Singulair is a leukotriene inhibitor used to treat asthma and certain allergies. The active ingredient in Singulair is montelukast sodium which is formulated as 10mg film-coated tablets, 4mg and 5mg chewable tablets, and 4mg packets of oral granules.

Drug Uses

Singulair is available by prescription only. Singular is used to prevent asthma attacks in adults and children over the age of one. It is also used to relieve symptoms of allergies, e.g. watery eyes, runny nose and sneezing. Singulair is used to prevent exercise-induced asthma and other conditions as determined by a doctor. Singulair should be administered to children under strict instructions of a doctor.


Always used Singulair as prescribed. Do not adjust the dose without your doctor's permission. To prevent asthma or allergy symptoms Singular is usually taken once daily in the evenings. To prevent exercise-induced asthma take a single dose about two hours before exercising.

Singulair tablets are to be swallowed whole with a glass of water. The chewable tablets should be properly chewed before swallowing. The oral granules should be placed in the mouth and swallowed with soft food. After opening a packet of oral granules, the contents should be used within 15 minutes. If left for later use, the granules will lose efficacy.

To administer Singulair to a baby, follow your doctor's instructions.

Swallow the regular tablet whole, with a glass of water.

The chewable tablet must be chewed completely before you swallow it.

Missed Dose

If a dose is missed, it can be taken as soon as you remember, as long as it does not clash with the next scheduled dose. In this case, rather skip the missed dose. Never take a double dose.


Do not take Singulair if you are allergic to montelukast.

Singular is used to prevent asthma. If an asthma attack has started, do not use Singulair rather use a fast-acting inhaler.

It may take several weeks of treatment with Singulair before you notice a decrease in asthma attacks.

Singulair is not expected to harm an unborn fetus. It is not known if Singulair passes into breast milk, therefore women who are breast-feeding should seek advice from a doctor before using Singulair.


Call for emergency medical assistance if any of the following allergic symptoms occur: difficulty in breathing, hives, or swelling of the lips, face, tongue or throat.

Contact your doctor if you have any of the following serious side effects: bruising, skin rash, numbness, pain, severe tingling, thoughts of suicide or hurting yourself, tremors, sinus pain, swelling, or severe asthma symptoms.

Less serious side-effects include stomach pain, headache, upset stomach, heartburn, diarrhea, nausea, dental pain, fatigue, blocked nose, sore throat, hoarseness, cough, or mild rash.

This is not a complete list of side effects. If any other uncomfortable symptoms occur and persist, contact your doctor.


If overdose with Singulair is suspected, get emergency assistance immediately. There are no known symptoms of overdose.


Singulair should be kept in a cool, dry place away from sun and moisture.