Psychoactive Substances

Definition

Psychoactive substances are chemicals that affect the central nervous system, altering brain function and causing changes in perception, mood, consciousness, cognition, or behavior.

Related terms

Tolerance:

Tolerance refers to the reduced effect of a drug after repeated use. Over time, larger doses are needed to achieve the same desired effect.

Withdrawal:

Withdrawal is a set of physiological and psychological symptoms that occur when someone stops using a psychoactive substance after prolonged use.

Addiction:

Addiction is characterized by compulsive drug-seeking behavior despite negative consequences. It involves both physical dependence (tolerance and withdrawal) and psychological dependence (craving and loss of control).