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Prescribed to help prevent asthma symptoms and attacks, Singulair tablets are manufactured in the UK by Merck Sharp & Dohme and contain the active ingredient montelukast.

We do not provide this treatment online. Speak to your GP in person to be prescribed this item.


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PLEASE NOTE: This treatment is not available through our online pharmacy service. This page is for information only. If you are experiencing any of the symptoms related to the condition(s) this medication treats, we strongly recommend that you see your GP in person.

This content was reviewed by a clinician on

27 August 2020
dr daniel

Dr Daniel Atkinson

(GP Clinical Lead - GMC No. 4624794) 27 August 2020
Product information

Singulair tablets, from Merck Sharp & Dohme, is a medicine referred to as a leukotriene receptor antagonist. They inhibit the function of the natural substance leukotriene in the lungs, which can cause the symptoms of asthma. You can now buy Singulair online from our pharmacy, which is based in the United Kingdom.

  1. Widely prescribed asthma treatment
  2. One tablet to be taken daily
  3. For use alongside other asthma medication

An extremely common, chronic illness, the respiratory condition asthma is a part of everyday life for millions of British people. It is characterised by coughing, wheezing when breathing and tightness in the chest, and when these symptoms considerably worsen it is usually described as an asthma attack, medically known as an acute asthma exacerbation. The attacks normally develop over a number of days, but can be more sudden; in severe cases these attacks require immediate medical attention.

Asthma causes an inflammation of the tubes that carry the air both ways through the lungs (bronchi). When they are agitated by an outside trigger, these tubes become narrower and the muscles around them constrict. More phlegm is also produced, and these factors all contribute to the symptoms we associate with the condition.

The triggers for asthma take a myriad of forms, and can range from irritants which commonly cause an allergic reaction, such as dust, pet hair or pollen, to certain types of medicines, colds or flu, exercise or even a change in the weather. Although what exactly causes asthma is unclear, factors that can make you more prone include smoking or being exposed to secondhand smoke, being overweight, having a family history of the disease or allergies, or working with in an environment with certain substances in the air.

When managed properly with the right medication and regular check ups, asthma normally should not have too dramatic an effect on day to day life. For some, preventer medicines such as Singulair are a major method of treatment and should be taken daily, even when feeling well, to minimise the effects of possible exposure to various triggers.

Singulair contains the active ingredient montelukast, and is taken at the same time as another preventer. It blocks the lungs from responding to leukotrienes, which are manufactured by the body as a response to certain stimulus, in this case the triggers which can cause asthma. This stops the bronchi in the lungs from becoming inflamed and generating mucus.

Singulair is also used to treat hay fever in people with asthma, as leukotrienes are also generated in the nasal passages when they come into contact with pollen. Additionally, it is prescribed to treat asthma which can be induced by exercise narrowing the airways.

Please note that we do not offer this treatment on our site. To be prescribed this medication, you should see your GP in person.

Page last reviewed:  27/08/2020


Be sure to take this medicine as directed by your prescriber, remembering any special instructions you may have been given. This will enable your treatment to be as effective as possible and reduce the chances of side effects.

  1. Use this item as prescribed.
  2. Take one tablet each day in the evening, with or without food.
  3. Take your tablet even when you feel well and have no symptoms.
  4. You should continue to take your other asthma medications as prescribed by your doctor.
  5. This item is not suitable for treating acute asthma attacks on demand; always make sure you have your reliever inhaler with you.
  6. If you forget to take a tablet, resume the course the following day as before.
  7. Do not take extra tablets to compensate for missed doses.
  8. If you take more Singulair than you should, consult your doctor immediately.
  9. See your doctor before you stop taking this medication.

These directions are only a summary of those you will need to follow. Please read the patient information leaflet for a full set of instructions before taking this medicine.

