Aug 2, - The FDA started listing drugs by classification, or drug schedules, clonazepam (Klonopin), clorazepate (Tranxene), diazepam (Valium). Valium official prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions, pharmacology and more. Drug classifications have officially been in place since the s, when President Nixon signed the You can purchase these drugs at a pharmacy with a prescription, but you generally will not find Xanax; Soma; Klonopin; Valium; Ativan.