Drugs and substances with a risk for abuse are controlled substances. Most controlled substances are abused to alter mood, thought, and feelings. A person may be attempting to alleviate pain, anxiety, or depression. Or they may abuse them to induce sleep and increase energy.
The feel-good effect caused by many controlled substances contributes to their abuse. The greater extent a drug can produce euphoria, the more likely it will be abused.
Prescription medications with the highest potential for abuse are classified as Schedule II drugs. These medications have a currently accepted medical use in treatment in the U.S. or a currently accepted medical use with severe restrictions. When Schedule II drugs are abused, they may lead to severe psychological or physical dependence.