Drugs classified under Schedule I are characterized primarily by what factor?

Drugs classified under Schedule I are characterized primarily by a high potential for abuse. This classification means that these substances are considered to have the highest risk of addiction and are not accepted for medical use in the United States. Often, Schedule I drugs are associated with severe safety concerns and a lack of accepted safety for use under medical supervision.

Common examples of Schedule I substances include heroin and lysergic acid diethylamide (LSD). The categorization reflects societal and medical concerns regarding their potential for misuse. This classification directly impacts how these substances can be regulated, researched, and accessed within the healthcare system.

In contrast, drugs with a moderate potential for abuse, low potential for abuse and dependence, or those considered to possess high therapeutic value would fall under different schedules, indicating their varying levels of risk and acceptable medical use.