Prescriptions of ADHD medication have more than doubled in Northland for an unlikely demographic - those over 50 years old.
Current year figures were on track to be more than triple 2013 figures.
The neurodevelopmental Attention Deficit Hyperactivity Disorder (ADHD) is characterised by attention difficulties and behaviour troubles, among other symptoms, and is mostly found in children and adolescents.
A minority continued to have symptoms into adulthood.
However, new figures released by government drug buying agency Pharmac indicated a sharply increasing number of adults were using medication for ADHD.
However, Dr Rucklidge said research showed the long-term efficacy of ADHD medication was dubious, and the Government must consider whether rapidly increasing prescription rates were appropriate, particularly for young people.
"It should probably be more cautiously considered. There are other treatments ... It is an easy way out."