Halcion is a member of the benzodiazepine class of pharmaceuticals that are well known for their depressant activity on the central nervous system. The benzodiazepines are a versatile group of drugs and are used for a wide spectrum of applications including relief of nervousness or tension, treatment of insomnia, muscle relaxants, treatment of panic disorder, and convulsive disorders. Halcion is used primarily to combat insomnia on a very short-term basis. When taken for over two weeks, Halcion usually loses it's effectiveness. Side effects include difficult in concentrating, confusion, convulsions, hallucinations, and impaired memory.