Which of the following statements is true regarding Schedule II controlled drugs?

Schedule II controlled drugs are known for their high potential for abuse and for being associated with severe psychological or physical dependence, yet they have accepted medical uses in the United States. This classification allows for their use in clinical settings, particularly for the management of severe pain. Medications like opioids and certain stimulants fall into this category and are essential for treating conditions where severe pain relief is necessary.

The option regarding their prescription status is essential to understanding why they are prescribed specifically for severe pain management. These drugs are frequently utilized when other treatment modalities are insufficient, demonstrating their importance in medical practice.

The other statements do not align with the regulations surrounding Schedule II drugs. Specifically, these drugs are strictly controlled, and it is illegal to purchase them without a prescription, as highlighted in the option about purchasing. Moreover, while certain regulations exist regarding prescribing, the requirement for special registration is not universally applicable, making the option stating that a special registration is needed less accurate compared to the use for severe pain management. Thus, while important to comprehend the restrictions and regulations surrounding Schedule II drugs, the primary function they serve in pain management underscores the correctness of the chosen statement.