Montelukast is best used as an adjunctive drug. It is best when used for the treatment of allergic rhinitis, asthma, and exercise induced bronchoconstriction (EIB). The brand name is Singulair. This drug works through selectively inhibiting the cysteinyl leukotrienes which leads to pulmonary and nasal mucosal benefits along with the alteration of the inflammation process. This comes in several dosage forms being 4 mg packets/granules, a 10 mg tablet, and in 4 mg and 5 mg chewable tablets. Common side effects include dizziness, fatigue, urticaria, and infection. There is a black box warning for serious neuropsychiatric events so it is very important to access/watch for serious signs and symptoms that may be of neuropsychiatric nature, and to weigh the risk/benefits for patient usage.