1. Drugs or substances that cause hallucinations and alter perception, mood, and cognitive processes.
Usage: Plural form; countable noun; Used in medical, scientific, and educational contexts

Examples

• Researchers are studying how hallucinogens affect brain activity.
• Some hallucinogens like LSD were used in psychological experiments in the 1960s.
• The effects of hallucinogens can include visual distortions and altered sense of time.
• Certain hallucinogens are derived from natural plants and fungi.
• Medical professionals are investigating therapeutic uses of hallucinogens for treating depression.
• Hallucinogens are controlled substances in most countries.