When prescribing montelukast (singulair) for asthma, patients or parents of patients should be instructed as follows: ?

When prescribing montelukast for asthma, the patient or parents of the patient should be instructed or to be reminded of the following as these things or events could occur when a patient is taking up the drug montelukast because of its properties; depression, suicidal thoughts, anxiety and aggression. 

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]