkinson’s disease is a long-term illness
where:
you become slow and unsteady
your muscles feel stiff
you may develop shaking or trembling (called ‘tremor’).
If not treated, Parkinson’s disease can make it hard for you to continue your normal daily activities.
Half Sinemet CR contains two different medicines called: levodopa and carbidopa.
levodopa turns into a material called ‘dopamine’ in your brain. The dopamine helps to improve the signs
of your Parkinson’s disease.
carbidopa belongs to a group of medicines called ‘aromatic amino acid decarboxylase inhibitors’. It helps
levodopa work more effectively by slowing the speed at which levodopa is broken down in your body.

2 Before you take Half Sinemet CR
Do not take Half Sinemet CR if:
you are allergic (hypersensitive) to carbidopa or levodopa or any of the other ingredients of Half Sinemet
CR (listed in Section 6)
you have ever had skin cancer or you have any unusual moles which have not been examined by your
doctor
you are taking certain medicines called ‘MAOIs’ (Monoamine Oxidase Inhibitors) used for depression.
You need to stop using these medicines at least two weeks before you start Half Sinemet CR (see also
under ‘Taking other medicines’ below).
you have a condition called ‘narrow-angle glaucoma’ that may cause a sudden build up of pressure in
the eye
you have a severe mental disorder
you are pregnant, might become pregnant, or are breast-feeding.
Do not take Half Sinemet CR if any of the above apply to you. If you are not sure, talk to your doctor or
pharmacist before taking Half Sinemet CR.
Take special care with Half Sinemet CR
Check with your doctor or pharmacist before taking your medicine if:
you have a history of fits (convulsions)
you have had an ulcer in your gut (called ‘duodenal’ or ‘peptic ulcer’) or have vomited blood
you have had a heart attack, heart beat problems, circulation or breathing problems
you have had kidney, liver or hormonal problems
you have had depression or other mental problems
you have a condition called ‘chronic wide-angle glaucoma’ that may cause a build up of pressure in the
eye. You will need to have regular checks on the pressure in your eye.
you sometimes have sudden sleep attacks or sometimes feel very sleepy
you are due to have surgery.
If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking Half
Sinemet CR.
Tell your doctor if you or your family/carer notices you are developing urges or cravings to behave in ways
that are unusual for you or you cannot resist the impulse, drive or temptation to carry out certain activities
that could harm yourself or others. These behaviours are called impulse control disorders and can include
addictive gambling, excessive eating or spending, an abnormally high sex drive or an increase in sexual
thoughts or feelings. Your doctor may need to review your treatments.
Taking other medicines
Please tell your doctor or pharmacist if you are taking or have recently taken any other medicines, including
medicines obtained without a prescription. This includes herbal medicines. This is because Half Sinemet
CR can affect the way some other medicines work. Also some other medicines can affect the way Half
Sinemet CR works.
In particular tell your doctor or pharmacist if you are taking any of the following medicines:
Medicines for Parkinson’s disease containing levodopa:
- If they are ‘slow release’, you will need to wait 24 hours after your last dose before starting Half Sinemet
CR.
- If they are ‘normal release’, you will need to wait 12 hours after your last dose before starting Half
Sinemet CR.
- Tell the doctor or pharmacist even if you have only taken them in the past.
Medicines for Parkinson’s disease which do not contain levodopa will usually be continued. However,
your dose may be changed.
Medicines for mental problems (including depression), tuberculosis (TB), high blood pressure, muscle
spasms, epilepsy or other diseases related to involuntary movements. Your dose may need to be
changed.
Medicines called ‘MAOIs’ (see also ‘Do not take Half Sinemet CR if’).
Anticholinergic medicines (such as orphenadrine, trihexyphenidyl, benzatropine and procyclidine). Your
dose may need to be changed.
Phenytoin which is used to treat fits (convulsions).
Papaverine which is used to treat impotence in men.
If you are not sure if any of the above apply to you, talk to your doctor or pharmacist before taking this
medicine. Your doctor or pharmacist has a more complete list of medicines to avoid while taking Half
Sinemet CR.
Tests while you are taking Half Sinemet CR
This medication can affect some laboratory tests that your doctor may perform on blood or urine samples.
Please remind your doctor if you are taking Half Sinemet CR and are having any tests.
Taking Half Sinemet CR with food and drink
Try to avoid taking your tablets with a heavy meal. If your diet contains too much protein (meat, eggs, milk,
cheese) Half Sinemet CR may not work as well as it should.
Pregnancy and breast-feeding
Do not take Half Sinemet CR if you are pregnant, might become pregnant or are breast-feeding. Levodopa,
one of the substances in Half Sinemet CR, is passed into human milk.
Ask your doctor or pharmacist for advice before taking any medicine, if you are pregnant or breast-feeding.
Driving and using machines
Half Sinemet CR affects different people in different ways. Some people have side effects which affect
their ability to drive or use tools or machines. (see Section 4 ‘Possible side effects’). Do not drive or use
tools or machines if you get these effects.
Half Sinemet CR can also make you sleepy or cause ‘sudden sleep attacks’. If this happens to you, you
must not drive or use tools or machines. Your doctor will tell you if you can start driving again if these
attacks stop.

