The immediate administration of alcohol leads to various alterations in consciousness, with effects varying by dosage. Low doses typically produce feelings of euphoria, while higher doses result in sedation. In general, alcohol consumption impairs cognitive and motor functions, leading to slower reaction times, reduced visual acuity, decreased alertness, and a loss of behavioral control. Excessive intake can cause a complete loss of consciousness and memory blackouts, where an individual cannot recall events that happened while intoxicated.

Effects of Acute Alcohol Administration

A patient is prescribed a medication to manage severe anxiety and insomnia. The medication is identified as a benzodiazepine, which works by quieting brain activity. Based on this information, which category of psychoactive drugs does this medication fall into?

Ethanol, commonly referred to as alcohol, is a psychoactive drug classified as a depressant because it suppresses central nervous system activity. While low doses can induce feelings of euphoria, higher doses lead to sedation.

Ethanol (Alcohol)

Barbiturates and benzodiazepines are classes of psychoactive drugs classified as depressants. They share in common their ability to serve as agonists of the gamma-Aminobutyric acid (GABA) neurotransmitter system. When these drugs bind to their specific receptor sites on the GABA-gated chloride ($$\text{Cl}^-$$) channel, they open the chloride channel. This allows negatively-charged chloride ions ($$\text{Cl}^-$$) to enter the neuron's cell body, changing its charge in a negative direction and pushing the neuron away from firing. Because of this quieting effect on the brain, these types of drugs are often prescribed to treat both anxiety and insomnia.

Barbiturates and Benzodiazepines

Alcohol, barbiturates, and benzodiazepines are examples of depressant drugs.

Google

Columbia University

Depressants, also known as sedative-hypnotics, are a class of psychoactive drugs that suppress the activity of the central nervous system. Due to their quieting effect on the brain, they are often prescribed by medical professionals to manage conditions such as anxiety and insomnia.

Depressants (Sedative-Hypnotics)

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Examples of Depressants

* Decreased heart rate
* Decreased blood pressure

Depressants Effects on the Body

* Low doses increase relaxation
* Low doses decrease inhibitions
* High doses can induce sleep
* High dose can cause motor disturbance
* High dose can cause memory loss
* High dose can cause decreased respiratory function, and death

Effects of Depressants when Used

Depressants, such as alcohol, barbiturates, and benzodiazepines, function as agonists of the gamma-Aminobutyric acid (GABA) neurotransmitter system, producing a quieting effect on the brain. Their primary site of action is the GABA-gated chloride (Cl–) channel, which has multiple distinct receptor sites. These sites can bind not only to depressant drugs but also to GABA itself and to neurosteroids.

Depressants Mechanism of Action

Repeated use of central nervous system depressants, such as alcohol, can lead to physical dependence, which manifests as tolerance and withdrawal symptoms. Psychological dependence on these substances can also develop, contributing to their high potential for abuse.

Dependence and Abuse Potential of Depressants

Read the following scenario. Based on the observed effects, identify the most likely class of psychoactive substance involved and explain its fundamental effect on the central nervous system.

Symptom Analysis of Psychoactive Substance Use

Analyze the likely combined effect of the medication and alcohol on the patient's body. Explain the underlying physiological reason for this outcome and identify the most critical potential danger.

Learn Before

Related

Learn After