Which of the following drugs is NOT categorized as an opioid?

• A. Morphine
• B. Oxycodone
• C. Heroin
• D. MDMA (ecstasy)

Answer: (D)

MDMA, commonly known as ecstasy, is not categorized as an opioid. Opioids are a class of drugs that include both natural and synthetic substances derived from the opium poppy, primarily used for pain relief. Morphine, oxycodone, and heroin all belong to this category and work by binding to opioid receptors in the brain and spinal cord to relieve pain and induce feelings of euphoria.

In contrast, MDMA is classified as a psychoactive substance, specifically an empathogen or entactogen. It primarily affects serotonin levels in the brain, leading to increased feelings of emotional closeness, euphoria, and enhanced sensory perception, rather than producing the analgesic effects characteristic of opioids. Understanding these classifications helps distinguish between the various types of substances and their effects on the body.