Bromo-Dragonfly (BDF) is a designer drug chemically related to LSD and amphetamine. The first registration in Denmark was in October 2007. In the present case an 18-year-old man ingested about 2 ml BDF and developed acute psychosis. At the hospital the patient displayed, hyperpyrexia, tachycardia, tachypnea and hypertension. Because of severe hallucinations and agitation the patient was detained at the hospital and received symptomatic treatment with large doses of benzodiazepines. Four days after hospitalization, the patient discharged himself without significant symptoms or paraclinical findings.