Singulair is a medication used to treat asthma and allergies. It is taken to control daily symptoms; however, Singulair is most effective in preventing asthma rather than in treating a sudden asthma attack, according to the Mayo Clinic. Singulair works by blocking the effects of chemicals known as leukotrienes, compounds that interact with lung receptors and cause the airways to constrict, producing the symptoms of asthma. Leukotrienes also play a role in allergy symptoms, which includes seasonal allergies. This leukotriene inhibitor blocks their effects, the Mayo Clinic reports.
Gastrointestinal Distress
Some gastrointestinal problems such as indigestion or belching, heartburn and general stomach upset have been associated with taking this medication. Other potential common side effects include abdominal pain, nausea and vomiting, diarrhea and mouth or tooth pain.
Cold or Flu-like Symptoms
This medication may cause cold or flu-like side effects such as a stuffy nose, sinus pain or sinus infections and fatigue, Drugs.com reports. Fever as well as hoarseness, a sore throat and coughing may result. Other symptoms that can occur are general aches, headaches and trouble sleeping. At times, this medication has been associated with upper respiratory tract infections and ear infections.
Psychological Changes
In severe and rare cases, Singular may be associated with serious mood changes and behavior problems, according to Drugs.com. For example, some individuals on Singulair may experience major anxiety with an irregular or rapid heartbeat. Depression may be experienced. as well as significant behavior changes such as agitation and increased aggression. Other symptoms may include delusions or hallucinations and suicidal thoughts. If any of these effects occur, medical attention is needed immediately.
Rare Side Effects
Very rare side effects have been reported. Liver injury or damage may result as indicated by abnormal liver functions blood tests and jaundice, the Mayo Clinic reports. An example is the inflammation of the liver or cholestatic hepatitis. Also, pancreatitis or inflammation of the pancreas is a rare potential effect. Nosebleeds, bleeding disorders or easy bruising are other possible occurrences, according to the Mayo Clinic. In very rare cases, seizures may be produced. A physician needs to be contacted immediately if any of these problems occur.
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