Aug 2, - Definition of Controlled Substance Schedules carisoprodol (Soma), clonazepam (Klonopin), clorazepate (Tranxene), diazepam (Valium). Generally, a controlled substance is an illegal drug that can have a detrimental Examples include heroin, LSD, marijuana, peyote, and ecstasy. for abuse than Schedule III drugs, and include Xanax, Soma, Klonopin, Valium, Ativan, Versed. Schedule I drugs, substances, or chemicals are defined as drugs with no currently Xanax, Soma, Darvon, Darvocet, Valium, Ativan, Talwin, Ambien, Tramadol.