"What is Xanax?" is a frequently asked question among users of this drug. This question is based on the misuse of this drug, which is derived from the benzodiazepine lofexidene. In its purest form, it is known as alprazolam, a tranquilizer with a distinctive odor. In the past, the treatment of anxiety and insomnia was based on this substance but because of its numerous side effects it has been replaced with newer benzodiazepines.