Which of the following is NOT classified as an opioid?

Methamphetamine is classified as a stimulant, whereas opiates and opioids, like hydrocodone, fentanyl, and oxycodone, are derived from opium or synthesized to mimic its effects. Opioids are primarily used for pain relief and can lead to dependence and addiction, making it essential to distinguish them from other classes of drugs. The distinction is crucial in the field of chemical dependency counseling, as understanding the nature of substances can guide treatment strategies and educational efforts for clients dealing with addiction. Therefore, recognizing methamphetamine as a stimulant rather than an opioid is key to understanding the different categories of substances and their respective impacts on individuals.