Final answer:
Adolf von Bayer discovered depressant drugs, which are psychoactive medications that suppress the central nervous system and are used to reduce anxiety, induce sleep, relieve pain, and create a sense of calm or euphoria. Barbiturates and benzodiazepines are examples of these drugs, with the latter now being more commonly used due to safety considerations.
Step-by-step explanation:
Adolf von Bayer discovered depressant drugs, a type of psychoactive substance that has a calming effect on the central nervous system.
These substances are commonly used as hypnotic sedatives, tranquilizers, or anti-convulsive/anti-anxiety medications due to their ability to serve as agonists of the gamma-Aminobutyric acid (GABA) neurotransmitter system.
GABA has an inhibitory effect on the brain, leading to reduced anxious feelings, induction of sleepiness, and even euphoria in some cases.
Barbiturates, for instance, were originally used as sleep aids before being largely replaced by benzodiazepines due to their lower addiction and overdose potential.
While benzodiazepines and barbiturates can treat anxiety and insomnia, they can also induce sedation, hypnosis, muscle relaxation, and possess anticonvulsant properties.