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General information about Singulair (montelukast) for use in Ireland. It is not a substitute for professional medical advice; always discuss with your doctor or pharmacist for personalised guidance.

What Singulair is used for

Singulair is a medicine that helps prevent asthma symptoms and some allergy symptoms. It works by blocking substances in the body that can cause airway inflammation and nasal symptoms.

In Ireland, Singulair may be prescribed by a clinician depending on local rules. Your pharmacist can explain how Singulair is supplied and how it should be used.

Singulair comes in different forms and strengths for adults and children. It is intended as a daily preventive treatment rather than a medicine for immediate relief of sudden symptoms. Your healthcare professional will guide you on the form and the appropriate use for your situation.

As part of a broader treatment plan, Singulair may be used alongside other medicines such as inhaled therapies or nasal sprays. Always follow the treatment plan prescribed by your clinician and do not change medicines on your own without medical advice.

If you have questions about why Singulair has been prescribed for you, or how it fits with other medicines you use, speak with your doctor or pharmacist for clarification.

What Singulair is used to treat

Singulair is commonly used to prevent asthma symptoms such as wheeze, chest tightness, and coughing. It can also help reduce nasal symptoms such as sneezing, runny nose, and itchy eyes caused by seasonal allergies.

For some people, Singulair may lower the need for other asthma medicines or help control symptoms more consistently. It is normally taken every day to maintain control over a condition, rather than to treat a sudden flare.

Your clinician will decide how Singulair fits with your overall plan for asthma or allergic rhinitis. They may adjust other aspects of your treatment based on how you respond to Singulair and any side effects you experience.

If you notice your symptoms change or you have concerns about how Singulair is helping you, contact your healthcare professional for advice. Do not change your treatment plan without medical input.

How Singulair works

Montelukast, the active ingredient in Singulair, blocks leukotrienes—substances in the body that can cause airway inflammation and nasal symptoms during asthma and allergies. By reducing these inflammatory effects, Singulair helps prevent symptoms from occurring.

The medication is designed as a controller therapy, meaning it is used regularly to maintain symptom control. It is not intended for immediate relief of an asthma attack or a sudden allergic flare.

Singulair may be used alone or in combination with other asthma controllers or allergy medicines, depending on the individual’s condition. Your clinician will explain how it should be integrated into your treatment plan and how to monitor effectiveness and safety.

Effects on symptoms take time to develop in many people. If you have questions about what you can expect with Singulair, discuss them with your doctor or pharmacist. They can provide guidance based on your health status and needs.

How to use Singulair

Use Singulair exactly as prescribed by your clinician. Do not change the dose or frequency without medical advice. If you are unsure about how you should take Singulair, ask your pharmacist for guidance.

The medicine is usually taken once daily. You may take it with or without food, according to the directions given by your clinician. If you have a child who is taking Singulair, ensure the product form matches their age and weight as advised by the prescriber.

Tablets should be swallowed with water. Chewable tablets must be chewed before swallowing. Do not crush or chew a tablet that is not meant to be chewed, unless your clinician has advised otherwise. If you have trouble swallowing, talk to your pharmacist about alternative forms or ways to take the medicine.

If you miss a dose, take it as soon as you remember unless it is close to the time of your next dose. Do not double up to make up for a missed dose. If you are unsure what to do, contact your pharmacist or clinician for guidance.

Who should avoid Singulair

Do not take Singulair if you have a known allergy to montelukast or any ingredients in the product. An allergic reaction can be serious and requires medical attention.

Tell your doctor if you have significant liver problems or a history of liver disease. Your clinician will decide whether Singulair is appropriate and how it should be dosed for you.

If you are pregnant or breastfeeding, discuss Singulair with your clinician before starting treatment. The decision will depend on your circumstances and the possible benefits for you and your baby.

Singulair is prescribed for specific age groups. If you are considering treatment for a child, the clinician will determine whether Singulair is suitable for that child and which form to use. If a child experiences behavioural or mood changes, speak with a healthcare professional promptly.

If you have a mental health condition or a history of mood changes, tell your doctor. They will assess whether Singulair is appropriate and monitor for potential effects.

Warnings

Seek urgent medical help if you experience signs of a severe allergic reaction, such as swelling of the face or throat, severe rash, or difficulty breathing. These symptoms require prompt medical evaluation.

Montelukast has been linked with neuropsychiatric events in rare cases. If you notice significant mood changes, sleep disturbances, agitation, aggression, or thoughts of harming yourself or others, contact a healthcare professional promptly and seek medical advice.

In rare instances, Singulair can affect the liver. Be alert to symptoms such as yellowing of the skin or eyes, dark urine, persistent abdominal pain, or unusual fatigue. If you notice any of these, discuss them with your clinician right away.

Do not take Singulair if you are advised not to on medical grounds. If you are starting another medicine or a supplement, inform your clinician as some medicines can interact with Singulair or affect its safety profile.

If you are pregnant, planning a pregnancy, or breastfeeding, discuss the risks and benefits with your clinician. The decision is based on your health needs and the potential benefit to your baby.

