Final answer:
Anxiolytics and tranquilizers work by enhancing the activity of the neurotransmitter GABA in the brain, resulting in a calming and sedative effect.
Step-by-step explanation:
Drugs called anxiolytics or tranquilizers, such as diazepam (Valium) and alprazolam (Xanax), work by enhancing the activity of a neurotransmitter called gamma-aminobutyric acid (GABA) in the brain. GABA is an inhibitory neurotransmitter that helps to reduce the activity of nerve cells, resulting in a calming and sedative effect. By increasing the effects of GABA, anxiolytics and tranquilizers can help to reduce anxiety and promote relaxation.