Xanax, a trade name for the generic drug alprazolam, is an anxiolytic benzodiazepine and a minor tranquilizer. The company initially sold the drug as a treatment for panic disorders. By 2010, it became the most prescribed and abused benzodiazepine in the market. Clonazepam is a tranquilizer under the benzodiazepine drug group. Pharmacies often sell it under the brand name Klonopin. The drug first became available in the United States in 1975 when the Hoffman La Roche Company introduced the drug. Drug Education