Efficacy and safety of montelukast–levocetirizine combination therapy in combined allergic rhinitis and asthma syndrome: a systematic review and meta-analysis

In summary, this meta-analysis demonstrated the efficacy of montelukast combined with levocetirizine in the treatment of nasal symptoms in AR with asthma, indicating that the combination of montelukast with levocetirizine is more effective in improving symptoms of allergic rhinitis than monotherapy and has good safety.