“…Since 2000, the dispensing of methylphenidate (MPH), a prescription stimulant medication commonly used in the treatment of attention deficit hyperactivity disorder (ADHD), has significantly increased worldwide in children and adults [1][2][3][4][5][6][7][8], the concern actually are for efficacy and safety of the long term use for all the users (principally for young people where MPH is authorized in ADHD; and the use for young children (<6 years) and adults for whom MPH isn't authorized (only for narcolepsy in adults). To established and assess the patterns of this increase, numerous studies have been performed across a wide range of countries, with the aim of estimating the prevalence of MPH use and associated factors (European countries [2,5,6,8,[10][11][12][15][16][17][18], United States [3,13,14], and Australia [14]).…”