Singulair is a leukotriene (loo-koe-TRY-een) inhibitor. Leukotrienes are chemicals your body releases when you breathe in an allergen (such as pollen). These chemicals cause swelling in your lungs and tightening of the muscles around your airways, which can result in asthma symptoms.rnSingulair is used to prevent asthma attacks in adults and children as young as 12 months old. It is also used to relieve runny nose and sneezing caused by allergies in adults and children as young as 6 months old.rnDo not give Singulair to a child without a doctor`s advice.rnSingulair is also used to prevent exercise-induced bronchoconstriction (narrowing of the air passages in the lungs) in adults and teenagers who are at least 15 years old and are not already taking this medicine for other conditions.rnIf you already take Singulair to prevent asthma or allergy symptoms, do not use an extra dose to treat exercise-induced bronchoconstriction.

The health and medical information provided here is for general purposes only and is not a substitute for the expertise and judgment of your physician, or other health care professional. It should not be understood to indicate that the use of this medicine is safe, appropriate or effective for you. Always consult your health care professional before using this, or any other, drug.

Singulair will not work fast enough to treat an asthma attack that has already begun. Use only a fast-acting inhalation medicine to treat an asthma attack. Talk with your doctor if any of your asthma medications do not seem to work as well in treating or preventing attacks.rnIt may take up to several weeks before your symptoms improve. Keep using the medication as directed and tell your doctor if your symptoms do not improve after several weeks of treatment. rnCall your doctor right away if you feel that this medicine is not working as well as usual, or if it makes your condition worse. If it seems like you need to use more of any of your medications in a 24-hour period, talk with your doctor.rnIf you already take Singulair to prevent asthma or allergy symptoms, do not use it for exercise-induced bronchoconstriction.rnCall your doctor at once if you have any mood or behavior changes, anxiety, depression, or thoughts about suicide or hurting yourself

Get emergency medical help if you have any of these signs of an allergic reaction to Singulair: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:rnskin rash, bruising, severe tingling, numbness, pain, muscle weakness;rnmood or behavior changes, anxiety, depression, or thoughts about suicide or hurting yourself;rntremors or shaking;rnsevere sinus pain, swelling, or irritation; orrnworsening asthma symptoms.rnLess serious Singulair side effects may include:rnheadache;rnstomach pain, heartburn, upset stomach, nausea, diarrhea;rntooth pain;rntired feeling;rnfever, stuffy nose, sore throat, cough, hoarseness; orrnmild rash.

Take Singulair exactly as prescribed by your doctor. Do not take in larger or smaller amounts or for longer than recommended. Follow the directions on your prescription label.rnSingulair is usually taken once daily in the evening for prevention of asthma or allergy symptoms. For exercise-induced bronchoconstriction, take a single dose at least 2 hours before you exercise, and do not take another dose for at least 24 hours. Follow your doctor`s instructions.rnIf you already take Singulair to prevent asthma or allergy symptoms, do not use it for exercise-induced bronchoconstriction.rnSwallow the regular tablet whole, with a glass of water.rnThe chewable tablet must be chewed completely before you swallow it.rnThe oral granules can be placed directly into the mouth and swallowed, or mixed with a spoonful of applesauce, mashed carrots, rice, or ice cream. Oral granules can also be mixed with 1 teaspoon of baby formula or breast milk. Do not use any other type of liquid for mixing the granules. Other liquids can be taken before or after taking the medicine.rnAfter opening or mixing the oral granules, you must use them within 15 minutes. Do not save an open packet or mixed medicine for later use.rnSingulair will not work fast enough to treat an asthma attack that has already begun. Use only a fast-acting inhalation medicine to treat an asthma attack. Talk with your doctor if any of your asthma medications do not seem to work as well in treating or preventing attacks.rnIt may take up to several weeks before your symptoms improve. Keep using Singulair as directed and tell your doctor if your symptoms do not improve after several weeks of treatment.rnAsthma is usually treated with a combination of drugs. Use all medications as directed by your doctor. Read the medication guide or patient instructions provided with each medication. Do not change your doses or medication schedulewithout your doctor`s advice, even if you have no asthma symptoms.rnIf you also take a steroid asthma medicine, do not stop using it suddenly without first talking to your doctor. You may need to use less and less before you stop the medication completely.rnCall your doctor right away if you feel that this medicine is not working as well as usual, or if it makes your condition worse. If it seems like you need to use more of any of your medications in a 24-hour period, talk with your doctor.