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Ref: 1411/300316/1/F


Singulair 10mg film-coated tablets
(montelukast sodium)
Patient Information Leaflet
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, please 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 get serious, or if you notice any side effects not
listed in this leaflet, please tell your doctor or pharmacist.
Your medicine is called Singulair 10mg film-coated tablets but will be
referred to as Singulair throughout the leaflet.



Any patient on anti-asthma medicines should be aware that if you develop
a combination of symptoms such as a flu-like illness, pins and needles or
numbness of arms or legs, worsening of pulmonary symptoms, and/or
rash, you should consult your doctor.
You should not take acetyl-salicylic acid (aspirin) or anti-inflammatory
medicines (also known as non-steroidal anti-inflammatory drugs or
NSAIDs) if they make your asthma worse.

Use in children
For children 2 to 5 years old, Singulair Paediatric 4 mg chewable tablets and
Singulair Paediatric 4 mg granules are available.
For children 6 to 14 years old, Singulair Paediatric 5 mg chewable tablets
are available.

In this leaflet:
1 What Singulair is and what it is used for
2 Before you take Singulair
3 How to take Singulair
4 Possible side effects
5 How to store Singulair
6 Further information


What Singulair is and what it is used for

Singulair is a leukotriene receptor antagonist that blocks substances called
leukotrienes. Leukotrienes cause narrowing and swelling of airways in the
lungs and also cause allergy symptoms. By blocking leukotrienes, Singulair
improves asthma symptoms, helps control asthma and improves seasonal
allergy symptoms (also known as hay fever or seasonal allergic rhinitis).
Your doctor has prescribed Singulair to treat asthma, preventing your
asthma symptoms during the day and night.
* Singulair is used for the treatment of patients who are not adequately
controlled on their medication and need additional therapy.
* Singulair also helps prevent the narrowing of airways triggered by
* In those asthmatic patients in whom Singulair is indicated in asthma,
Singulair can also provide symptomatic relief of seasonal allergic rhinitis.
Your doctor will determine how Singulair should be used depending on the
symptoms and severity of your asthma.
What is asthma?
Asthma is a long-term disease.
Asthma includes:
* difficulty breathing because of narrowed airways. This narrowing of
airways worsens and improves in response to various conditions.
* sensitive airways that react to many things, such as cigarette smoke,
pollen, cold air, or exercise.
* swelling (inflammation) in the lining of the airways.

Taking other medicines
Some medicines may affect how Singulair works, or Singulair may affect
how other medicines work.
Please tell your doctor or pharmacist if you are taking or have recently taken
other medicines, including those obtained without a prescription.
Tell your doctor if you are taking the following medicines before starting
* phenobarbital (used for treatment of epilepsy)
* phenytoin (used for treatment of epilepsy)
* rifampicin (used to treat tuberculosis and some other infections)
* gemfibrozil (used for treatment of high lipid levels in plasma)
Taking Singulair with food and drink
Singulair may be taken with or without food.
Pregnancy and breast-feeding
Use in pregnancy
Women who are pregnant or intend to become pregnant should consult their
doctor before taking Singulair. Your doctor will assess whether you can take
Singulair during this time.
Use in breast-feeding
It is not known if Singulair appears in breast milk. You should consult your
doctor before taking Singulair if you are breast-feeding or intend to
Driving and using machines
Singulair is not expected to affect your ability to drive a car or operate
machinery. However, individual responses to medication may vary. Certain
side effects (such as dizziness and drowsiness) that have been reported
very rarely with Singulair may affect some patients’ ability to drive or operate
Important information about some of the ingredients of Singulair
Singulair contains lactose. If you have been told by your doctor that you
have an intolerance to some sugars, contact your doctor before taking this
medicinal product.

Symptoms of asthma include: Coughing, wheezing, and chest tightness.
What are seasonal allergies?
Seasonal allergies (also known as hay fever or seasonal allergic rhinitis) are
an allergic response often caused by airborne pollens from trees, grasses
and weeds. The symptoms of seasonal allergies typically may include: stuffy,
runny, itchy nose; sneezing; watery, swollen, red, itchy eyes.



Before you take Singulair


How to take Singulair

You should take only one tablet of Singulair once a day as prescribed by
your doctor.
It should be taken even when you have no symptoms or have an acute
asthma attack.
Always take Singulair as your doctor has told you. You should check with
your doctor or pharmacist if you are not sure.
To be taken by mouth.

Tell your doctor about any medical problems or allergies you have now or
have had.

For adults and adolescents 15 years of age and older:
One 10 mg tablet to be taken daily in the evening. Singulair may be taken
with or without food.

Do not take Singulair if you
* are allergic (hypersensitive) to montelukast or any of the other ingredients
of Singulair (see 6. Further information).

If you are taking Singulair, be sure that you do not take any other products
that contain the same active ingredient, montelukast.

Take special care with Singulair
* If your asthma or breathing gets worse, tell your doctor immediately.
* Oral Singulair is not meant to treat acute asthma attacks. If an attack
occurs, follow the instructions your doctor has given you. Always have
your inhaled rescue medicine for asthma attacks with you.
* It is important that you or your child take all asthma medications
prescribed by your doctor. Singulair should not be substituted for other
asthma medications your doctor has prescribed for you.

