Answer:
A a drug that slows nervous system activity and relaxes tension
Explanation:
Depressants are chemical substances that directly affect the Central Nervous System, causing a slow or low brain activity and are accompanied by feelings of relaxation, like when drinking alcohol, a legal depressant , or benzodiazepines, that are commonly more known as sleeping pills, they cause drowsiness, lowering levels of blood pressure, and other drugs like barbiturates, often have a big sedative effect.
Many different kinds of depressants include also substances coming from Opioids, for lessening pain, or Cannabis, commonly and recently studied for its Effects of Central Nervous System
Since the Central nervous system depressants increase the production of the neurotransmitter GABA, the sensations often associated to the brain will be opposed to the other antagonic processes : stimulating drugs.
