Which of the following substances is NOT a part of Schedule II?

The correct answer identifies a substance that is not categorized as a Schedule II drug under the Controlled Substances Act. Amobarbital is primarily classified as a Schedule II drug, which makes it subject to strict regulations due to its potential for abuse and dependency.

Hydrocodone, Methadone, and Morphine are all classified as Schedule II substances because they have legitimate medical uses but also carry a high risk of addiction and abuse. Methadone, while used in treatment programs for opioid dependence and chronic pain management, is recognized for its addiction risk, thus placing it firmly in this schedule.

In contrast, Amobarbital is categorized differently due to its applications and regulatory status; while it can still pose risks, it is often listed under Schedule IV when formulated as a combination product with other medications. Understanding the classifications in drug scheduling is crucial for determining how to legally handle prescription medications in practice.