We have studied the clinical usefulness of Flumazenil to reverse the sedative action of Midazolam in 12 children admitted in a Pediatric Intensive Care Unit. Two groups were established, one treated with individual dose and the other treated with continuous infusion. In four cases the indication of Flumazenil was the reversion of secondary effects and in 8 cases it was elective. The average reversion time was 1.22 +/- 0.42 minutes. Flumazenil is able to reverse immediately the effects of Midazolam.