The nurse is assessing a client who is prescribed montelukast. Which clinical finding indicates the client is experiencing a therapeutic effect of the drug?

A. Improved mood: Montelukast is a leukotriene receptor antagonist used to manage asthma and allergic rhinitis. While mood changes have been reported as rare adverse effects, improvement in mood is not an indicator of therapeutic effectiveness. B. Increased bronchodilation: Montelukast does not act as a direct bronchodilator. Its mechanism involves blocking leukotrienes to reduce inflammation and prevent bronchoconstriction, so immediate bronchodilation is not expected. C. Reduced airflow: Reduced airflow indicates worsening airway obstruction, which suggests the drug is not achieving its intended therapeutic effect and may signal uncontrolled asthma. D. Decreased wheezing: A decrease in wheezing reflects reduced airway inflammation and bronchoconstriction, indicating that montelukast is effectively managing the client’s asthma symptoms and improving respiratory function.