Singulair is a prescription medication usually prescribed to treat asthma or allergies. For people with asthma, Singulair is used to treat exercised-induced asthma episodes or as a maintenance drug to prevent acute attacks. It is available either as a tablet taken orally, or, for younger children, as oral granules added to a food or beverage. Most people who take Singulair experience few, if any, side effects, but it is important to monitor any changes after you begin taking the drug.
Signs of Liver Damage
Some people taking Singulair experience liver damage, a very serious condition. Signs of liver damage include jaundice, dark urine and pain in the upper part of the abdomen. If you experience these symptoms, contact your doctor immediately.
Mood and Personality Changes
Another serious side effect of Singulair is mood changes or changes in personality. Contact your doctor immediately if you become depressed, have suicidal thoughts, become aggressive or agitated, or have hallucinations.
Respiratory Problems
If your breathing problems become worse while taking Singulair or you begin wheezing, contact your doctor.
Stomach Trouble
Some less serious side effects of Singulair include indigestion, upset stomach and nausea. These do not indicate a serious problem. However, you should contact a doctor if you experience severe stomach pain or vomiting.
Headache
Some people taking Singulair report an increase in headaches as a result of taking this oral medication. This is not a sign of a serious problem.
Other Side Effects
People taking Singulair report other non-serious side effects, such as nasal congestion, dizziness, weakness and fatigue.
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