• 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 only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
• If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.

1. What Montelukast is and what it is used for
2. What you need to know before you take Montelukast
3. How to take Montelukast
4. Possible side effects
5. How to store Montelukast
6. Contents of the pack and other information

Montelukast 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, montelukast improves asthma symptoms, helps control asthma and improves seasonal allergy symptoms (also known as hay fever or seasonal allergic rhinitis).

Your doctor has prescribed Montelukast to treat asthma, preventing your asthma symptoms during the day and night.

• Montelukast is used for the treatment of adults and adolescents 15 years of age and older who are not adequately controlled on their medication and need additional therapy.
• Montelukast also helps prevent the narrowing of airways triggered by exercise.
• In those asthmatic patients in whom Montelukast is indicated in asthma, Montelukast can also provide symptomatic relief of seasonal allergic rhinitis.

Your doctor will determine how Montelukast should be used depending on the symptoms and severity of your 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 airways.

Symptoms of asthma include: Coughing, wheezing, and chest tightness.

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.

• if you are allergic to montelukast or any of the other ingredients of this medicine (listed in section 6).

Talk to your doctor or pharmacist before taking Montelukast

• If your asthma or breathing gets worse, tell your doctor immediately.
• Oral montelukast 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. Montelukast should not be substituted for other asthma medications your doctor has prescribed for you.
• 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.

Various neuropsychiatric events (for example behaviour and mood-related changes, depression and suicidality) have been reported in patients of all ages treated with montelukast (see section 4). If you develop such symptoms while taking montelukast, you should contact your doctor.

Do not give this medicine to children less than 15 years of age.

There are different form(s) of this medicine available for paediatric patients under 18 years of age based on age range.

Tell your doctor or pharmacist if you are taking or have recently taken or might take any other medicines, including those obtained without a prescription.

Some medicines may affect how montelukast works, or montelukast may affect how other medicines work.

Tell your doctor if you are taking the following medicines before starting this medicine:

• 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)

Montelukast may be taken with or without food.

If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking Montelukast.

Pregnancy

Your doctor will assess whether you can take Montelukast during this time.

Breast-feeding

It is not known if montelukast appears in breast milk. You should consult your doctor before taking Montelukast if you are breast-feeding or intend to breast-feed.

Montelukast 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 with montelukast may affect some patients’ ability to drive or operate machinery.

Montelukast contains the milk sugar 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.

The recommended dose is one 10 mg tablet to be taken daily in the evening.

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

This medicine is for oral use.

You can take Montelukast with or without food.

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 hyperactivity.

Try to take Montelukast 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.

Montelukast can treat your asthma only if you continue to take it.

It is important to continue taking Montelukast for as long as your doctor prescribes. It will help control your asthma.

Talk with your doctor immediately if you notice any of the following side effects, which may be serious, and for which you may need urgent medical treatment.

Uncommon: the following may affect up to 1 in 100 people

• allergic reactions including swelling of the face, lips, tongue, and/or throat which may cause difficulty in breathing or swallowing
• behaviour and mood related changes: agitation including aggressive behaviour or hostility, depression
• seizure

Rare: the following may affect up to 1 in 1,000 people

• increased bleeding tendency
• tremor
• palpitations

Very rare: the following may affect up to 1 in 10,000 people

• 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) (see section 2)
• low blood platelet count
• behaviour and mood related changes: hallucinations, disorientation, suicidal thoughts and actions
• swelling (inflammation) of the lungs
• severe skin reactions (erythema multiforme) that may occur without warning
• inflammation of the liver (hepatitis)

Very common: the following may affect more than 1 in 10 people

• upper respiratory infection

Common: the following may affect up to 1 in 10 people

• diarrhoea, nausea, vomiting
• rash
• fever
• elevated liver enzymes

Uncommon: the following may affect up to 1 in 100 people

• behaviour and mood related changes: dream abnormalities, including nightmares, trouble sleeping, sleepwalking, irritability, feeling anxious, restlessness
• dizziness, drowsiness, pins and needles/numbness
• nosebleed
• dry mouth, indigestion
• bruising, itching, hives
• joint or muscle pain, muscle cramps
• bedwetting in children
• weakness/tiredness, feeling unwell, swelling

Rare: the following may affect up to 1 in 1,000 people

• behaviour and mood related changes: disturbance in attention, memory impairment, uncontrolled muscle movements

Very rare: the following may affect up to 1 in 10,000 people

• tender red lumps under the skin, most commonly on your shins (erythema nodosum)
• behaviour and mood related changes: obsessive-compulsive symptoms, stuttering

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 website www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.

The active substance is montelukast. Each tablet contains montelukast sodium which corresponds to 10 mg of montelukast.

The other ingredients are:

Tablet Core: lactose monohydrate, cellulose, microcrystalline (E460), croscarmellose sodium (E468), hydroxypropylcellulose (E463), magnesium stearate (E572).

Film-coating: hypromellose (E 464), titanium dioxide (E171), macrogol 400, iron oxide yellow (E172), iron oxide red (E172), iron oxide black (E172).

Brown coloured rounded square shaped, film coated tablets debossed with ‘MTS’ on one side and ‘10’ on the other side.

Blister in pack sizes of: 14, 20, 28, 49, 50, 100 film-coated tablets. Not all pack sizes may be marketed.