If someone ingests a drug for the purpose of being livelier and more outgoing at a party, but finds the drug actually slowing their system down, and perhaps impairing their thinking and behavior, then is probably the drug that was ingested.

A depressant(alcohol)

Explanation:

Alcohol as a drug belongs to the drug classification known as depressant and other Examples are cannabis, barbiturates and many others. Depressants are used for 'depressing' or slowing down the activities of the nervous system.

Although, alcohol is a depressant, it also exhibit the stimulant effects that is to say it can be used for stimulation when small quantity is being ingested.

That person ingested it so that he or she can be ''livelier and more outgoing at a party" that is to say for stimulation and the part at which the drug was slowing their system down is the effect of the depressant.

This question lacks options, options are:

a) nicotine

b) caffeine

c) alcohol

d) heroin

The correct answer is c) alcohol .

Explanation:

Alcohol is a central nervous system depressant drug that progressively inhibits brain functions, this means that it slows down the functioning of the central nervous system. Alcohol affects the individual in a detrimental way without leaving aside the alteration of neurotransmitters since they start from large neural connections that make the individual behave in a certain way, but when there is an alcohol consumption these neurotransmitters do not work in an adequate way, disturbing our perception, emotions, movements, senses, among others, in each individual, alcohol acts differently, in some people it can intervene passively or actively. In very small amounts, alcohol can help a person feel more relaxed or less anxious, increasing his/her sociability.