Zyflo is the brand name of zileuton, a prescription medication used to prevent asthma attacks. According to eMedTV.com, Zyflo belongs to a family of medications called leukotriene synthesis inhibitors, which reduce the inflammation or constriction of the airways. These type of medications are effective in treating asthma symptoms because they reduce the production of leukotrienes, the chemicals produced by the body when allergens or other airway irritants are present. As with any medication, Zyflo has the risk of side effects.
Less Serious Side Effects
As reported by eMedTV.com, the most common side effects include headaches, indigestion, pain, nausea, abdominal pain, weakness, accidental injury and muscle pain. It also reports other common effects that occur in fewer than 1 to 3 percent of patients. These include joint pain, pain in the chest, pink eye, constipation, dizziness, fever, gas, muscle tension, insomnia, swollen glands, neck pain, nervousness, drowsiness, urinary tract infection or vomiting. These side effects are usually harmless unless they are persistent or bothersome.
Serious Side Effects
Serious side effects should be reported to your doctor right away. According to eMedTV.com, these may include yellowing of the eyes or skin (jaundice), darkening of the urine, pain in the upper abdomen or changes in urination. The Physicians' Desktop Reference lists other serious side effects, including tiredness, lack of energy or flu-like symptoms.
Allergic Reaction
A serious allergic reaction can potentially be fatal if it goes without treatment. Signs of a serious allergy, according to eMedTV.com, include hives, itching of the skin, swelling of the mouth, swelling of the face, swelling of the throat or trouble breathing.
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