The advice also stresses the need to make sure that children take medicine for conditions such as attention deficit hyperactivity disorder or for behavioural problems on the trip.

BBC: NEWS | Health | Homesickness 'can be prevented'

Many are concerned that Ritalin and similar drugs, which aid concentration in those with Attention Deficit Hyperactivity Disorder, are chemical straightjackets that prevent children from taking full responsibility for themselves.

FORBES: Ritalin 'Doesn't Turn ADHD Children Into Robots'

One of the children they placed was a ten-year-old boy with attention deficit disorder and hyperactivity.

NPR: Religious Exemption Sought for Gay Adoption Law

Compared with studies in many thousands of children and adolescents -- including studies lasting many years -- as of 2007, the effects of homeopathy for attention deficit hyperactivity disorder, or ADHD, had been studied with even minimal rigor in only four studies.

CNN: Do homeopathic treatments for ADHD work?