Which type of drugs are classified as Schedule I drugs?

Schedule I drugs are classified as substances that have a high potential for abuse and have no accepted medical use in treatment in the United States. This means that they are considered the most restricted category of drugs due to their high potential for addiction and lack of safe usage parameters. Examples of Schedule I drugs include heroin, lysergic acid diethylamide (LSD), and cannabis, among others. The classification reflects the view that these substances potentially pose significant risks to users and society.

In contrast, the other types of drugs mentioned in the other options are recognized as having legitimate uses within medical contexts or have been shown to have lower risks of abuse. Understanding the classification of drugs is fundamental for compliance with legal regulations and for ensuring safe medical practices.