Montelukast comes as a tablet and as a chewable tablet to take by mouth. It is usually taken once a day in the evening. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take montelukast exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Montelukast controls asthma but does not cure it. Continue to take montelukast even if you feel well. Do not stop taking montelukast without talking to your doctor

Although side effects from montelukast are not common, they can occur. Tell your doctor if any of these symptoms are severe or do not go away:

headache
dizziness
heartburn
upset stomach
tiredness
stomach pain
tooth pain
stuffy nose
cough
If you experience either of the following symptoms, call your doctor immediately:

increased difficulty breathing
severe rash
fever
flu-like symptoms

In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.