Final answer:
Psychoactive drugs that prevent neurotransmitters' reuptake are generally antidepressants, particularly SSRIs such as Prozac, Paxil, and Zoloft, which enhance serotonin's impact in the brain.
Step-by-step explanation:
Psychoactive drugs that work by preventing the reuptake of neurotransmitters are typically antidepressants. In contrast to agonists and antagonists, which operate by binding to receptor sites, reuptake inhibitors such as selective serotonin reuptake inhibitors (SSRIs), allow neurotransmitters like serotonin to remain active in the synaptic cleft for longer, enhancing their impact. Well-known SSRIs include Prozac, Paxil, and Zoloft. Other classes of psychoactive drugs include stimulants which increase mental and/or physical function, depressants which reduce arousal or stimulation, and hallucinogens like LSD, which affect serotonin receptors.