Side effects

Like all medicines, Singulair can cause side effects in some people. The most common ones are usually mild and disappear with time.

Possible common side effects include headaches, stomach upset, or a runny nose. Some people may experience sore throat or fever during treatment.

Less common effects may include fatigue, upper respiratory infections, or rash. If you notice any skin changes, severe swelling, or difficult symptoms, contact your clinician.

In rare cases, changes in mood, sleep problems, or behavior have been reported. If you have concerns about mood or behavior, talk with your doctor. Seek urgent medical help if you have thoughts of harming yourself or others or if symptoms worsen suddenly.

Interactions

Always tell your doctor and pharmacist about all medicines you take, including over-the-counter products, vitamins, and herbal supplements. Some medicines can affect how Singulair works or increase the risk of side effects.

Do not start or stop any other medicines without first discussing them with a healthcare professional. This includes medicines you buy without a prescription, as well as other asthma or allergy medicines you may be using.

If you are prescribed Singulair and you start a new medicine, check with your clinician about possible interactions. They can help determine the safest plan for you.

Keep a current list of all medicines you use and share it with every healthcare professional involved in your care. This helps prevent potential interactions and ensures coordinated treatment.

Pregnancy and breastfeeding

Singulair should only be used during pregnancy if clearly needed and after discussion with your clinician. The potential benefits for you should be weighed against any possible risk to the baby.

If you are planning a pregnancy or become pregnant while taking Singulair, tell your doctor as soon as possible. They may adjust treatment or suggest alternatives.

Breastfeeding while taking Singulair should be discussed with your clinician. Your doctor can advise on the best approach for you and your baby.

Always follow the guidance given by your healthcare professional. If you have questions about pregnancy or breastfeeding while using Singulair, contact your clinician for personalised advice.

FAQ

How long does Singulair take to work for symptoms?

Singulair is generally used as a daily preventive medicine. It may take several days to weeks to see noticeable improvements in symptoms. If you have asthma or allergy symptoms that worsen, talk to your clinician for a review of your treatment plan. If you have an acute attack, seek urgent medical help.

What should I do if I miss a dose?

Take the missed dose as soon as you remember, unless it is near the time of your next dose. Do not double up to make up for a missed dose. If you are unsure what to do, contact your pharmacist or clinician for guidance.

Can I take Singulair with other allergy or asthma medicines?

Singulair is often used alongside other medicines. Do not change your other treatments without consulting your clinician. They can advise how best to combine therapies and when to take each medicine.

Is Singulair safe for children?

Singulair is prescribed for children after medical evaluation. The available product forms and doses depend on age. If you notice changes in mood or behaviour in a child taking Singulair, contact a healthcare professional promptly.

Should I stop taking Singulair if I feel better?

Long-term preventive medicines are often continued even if symptoms improve. Do not stop taking Singulair without discussing with your doctor, unless the leaflet or clinician instructs otherwise. Stopping suddenly may cause symptoms to return.

Can Singulair be used during pregnancy or breastfeeding?

Discuss pregnancy or breastfeeding with your doctor before starting Singulair. The decision depends on your situation and the expected benefits for you and your baby. If you become pregnant while taking Singulair, tell your doctor right away.

Can Singulair cause mood changes or sleep problems?

Some people may experience mood changes, sleep disturbances, or behavioural changes. If you notice such symptoms, talk with your clinician. Seek medical help if mood changes are severe or persistent or if there are thoughts of harming yourself or others.

What should I do if I have a severe skin reaction?

Severe skin reactions are uncommon but require urgent medical attention. If you develop a widespread rash, blistering skin, or peeling, contact a healthcare professional promptly or seek urgent care.

Does Singulair interact with other medicines?

Always tell your doctor or pharmacist about all medicines you take, including over-the-counter products and herbal supplements. Some medicines can affect how Singulair works or increase side effects. Do not start new medicines without checking with a clinician.

How long will I need to take Singulair?

The duration of treatment depends on the reason for use and how you respond. Singulair is often taken long-term under medical supervision. If you have concerns about how long you should take it, discuss them with your doctor.

Can I take Singulair if I have a fever or an infection?

Most people can continue Singulair alongside treatment for infections, but an illness may affect how you feel or how you respond to treatment. If you have a high fever, persistent symptoms, or feel unwell, speak to your clinician for advice specific to you.

Is Singulair a steroid?

No. Singulair (montelukast) is not a steroid. It belongs to a class called leukotriene receptor antagonists and works in a different way from inhaled or oral steroids. If you have questions about how it compares with other medicines, ask your clinician.

Sources

This information reflects general guidance and the common aspects found in official patient information for Singulair (montelukast). Always refer to the product leaflet provided with your medicine for the exact instructions and safety information.

If you are in Ireland, your pharmacist or clinician can confirm local rules about prescription requirements and product availability. For any questions about dosing, duration, or changes to your treatment, consult your doctor or pharmacist.

Important safety information comes from standard medical references and the patient information leaflets supplied with Singulair products. If you notice new symptoms, or if existing symptoms change, contact your healthcare professional promptly.