Page last reviewed:  27/08/2020
Please read the patient information leaflet for this medicine fully before use:

Singulair 10mg

Side effects & Warnings

Side Effects

Like all other medicines, Singulair can cause side effects, though not everyone will necessarily experience them. You should seek immediate medical assistance if your breathing or asthma worsens, or have a combination of one or more of the signs of a rare condition called Churg-Strauss syndrome, which include flu like symptoms, tingling or numbness in the limbs, rashes and difficulty breathing.

Very common (1 in 10 people or more):

Infections of the upper respiratory tract.

Common (1 in 10 people or less):

Headaches, diarrhoea, abdominal pain, vomiting or feeling sick, fever, or rashes.

Uncommon (1 in 100 people or less):

Allergic reaction which includes swelling of the lips, face, lips or tongue leading to problems swallowing or breathing difficulties, feeling dizzy, tingling sensations, seizures, nosebleeds, itchy rashes or hives, pain in the joints or muscles, drowsiness, sleeplessness, sleepwalking, anxiety, depression, or aggressive behaviour.

Rare (1 in 1,000 people or less):

Forgetfulness, difficulty concentrating, heart palpitations, susceptibility to increased bleeding.

Very Rare (1 in 10,000 people or less):

Swelling of the lungs, severe skin rash, hepatitis, suicidal feelings, hallucinations.

This list of side effects is not exhaustive. Consult the patient information list supplied with this medicine for more.

Taking it with other medicines

There are some medicines that can hamper the effectiveness of this treatment or increase the possibility of side effects, including: epilepsy medications phenobarbital and phenytoin; the antibiotic rifampicin; and gemfibrozil, which is used to reduce blood fats and cholesterol.

When you are completing your online medical survey, please remember to disclose details of all of the other medicines you are currently taking, whether you have a prescription for them or not. You should not take Singulair at the same time as another medicine with the same active ingredient of montelukast.

Conditions to look out for

Do not use this medicine if you are allergic to the active ingredient montelukast or any of the excipient (additional) ingredients; also, speak to your doctor if you are lactose intolerant, as the tablets contain lactose.

Pregnancy and breastfeeding

Consult with your doctor before using Singulair if you are pregnant, planning on becoming pregnant, or breastfeeding.

Driving and using machinery

If your vision or concentration becomes impaired due to side effects such as dizziness or drowsiness, do not drive or use machines.

Lactose intolerance

This medication contains lactose. Tell your prescribing physician if you have an intolerance to any sugars.

Page last reviewed:  27/08/2020
Please read the patient information leaflet for this medicine fully before use:

Singulair 10mg


Can I still drink alcohol?

Singulair is not thought to be affected by alcohol, but if you find that drinking alcohol triggers your asthma, you should avoid it.

Will I still be able to drive?

If you experience side effects that make you feel dizzy or sleepy then you must refrain from driving.

Can I take the medicine while pregnant?

It is not yet known how safe Singulair is when taken during pregnancy. Consult your doctor about using this item if you are pregnant, breastfeeding or are considering having a baby.

How should I store it?

Keep this medication at room temperature and out of the reach of children. Use only until the expiry date, after which you should dispose of it responsibly by giving it to a pharmacist to throw away.

Am I allergic to anything in the medicine?

The active substance is montelukast, and the other ingredients are lactose monohydrate, microcrystalline cellulose, hyprolose, croscarmellose sodium, and magnesium stearate.

The film coating of the tablets contain hyprolose, titanium dioxide, hypromellose, ferric oxide (red and yellow), and carnauba wax. Speak to your doctor first if you are allergic to any of these ingredients.

Is it available over-the-counter?

You need a prescription to buy Singulair. This is so that a doctor can ensure it is safe for you to use.

Is it right for me?

Talk to your respiratory nurse or your regular doctor in person. They will decide which treatment is the best option for you following a review of your symptoms and, where necessary, issue a prescription.

If you are looking to renew your prescription for Singulair, we recommend contacting your GP surgery.

Page last reviewed:  27/08/2020 is rated 4.9 out of 5 by 3256 customers on TrustPilot!
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