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?

Opioid Drugs

Hallucinogen