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Singulair is a brand name for a drug with an active ingredient called Montelukast. This substance is often prescribed by doctors to patients who are suffering from asthma and allergies. It relieves their symptoms, including nasal congestion, itching, and sneezing, and prevents asthmatic attacks. Singulair is also recommended for individuals who experience difficulty in breathing while doing exercise.

Montelukast works by preventing a chemical called leukotriene from binding to its receptors in the cell. Leukotriene interacts with these receptors to cause swelling and tightening of air passages, which are characteristic of asthma and allergic reactions. However, it does not work during acute asthmatic attacks, but instead, needs to be taken regularly to prevent you from experiencing the symptoms.

Side Effects of Singulair

Possible side effects include:

  • headache

  • sore throat

  • earache

  • nervousness

  • nasal congestion

  • sinus pain and swelling

  • nausea

  • muscle weakness

  • numbness/tingling

  • shooting pain

Serious side effects include mental and mood changes, which manifest as agitation, aggression, trouble sleeping, anxiety, abnormal dreams, hallucinations, memory problems, sleep-walking, depression, and thoughts of self-harm or suicide.

Some surveys report that about 2% of people who regularly take Singulair have experienced weight gain. However, there is no solid evidence that shows that Singulair can directly cause this effect. Other factors may be involved. For example, it is very likely that patients who take Singulair regularly are also taking other medications to control their allergies or asthma. These include inhaled or oral steroids, bronchodilators, and other types of drugs, which may cause changes in appetite and weight gain. These patients may also have coexisting conditions such as obesity, high blood pressure, diabetes, high cholesterol, etc, which may influence weight changes. Lifestyle factors, diet, age, and genetic factors may also contribute to weight gain in patients taking Singulair.


Doctors prescribe medications such as Singulair because they believe that their benefits far outweigh their possible side effects in the treatment of your medical condition. With this in mind, one should take Singulair as directed. Tell your healthcare provider if you have any medical condition or other current medications, which may affect the use of this drug. Inform your doctor if you have any allergies to this drug or other drugs.

Singulair should be used regularly to prevent asthmatic attacks and symptoms of allergies.

Do not stop taking Singulair abruptly, change the recommended dosage, or substitute the drug with another without consulting your doctor. It does not work for acute attacks, but it should still be taken as directed. Use your bronhodilators and allergy medications for acute attacks and seek medical help as needed.

Report any significant side effects to your doctor and seek immediate help if you experience allergic reactions to the drug (rashes, itching, severe dizziness, swelling of the face/throat/tongue, trouble breathing), as well as serious side effects such as depression and hallucinations.

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