Generic Singulair is a leukotriene 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.
Generic Singulair is used to prevent asthma attacks in adults and children as young as 12 months old. Generic Singulair is also used to prevent exercise-induced bronchospasm in adults and children who are at least 6 years old.
Generic Singulair is also used to treat symptoms of year-round (perennial) allergies in adults and children who are at least 6 months old. It is also used to treat symptoms of seasonal allergies in adults and children who are at least 2 years old.
Take Generic 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.
Generic Singulair 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.
If you already take Singulair to prevent asthma or allergy symptoms, do not use it for exercise-induced bronchoconstriction.
Swallow the regular tablet whole, with a glass of water.
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 a serious side effect such as:
- skin rash, bruising, severe tingling, numbness, pain, muscle weakness;
- mood or behavior changes, anxiety, depression, or thoughts about suicide or hurting yourself;
- tremors or shaking;
- easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin;
- severe sinus pain, swelling, or irritation;
- worsening asthma symptoms; or
- severe skin reaction - fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.
Less serious Singulair side effects may include:
- stomach pain, heartburn, upset stomach, nausea, diarrhea;
- tooth pain;
- tired feeling;
- fever, stuffy nose, sore throat, cough, hoarseness; or
- mild rash.
This is not a complete list of side effects and others may occur.
Avoid situations or activities that may trigger an asthma attack.
If your asthma symptoms get worse when you take aspirin, avoid taking aspirin or other NSAIDs (non-steroidal anti-inflammatory drugs) while you are taking montelukast.
Before using Generic Singulair, tell your doctor about all other medicines you use, especially:
- phenobarbital (Luminal, Solfoton); or
- rifampin (Rifadin, Rifater, Rifamate, Rimactane).
This list is not complete and there may be other drugs that can interact with Generic Singulair.
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
Store at 77 degrees F (25 degrees C). Brief storage at temperatures between 59 and 86 degrees F (15 and 30 degrees C) is permitted. Store away from heat, moisture, and light. Do not store in the bathroom. Keep Montelukast out of the reach of children and away from pets.