“…This study reported a high prevalence of adverse drug reactions among 123 patients (31.9%), sleep disturbance was the most common (ADRs). Since 2008, there has been an increasing number of reports on potential adverse drug reactions to montelukast, including irritability, aggressiveness, and sleep disturbances, usually occurring after 1 week of commencing therapy and occurring in up to 10% of children [ 3 , 4 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ]. The World Health Organization (WHO) pharmacovigilance database reported multiple adverse effects, including depression, headache, aggression, suicidal ideation, anxiety, insomnia, abnormal behavior, nightmares, shortness of breath, abdominal pain, nausea, rash, dizziness, myalgia and muscle spasm [ 53 ].…”