Lorazepam. Molecular model of the drug lorazepam (C15.H10.Cl2.N2.O2), a high-potency benzodiazepine drug used for treating anxiety, insomnia and acute seizures, and for sedating hospitalised patients and aggressive patients. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and chlorine (green).