Jan 26, - Schedules, Harmfulness, Degree of control, Examples of listed drugs Very strict; 'the drugs in Schedule I are subject to all measures of control . UN71 Schedule III (buprenorphine, cathine) and IV (barbital, diazepam). 2. Lorazepam is a Schedule IV drug under the Controlled Substances Act in the U.S. and internationally under the United Nations Convention on Psychotropic Substances. It is a Schedule IV drug under the Controlled Drugs and Substances Act in medicalcases.eu of action: 1–5 min (IV), 15–30 min (IM). See 21 U.S.C. §(32)(A) for the definition of a controlled substance analogue and 21 Examples of Schedule IV substances include: alprazolam (Xanax®).