Which type of drug is classified under Schedule II?

Schedule II drugs are classified as having a high potential for abuse, which can lead to severe psychological or physical dependence. Despite this high potential for abuse, these drugs are deemed to have accepted medical uses in treatment in the United States. This classification includes medications that are frequently prescribed for pain management, attention-deficit hyperactivity disorder (ADHD), and other conditions, and they require a prescription from a licensed healthcare provider.

The other choices do not accurately reflect the characteristics of Schedule II drugs. The option that indicates use only in research pertains to Schedule I substances, which are not accepted for medical use. The choice involving over-the-counter availability without restrictions contradicts the controlled nature of Schedule II drugs, as they cannot be accessed without a prescription. Lastly, the mention of supplements with low abuse potential aligns more closely with categories of drugs that fall under Schedule III, IV, or even over-the-counter classifications, rather than Schedule II. Therefore, the classification under Schedule II is specifically defined by its accepted medical use alongside a recognized high potential for abuse, which is precisely why the correct answer is focused on its acceptance for medical use despite the associated risks.