Blocks leukotrienes, substances that narrow airways and cause asthma symptoms.
Additional information: It is important to use this medication as prescribed by your doctor. Do not use more than the recommended dosage.It is not a cure for asthma, but it can help to control the symptoms and prevent attacks.It may cause side effects such as hoarseness, dry mouth, and nosebleeds.If you are pregnant or breastfeeding, talk to your doctor before using this medication.Keep this medication out of the reach of children.