If you take more Singulair than you should
Contact your doctor immediately for advice.
There were no side effects reported in the majority of overdose reports. The
most frequently occurring symptoms reported with overdose in adults and
children included abdominal pain, sleepiness, thirst, headache, vomiting, and

Ref: 1411/300316/1/B


Singulair 10mg film-coated tablets
(montelukast sodium)
Patient Information Leaflet (continued)
If you forget to take Singulair
Try to take Singulair as prescribed. However, if you miss a dose, just resume
the usual schedule of one tablet once daily.
Do not take a double dose to make up for a forgotten dose.
If you stop taking Singulair
Singulair can treat your asthma only if you continue to take it. It is important
to continue taking Singulair for as long as your doctor prescribes. It will help
control your asthma.
If you have any further questions on the use of this product, ask your doctor
or pharmacist.


Possible side effects

Like all medicines, Singulair can cause side effects, although not
everybody gets them.
In clinical studies with Singulair, the most commonly reported side effects
(occurring in at least 1 of 100 patients and less than 1 of 10 patients treated)
thought to be related to Singulair were:
* abdominal pain
* headache
These were usually mild and occurred at a greater frequency in patients
treated with Singulair than placebo (a pill containing no medication).
The frequency of possible side effects listed below is defined using the
following convention:
Very common (affects at least 1 user in 10)
Common (affects 1 to 10 users in 100)
Uncommon (affects 1 to 10 users in 1,000)
Rare (affects 1 to 10 users in 10,000)
Very rare (affects less than 1 user in 10,000)
Additionally, while the medicine has been on the market, the following have
been reported:
* upper respiratory infection (Very common)
* increased bleeding tendency (Rare)
* allergic reactions including swelling of the face, lips, tongue, and/or throat
which may cause difficulty in breathing or swallowing (Uncommon)
* behaviour and mood related changes [dream abnormalities, including
nightmares, trouble sleeping, sleep walking, irritability, feeling anxious,
restlessness, agitation including aggressive behaviour or hostility,
depression (Uncommon); tremor, disturbance in attention, memory
impairment (Rare); hallucinations, disorientation, suicidal thoughts and
actions (Very rare)]
* dizziness, drowsiness, pins and needles/numbness, seizure (Uncommon)
* palpitations (Rare)
* nosebleed (Uncommon), swelling (inflammation) of the lungs (Very rare)
* diarrhoea, nausea, vomiting (Common); dry mouth, indigestion
* hepatitis (inflammation of the liver) (Very rare)
* rash (Common); bruising, itching, hives (Uncommon); tender red lumps
under the skin most commonly on your shins (erythema nodosum),
severe skin reactions (erythema multiforme) that may occur without
warning (Very rare)
* joint or muscle pain, muscle cramps (Uncommon)
* fever (Common); weakness/tiredness, feeling unwell, swelling
In asthmatic patients treated with montelukast, very rare cases of a
combination of symptoms such as flu-like illness, pins and needles or
numbness of arms and legs, worsening of pulmonary symptoms and/or rash
(Churg-Strauss syndrome) have been reported. You must tell your doctor
right away if you get one or more of these symptoms.
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 (see details below). By reporting side effects you
can help provide more information on the safety of this medicine.
United Kingdom: Yellow Card Scheme at:


How to store Singular

Keep out of the sight and reach of children.
Do not store above 30°C.
Store in the original package in order to protect from light and moisture.
Do not use this medicine after the date shown by the six numbers following
EXP on the blister. The first two numbers indicate the month; the last four
numbers indicate the year. This medicine expires at the end of the month
If your medicine becomes discoloured or shows any signs of deterioration,
ask your pharmacist who will advise you what to do.
Medicines should not be disposed of via waterwaste or household waste.
Ask your pharmacist how to dispose of medicines no longer required. These
measures will help to protect the environment.


Further information

What Singular contains
Each film-coated tablet contains 10mg montelukast (as montelukast sodium).
The other ingredients are:
Microcrystalline cellulose, lactose monohydrate, croscarmellose sodium,
hydroxypropylcellulose, and magnesium stearate.
Film coating: hypromellose, hydroxypropylcellulose, titanium dioxide (E 171),
red ferric oxide (E 172), yellow ferric oxide (E 172) and carnauba wax.
What Singular looks like and the contents of the pack
Singulair tablets are beige, rounded square, film-coated with SINGULAIR
engraved on one side and MSD 117 on the other.
Blisters in packages of 28 tablets.
Manufacturer and Licence Holder
The tablets are manufactured by Merck Sharp & Dohme Ltd., Cramlington,
Northumberland NE23 3JU, UK and are procured from within the EU and
repackaged by the Product Licence Holder: Lexon (UK) Limited, Unit 18,
Oxleasow Road, East Moons Moat, Redditch, Worcestershire, B98 0RE.
Information is given by:
Asthma UK, Providence House, Providence Place, London N1 ONT.
Alternatively phone the Asthma UK Adviceline on 08457 010203, Monday to
Friday 9 am to 5 pm, calls charged at local rate.
(The Asthma UK is independent charity working to conquer asthma and is
not associated with Merck Sharp & Dohme Limited.)


PL 15184/1411

Singulair is a registered trademark of Merck Sharp & Dohme Corp.
Revision date: 30/03/16

Blind or partially sighted?
Is this leaflet hard to see or read?
Phone Lexon (UK) Limited,
Tel: +44 (0) 1527 505414 for help.

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Further information

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