When hearing the word "Opioids," many people immediately associate it only with illegal narcotics. In reality, opioids are a class of central nervous system depressants that are highly effective at relieving pain. Many substances in this class are medications that physicians use daily to treat patients. However, their use requires strict medical supervision due to a high risk of addiction if misused.

What Are Opioids?
Opioids work by binding to opioid receptors in the brain and spinal cord, reducing the perception of pain and inducing a sense of calm and relaxation. This exact mechanism makes them both medically valuable and inherently risky for dependency at the same time.

Examples of Opioid Substances

• Medically Supervised Prescription Opioids: Such as Morphine, Codeine, Tramadol, and Methadone. In Thailand, these are classified as Category 2 Narcotics—substances with legitimate medical utility that strictly require a prescription and direct physician oversight.
• Completely Illicit Opioids: Substances with no recognized medical indications, such as Heroin, which is categorized as a Category 1 Narcotic due to its severe danger and high potential for harm.
• Commonly Misused Opioids: Prescription opioid pain relievers that are more easily accessible than expected, often consumed in excessive doses or taken without a doctor's prescription.

Why Are Opioids So Addictive?
With continuous use, the body develops tolerance, requiring increasingly higher doses to achieve the same effect. When use stops abruptly, painful and distressing withdrawal symptoms occur. Consequently, many individuals continue taking opioids simply to escape withdrawal rather than seeking recreational euphoria.