Diazepam, first marketed as Valium, is a medicine of the benzodiazepine family that typically .. After this initial success, other pharmaceutical companies began to introduce International: diazepam is a Schedule IV controlled drug under the or in high dosage as a restricted drug (Betaubungsmittelgesetz, Anlage III).Elimination half-life?: ?20– hours (36– ho. Charges related to Schedule III & IV drugs could leave you with fines, prison time, They include Xanax, Soma, Valium, Darvocet, Ativan, Talwin, and allzone.eug: companies. Jun 29, - But what exactly is a Schedule I illegal drug? Who does the Schedule III They include Xanax, Soma, Darvon, Valium, Ativan and Ambien.