3 How to take Half Sinemet CR
Always take Half Sinemet CR 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. You must swallow your tablets whole. Do not break, crush or chew the
tablets.
Although your medicine can have an effect after one day, it may take up to seven days to work.
Take them at regular time intervals according to your doctor’s instructions.
Do not change the times at which you take your tablets or take any other medicines for Parkinson’s
disease without first consulting your doctor. You should not take Half Sinemet CR or Half Sinemet CR
tablets at intervals of less than 4 hours apart.
Try to avoid taking your tablets with a heavy meal.

If you have not had levodopa before
The usual starting dose for Half Sinemet CR is one tablet twice a day.
If you have had levodopa before
your doctor will ask you to stop taking your medicine for Parkinson’s disease for 8 hours before you start
taking Half Sinemet CR.
The usual starting dose for Half Sinemet CR is one tablet twice a day. Your doctor may ask you to take Half
Sinemet CR to help in determining the correct dose.
A combination of more than one Sinemet or Half Sinemet CR product may be prescribed by your doctor. If
you have been given different Sinemet or Half Sinemet CR tablets to take make sure that you are taking the
correct one at the right time. Remember: Half Sinemet CR is a lower dose tablet than Sinemet CR.
Children under 18 years of age
Half Sinemet CR is not suitable for children under the age of 18 years.
If you take more Half Sinemet CR than you should
If you take too many tablets see your doctor immediately.
If you forget to take Half Sinemet CR
Do not take a double dose to make up for a forgotten dose.
If you stop taking Half Sinemet CR
Do not stop taking Half Sinemet CR or change your dose without talking to your doctor first. When you stop
taking Half Sinemet CR the following can occur: stiff muscles, high temperature (fever) and mental
changes.
If you have any further questions on the use of this product, ask your doctor or pharmacist.

