Provide an example of a Schedule II controlled substance.

Oxycodone is classified as a Schedule II controlled substance because it has a high potential for abuse, which may lead to severe psychological or physical dependence. Schedule II substances are recognized for their medical use but require strict regulations regarding their prescribing and dispensing due to the associated risks. Oxycodone is commonly prescribed for the management of severe pain, making it essential for medical purposes despite its potential for misuse.

In contrast, aspirin and ibuprofen are non-steroidal anti-inflammatory drugs (NSAIDs) that are available over the counter and do not fall under the controlled substances act. Antihistamines are also typically non-controlled substances used to treat allergy symptoms and are not classified under any schedule due to their lower potential for abuse. This distinction illustrates the regulatory framework surrounding controlled substances and why oxycodone fits the criteria of a Schedule II drug.