Halcion is an orally taken FDA-approved medicine that acts as tranquilizer that relaxes the central nervous system. It’s a depressant from the triazolobenzodiazepine (TBZD) class of drugs. This class consists of a popular series of pharma products known as benzodiazepine, which emerged in the sixties as a common form of relaxation medication. It’s typically prescribed for severe insomnia.