Singulair is a drug used for decreasing asthma symptoms and preventing acute asthma attacks. When the body is exposed to an allergen, it releases chemicals called leukotrienes that lead to the occurrence of asthma symptoms. Singulair relieves the symptoms of runny nose, wheezing, itching and sneezing by inhibiting these leukotrienes in cases of seasonal or long-term allergies. It also prevents the occurrence of exercise-induced asthma attacks.
Hives or Swelling
Drugs.com states that hives are a serious complication of Singulair use. MedlinePlus says that the drug can also cause swelling on the face, lips, eyes, hands, feet, ankles, lower legs, tongue or throat. There may also be pain and swelling in the sinuses. Hives or swelling, along with difficulties in breathing or swallowing, are serious side effects of this drug and require emergency medical attention.
Skin Rashes and Numbness
Another serious complication of using Singulair is a rash, states Drugs.com. Users may also develop bruising on the skin. MedlinePlus reports that severe tingling, and a pins-and-needles sensation in the arms or legs, are serious complications that should not be ignored.
Stomach Pain and Discomfort
MayoClinic.com reports that Singulair users may experience stomach pain, stomach upset, heartburn, nausea and diarrhea as side effects from this medication.
Changes in Behavior and Mood
Drugs.com reports that the individual may also experience changes in mood or behavior. Anxiety, depression, and thoughts about hurting or killing oneself may also be experienced. There may be confusions about identity and place, or hallucinations.
Liver Damage
MayoClinic.com reports that loss of appetite, sleeplessness, breath odor, and yellowing of the skin and eyes may also occur as a result of taking Singulair. These side effects occur due to the damaging effect of the drug on the liver.
