Which schedule of controlled substances can be prescribed but is highly addictive?

The correct answer is Schedule II. This category includes substances that have a high potential for abuse and addiction, along with severe psychological or physical dependence. Medications classified under Schedule II are strictly regulated and are only available through a prescription, which must be written and cannot be refilled. Examples include opioids like morphine and cocaine, as well as stimulants like amphetamines, all of which carry significant risks for misuse and addiction.

In contrast, Schedule III substances have a lower potential for abuse compared to Schedule II, while Schedule IV substances have an even lesser risk, and both can be prescribed with comparatively fewer restrictions. Schedule V substances carry the lowest risk of addiction and are often available without a prescription. Understanding these classifications helps in recognizing the relative risks and regulatory measures associated with different types of controlled substances.