Singulair is a known leukotriene (chemicals released by body when an allergen is inhaled) inhibitor. Leukotrienes can cause swelling in lungs and tightening of muscles around your airways that can eventually result in asthma.

Singulair is mainly used for long-term prevention of asthma in adults as well as children (as young as 1 year old). It may also be used to ease runny nose and sneezing caused by allergies in kids (as young as 6 months) and adults.

Singulair is also used to prevent narrowing of the air passages in the lungs (known as bronchoconstriction) caused by exercise. However, Singulair can’t be used for exercise-induced bronchoconstriction if the patient has already taken Singulair to prevent asthma.

Side Effects

Singulair can cause severe as well as less serious side effects. Some of them are:

• Skin Rash
• Muscle weakness
• Numbness
• Severe sinus pain
• Swelling of face, lips, tongue, or throat
• Worsening Asthma symptoms
• Abdominal pain
• Nausea
• Diarrhea
• Upset stomach
• Mouth pain
• Fatigue
• Stuffy nose
• Fever and headache
• Faintness

A possible link between Singular and suicidal tendencies is being investigated by FDA.

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