Singulair (Montelukast)

Singulair is used for prevention and long-term treatment of asthma. It is also used in certain patients to relieve runny nose caused by allergy and to prevent asthma attacks caused by exercise. It may also be used for other conditions as determined by your doctor.

Singulair is a leukotriene receptor antagonist. It works by blocking a substance called leukotriene, which helps to decrease certain asthma and allergy symptoms.

Some medical conditions may interact with Singulair . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have liver problems
• if you have a history of mental or mood problems, or suicidal thoughts or actions

• Certain anticonvulsants (eg, phenobarbital) or rifampin because they may decrease Singulair 's effectiveness

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

• Cough; dizziness; headache; indigestion; nausea; stomach upset or pain; stuffy nose; tiredness; trouble sleeping; weakness.

• Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); aggressive behavior; agitation; dark urine; fever; flu-like symptoms; hallucinations; irregular heartbeat; mental or mood changes; new or worsening wheezing or other breathing problems; numbness or tingling of hands or feet; seizures; severe or persistent stomach pain; severe sinus inflammation; suicidal thoughts or actions; swelling; unusual bruising or bleeding; upper respiratory tract infection; yellowing of the skin or eyes.

If you have any questions about Singulair , please talk with your doctor, pharmacist, or other health care provider.
Singulair is to be used only by the patient for whom it is prescribed. Do not share it with other people.
If your symptoms do not improve or if they become worse, check with your doctor.