What Does Psychoactive Mean?
What the word psychoactive means, how it differs from psychedelic, hallucinogen, dissociative and entactogen, and why the word alone says nothing about safety or benefit.
Content last updated . This page has not been medically reviewed.
Psychoactive means "affects the mind"
The World Health Organization (WHO) describes psychoactive drugs as substances that, when taken in or administered into the body, affect mental processes such as perception, consciousness, cognition, mood and emotions. [1] WHO places them inside a broader group of psychoactive substances that also includes alcohol and nicotine. [1]So "psychoactive" is a very wide word. It names an effect on the mind. It does not name a chemical family, a plant, a legal status or a medical use.
What the word does not tell you
WHO notes that "psychoactive" does not necessarily mean a substance produces dependence. [1] WHO also says that using psychoactive drugs without medical supervision is associated with significant health risks. [1] Put together, the word describes what a substance does to the mind. It is not a verdict on whether the substance is safe, useful, approved or controlled. Those questions need to be asked about each substance separately, which is what the other pages in this library do.Psychoactive versus psychedelic and related words
Several narrower words sit inside "psychoactive". They are used in different ways by different writers, so this site defines each one the way its sources do.| Word | How sources use it |
|---|---|
| Psychoactive | Any substance that affects mental processes. [1] |
| Psychedelic | From the Greek for "mind manifesting"; compounds that alter consciousness by acting on serotonin receptors. The word was first proposed by Humphry Osmond in 1956. [2] |
| Hallucinogen | An older, broader word. Some people use it for all or some psychedelic and dissociative drugs. [3] One scientific primer links it to the perceptual side of the experience. [2] |
| Dissociative | Drugs that mainly affect how the brain handles the chemical glutamate and can make people feel disconnected from their body and surroundings. [3] |
| Entactogen (or empathogen) | A word that stresses social and emotional effects. [2] |
| Entheogen | A word that stresses a spiritual aspect of use. [2] |
How researchers group these substances
The US National Institute on Drug Abuse (NIDA) says researchers still debate how to describe and classify these drugs, and generally group them by how they work in the brain. [3] NIDA uses three groups: psychedelic drugs that primarily influence how the brain processes serotonin, dissociative drugs that primarily affect how it processes glutamate, and an "other" group such as MDMA, ibogaine and salvia that affect a variety of brain functions. [3]The US Food and Drug Administration (FDA) uses "psychedelic drug" in its 2026 clinical-trial guidance as shorthand for classic psychedelics, typically understood to be 5-HT2A receptor agonists such as psilocybin and LSD, together with entactogens or empathogens such as MDMA. [4] FDA adds that its concepts may also apply to other related products that can cause perceptual disturbances and alterations in consciousness. [4] That is a regulatory shorthand for a guidance document, not a statement that these substances are alike.
How this library uses the words
- Psychoactive is the umbrella word.
- Classic psychedelics are covered in Classic Psychedelics: What the Term Covers.
- Dissociatives and entactogens each have their own pages: Dissociatives and Entactogens.
- Terms used across the library are collected in the glossary.
Education only
This page explains vocabulary. It does not tell anyone how to find, prepare or use any substance. If you take medicines or have a health condition, talk with a clinician before anything that affects the mind: talking with a health professional.Frequently asked questions
Is every psychoactive substance a drug of abuse?
No. WHO says "psychoactive" does not necessarily imply that a substance produces dependence. [1] The word only says that a substance affects mental processes.
Are psychoactive and psychedelic the same thing?
No. Psychoactive is the wide umbrella. Psychedelic is one narrower word, usually tied to acting on serotonin receptors. [1][2]
Is alcohol psychoactive?
By WHO's description, yes. WHO lists alcohol and nicotine within the broader category of psychoactive substances. [1]
Does "psychoactive" mean a substance is dangerous?
Not by itself. The word describes an effect on the mind. WHO does say that use of psychoactive drugs without medical supervision is associated with significant health risks, so each substance needs its own risk review. [1]
Is "hallucinogen" a precise term?
Not very. NIDA notes that some people use it for all or some psychedelic and dissociative drugs, and researchers debate how to classify these drugs. [3]
References
- World Health Organization, Drugs (psychoactive). Read 2026-10-22.
- Kelmendi B et al. Psychedelics. Curr Biol. 2022;32(2):R63-R67. Read 2026-10-22 (abstract on PubMed).
- National Institute on Drug Abuse, Psychedelic and Dissociative Drugs. Read 2026-10-22.
- US Food and Drug Administration, Psychedelic Drugs: Considerations for Clinical Investigations, Guidance for Industry (July 2026). Read 2026-10-22.