What are hallucinogens in medical term & it's effects?

In medical term, hallucinogens are the drugs that cause both negative and positive effects. The hallucinogens when addictd by individuals put an effect on the central nervous system altering the individuals' thoughts, feelings. They cause illusion effects i.e objects and sounds that are seen but are not actually present.

Its effects may cause severe damage to central nervous system leading to unconsciousness and even death.

Some natural hallucinogens are lysergic acid diethyamide (LSD), Psilocybin and artificial hallucinogens include methylenedioxy methamphetamine (MDMA)