• 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 or your child only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours or your child’s.
• If you or your child 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 taking 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. By blocking leukotrienes, Montelukast improves asthma symptoms and helps control asthma.

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

• Montelukast is used for the treatment of paediatric patients 6 to 14 years of age who are not adequately controlled on their medication and need additional therapy.
• Montelukast may also be used as an alternative treatment to inhaled corticosteroids for 6 to 14 year old patients who have not recently taken oral corticosteroids for their asthma and have shown that they are unable to use inhaled corticosteroids.
• Montelukast also helps prevent the narrowing of airways triggered by exercise for patients.

Your doctor will determine how Montelukast should be used depending on the symptoms and severity of you or your child's 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.

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

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

Talk to your doctor or pharmacist before you or your child take Montelukast

• If you or your child’s 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 or your child. 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 used instead of other asthma medications your doctor has prescribed for you or your child.
• Any patient on anti-asthma medicines, should be aware that if you develop a combination of symptoms such as 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 or your child 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 6 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 or your child 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 or your child is taking the following medicines before starting Montelukast:

• phenobarbital (used for treatment of epilepsy)
• phenytoin (used for treatment of epilepsy)
• rifampicin (used to treat tuberculosis and some other infections).

Montelukast should not be taken immediately with food; they should be taken at least 1 hour before or 2 hours after food.

If you are pregnant or breast-feeding, think you may be pregnant or 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.

If you or your child has phenylketonuria (a rare, hereditary disorder of the metabolism) you should take into account that each Montelukast chewable tablet contains phenylalanine (equivalent to 0.842 mg phenylalanine per 5 mg chewable tablet).

The recommended dose is one Montelukast chewable tablet daily to be taken in the evening.

If you or your child is taking Montelukast 5 mg chewable tablets, be sure that you or your child does not take any other products that contain the same active ingredient, montelukast.

This medicine is for oral use.

The tablets are to be chewed before swallowing.

Montelukast should not be taken immediately with food; it should be taken at least 1 hour before or 2 hours after 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 or your child misses a dose, just resume the usual schedule of one chewable tablet once daily.

Do not take a double dose to make up for a forgotten dose.

Montelukast can treat you or your child’s asthma only if you or your child continues to take it.

It is important to continue taking Montelukast for as long as your doctor prescribes. It will help control you or your child’s 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 or your child 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 chewable tablet contains montelukast sodium which corresponds to 5 mg of montelukast.

The other ingredients are: mannitol (E 421), hydroxypropylcellulose (E 463), croscarmellose sodium (E 468), iron oxide, red (E 172), cherry flavour (contains modified food starch), aspartame (E 951), cellulose, microcrystalline (E 460), magnesium stearate (E 572).

Light pink to pink coloured, speckled, oval shaped, biconvex tablets debossed with ‘MTS’ on one side and ‘5’ on the other side.

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