[Effectiveness of chlormezanone and flunitrazepam in treatment of difficult children]. 
Out of a total of 366 preschoolers, aged 3-5 years old, from the urban area of Curacautín, a sample of 46 children is selected using a behavioral classification to choose those children difficult to manage.  A double-blind type investigation is realized using a posology of the drugs: Chlormezanone and Flunitrazepam as well as a placebo.  The distribution of the doses is in accordance with the so called "Latin Table".  The results obtained indicate that both drugs are effective, with a 90.6% success rate case of Chlormezanone and 92.8% effectiveness in the case of Flunitrazepam.  In terms of the placebo, the success rate was 15% with a higher rate in the third medication, possibly due to better psychological predisposition on the child's part.