Final answer:
The question compares different classes of psychoactive drugs, including narcotics like heroin, stimulants like amphetamine (dexedrine), and hallucinogens like LSD, which cause various changes in perception, mood, and consciousness.
Step-by-step explanation:
The question provided is discussing various classes of psychoactive drugs and specific examples within each class. Narcotics like heroin are opioid painkillers, which also include drugs such as fentanyl, morphine, oxycodone, Vicodin, and methadone. These are known for their pain-relieving properties and potential for abuse.
Amphetamines, which include drugs like dexedrine, are a class of stimulants that increase alertness and wakefulness. Empathogens, like MDMA, are a subclass that produce feelings of empathy and are often included in the broader category of amphetamines.
Hallucinogens cause profound distortions in a person's perceptions of reality. Examples of hallucinogens include LSD, psilocybin, and mescaline. These drugs can lead to hallucinations and shifts in thoughts or emotions.