Montelukast (Oral) (Singulair) - Drugs Information, Side Effects, & Interactions

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Montelukast (mon-te-LOO-kast)

Helps prevent and control asthma attacks.

Singulair
There may be other brand names for this medicine.

You should not use this medicine if you have had an allergic reaction to montelukast.

Tablet, Chewable Tablet, Packet

Your doctor will tell you how much of this medicine to take and how often. Do not take more medicine or take it more often than your doctor tells you to.
This medicine comes with patient instructions. Read and follow these instructions carefully. Ask your doctor or pharmacist if you have any questions.
You may take this medicine with or without food. Take the medicine at the same time every evening unless your doctor tells you otherwise.
Swallow the tablet whole. Do not break, crush, or chew it. The chewable tablet must be chewed before you swallow it.
Do not open the packet of oral granules until you are ready to use it. You can give the oral granules to a child in two different ways. Choose one way that works best for your child.
- You can put the oral granules directly on a spoon, then into the child's mouth.
- or you can mix the oral granules with applesauce, mashed carrots, rice, or ice cream. The food should be cold or room temperature. Do not mix the medicine with a liquid drink. Use the mixed medicine right away. Do not save any mixed medicine to use later.

If a dose is missed:

If you miss a dose or forget to take your medicine, take it as soon as you can. If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose.
Do not use extra medicine to make up for a missed dose.

Store the medicine at room temperature away from heat, moisture, and direct light.
Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
Keep all medicine out of the reach of children and never share your medicine with anyone.

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

Make sure your doctor knows if you are pregnant or breast feeding, or if you have liver disease or are allergic to aspirin.
This medicine will not stop an asthma attack that has already started. Your doctor may prescribe another medicine for you to use in case of an acute asthma attack.
If you use any type of corticosteroid medicine to control your asthma, keep using it as ordered by your doctor. This includes corticosteroid medicines that are taken by mouth or inhaled (such as cortisone, prednisone, Azmacort®, Celestone®, Cortone®, Deltasone®, Flovent®, Prelone® Pediapred®, Vanceril®).
If any of your asthma medicines do not seem to be working as well as usual, call your doctor right away. Do not change your doses or stop using your medicines without asking your doctor.
This medicine may make you dizzy or drowsy. Avoid driving, using machines, or doing anything else that could be dangerous if you are not alert.
The chewable tablet contains phenylalanine. Tell your doctor if you have PKU (phenylketonuria) before taking the chewable tablet.

Call your doctor right away if you notice any of these side effects:

Allergic reaction: Itching or hives, swelling in face or hands, swelling or tingling in the mouth or throat, tightness in chest, trouble breathing
Fast, slow, or irregular heartbeat
Numbness or tingling in the hands, arms, legs, or feet

If you notice these less serious side effects, talk with your doctor:

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