4 Possible side effects
Like all medicines, Half Sinemet CR can cause side effects, although not everybody gets them.
Stop taking Half Sinemet CR and see your doctor straight away, if you notice any of the following
side effects:
allergic reaction, the signs may include hives (nettle rash), itching, rash, swelling of your face, lips,
tongue or throat. This may cause difficulty in breathing or swallowing
chest pain
uneven (irregular) heart beat or palpitations
dizziness on standing-up quickly
bleeding from your gut which may be seen as blood in your faeces or darkened faeces (gastro-intestinal
bleeding)
blood problems, the signs may include pale skin (pallor), tiredness, fever, sore throat or mild bruising
and prolonged bleeding after injury
stiff muscles, high fever
mental changes including delusions, hallucinations and depression
fits (convulsions).
The most common side effects are
abnormal movements such as twitching or spasms (which may or may not be like your Parkinson’s
symptoms)
nausea
Other side effects include
fainting, anorexia, high blood pressure
inflammation of the veins, being sick (vomiting) diarrhoea, discoloration of urine, sweat or saliva
on-off phenomenon, characteristic of some people with long-standing Parkinson’s disease. This is when
you can have unpredictable changes from being mobile – ‘on’ - to a sudden inability to move – ‘off’.
‘Off’ to ‘on’ can occur just as suddenly.
dizziness; sleepiness (including excessive drowsiness or sudden sleep onset episodes), pins and needles
dream abnormalities, confusion, feeling agitated, shortness of breath, hair loss.
You may experience the following side effects:
inability to resist the impulse to perform an action that could be harmful, which may include:
o strong impulse to gamble excessively despite serious personal or family consequences
o altered or increased sexual interest and behaviour of significant concern to you or to others, for
example, an increased sexual drive
o uncontrollable excessive shopping or spending
o binge eating (eating large amounts of food in a short time period) or compulsive eating (eating more
food than normal and more than is needed to satisfy your hunger)
Tell your doctor if you experience any of these behaviours; he/she will discuss ways of managing or
reducing the symptoms.
Side effects that have been reported with medicines containing levodopa.
These may be experienced when taking Half Sinemet CR.
Nervous system:
loss of control over the voluntary movements of everyday life
numbness, increased hand tremor, muscle twitching, muscle cramp, irregular movement of jaw muscles
resulting in difficulty opening the mouth
difficulty sleeping, feeling anxious or high, falling over and abnormal walking patterns
headache
Eyes:
drooping eyelid and dilated pupil
changes in vision, irregular movement of the eye
Digestive system:
indigestion, dry mouth, bitter taste
swelling of the salivary glands, difficulty swallowing, grinding of the teeth
hiccups, abdominal pain and distress, constipation, wind
burning sensation of the tongue.
Sexual:
persistent abnormal erection of the penis
Urinary:
difficulty passing urine or incontinence (inability to control urine flow)
Skin:
changed patches of pigmented skin, including, irritated or irregular moles, or moles in which you have
noticed changes (melanoma)
General:
weight gain or loss, swelling in the limbs
flushing, hot flushes, increased sweating
feeling weak, faint or tired
hoarseness, general feeling of being unwell
increased energy or activity, unusual breathing pattern
If any symptoms persist or you experience any other side effects please tell your doctor or pharmacist.
It will help if you make a note of what you experienced, when it started and how long it lasted.
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 www.mhra.gov.uk/yellowcard
By reporting side effects you can help provide more information on the safety of this medicine.

5 How to store Half Sinemet CR
Do not store above 30°C. Store in the original package.
Keep your medicine out of the sight and reach of children.
Please check the expiry date of the product. Do not use after the expiry date stated on the pack.
If you are told to stop taking this medicine, return any unused tablets to your pharmacist.
If your medicine becomes discoloured or show any signs of deterioration, you should seek the advice of
your pharmacist.

6 Further information
What Half Sinemet CR contains
Each tablet contains 100mg levodopa and carbidopa equivalent to 25mg anhydrous carbidopa in
prolonged-release tablets. Half Sinemet CR Tablets also contain the following: hydroxypropylcellulose,
magnesium stearate, poly (vinyl acetate-crotonic acid) copolymer, red iron oxide E172.
What Half Sinemet CR looks like and contents of the pack
Half Sinemet CR is a pink-coloured, oval, biconvex compressed tablet engraved '601' on one side and plain
on the other side. Half Sinemet CR Tablets are available as blister packs of 30 tablets.
Manufactured by: Merck Sharp & Dohme Italy.
Procured from within the EU and repackaged by the Product Licence holder: B&S Healthcare, Unit 4,
Bradfield Road, Ruislip, Middlesex, HA4 0NU, UK.
HALF SINEMET® CR 25mg/100mg TABLETS; PL No: 18799/1603 POM
Leaflet date: 06.07.2015
SINEMET is a registered trademark of Merck, Sharp and Dohme Ltd.

Expand Transcript

Source: Medicines and Healthcare Products Regulatory Agency

Disclaimer: Every effort has been made to ensure that the information provided here is accurate, up-to-date and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This information has been compiled for use by healthcare practitioners and consumers in the United States. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective or appropriate for any given patient. If you have questions about the substances you are taking, check with your doctor, nurse or pharmacist.

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