Singulair® (montelukast sodium) is a prescription drug approved for the treatment of asthma and allergic rhinitis. By blocking certain chemicals in the body, the medication can help improve asthma symptoms, reduce asthma attacks, and relieve common nasal allergy symptoms. Singulair comes in the form of tablets, chewable tablets, and oral granules. While most people tolerate the medicine well, potential side effects include abdominal (stomach) pain, headaches, and the flu.
(To learn more about this drug, click Singulair. This article contains dosing information for Singulair, explains when and how to use the drug, and lists potential overdose symptoms. You can also click any of the links in the box to the right for specific information.)