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Endogenous Opioid System
The human body possesses an endogenous opioid neurotransmitter system. This system naturally produces small amounts of opioid compounds that bind to opioid receptors, resulting in pain reduction and feelings of euphoria.
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Diagram of psychoactive drugs
Opioids
Stimulants
Cannabinoids
Empathogens
Psychedelics
Dissociatives
Hallucinogens
Psychologically Addictive Psychoactive Drugs
Depressants (Sedative-Hypnotics)
Psychoactive Drugs' Interaction with Neurotransmitter Systems
Endogenous Opioid System
National Institute on Drug Abuse (NIDA) Resources
An individual is observed to have constricted pupils, slurred speech, and a significantly slowed breathing rate. They appear drowsy and disoriented. This specific combination of physiological and behavioral effects is most characteristic of which class of psychoactive substances?