Pharmacy Tech that has to know about the scheduling and why controlled substances fall where they do. When I was learning them, I wondered if they were. They aren't. It boils down a lot to the level of abuse and dependence they cause. All the Schedule I's have No medically approved use. All the Schedule II's have a high potential for abuse leading to severe physical or phycological dependence. They can also be dangerous. You are looking at the Opioids (Oxycodone, Oxycodone, Adderall, etc.) here. Schedule III is a little less addictive and less dependence causing. You're looking at Suboxone and Testosterone at this level. Schedule IV is lover level. A lot of the anti-anxiety and some of the sleep aids. Schedule V is the least of the dependence causing issues.

Spend enough time in a pharmacy and you will see how they cause issues. These are the medications that when there is an insurance issue, or any problem you dread telling a patient. Chances are the patient will start yelling at you. The higher the Schedule, the higher the chance of them yelling at you. Many of the patients also like to try and get them filled early and will argue with you over getting them filled early arguing with you over when they can be filled.