OBJECTIVE: To evaluate the effectiveness of Bach flower remedies in the treatment of children with attention deficit hyperactivity disorder (ADHD), in a double blind prospective controlled study. METHODS: Fourty Children with ADHD, aged 7-11 years, diagnosed according to the DSM criteria, were randomised to Bach flower remedies or placebo treatments for a period of 3 months. Children's performance was evaluated by the teacher before commencement of treatment and subsequently each month during the study period. RESULTS: Bach flower remedies have no statistically significant effect when compared to placebo in the treatment of children with ADHD. There was a significant correlation between treatment duration's and improvement of performance, with no difference between the treatment group compared to the placebo. CONCLUSIONS: There is no statistically significant difference between the effects of Bach flower remedies compared with placebo in the treatment of children with ADHD.