depressant

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depressant,

any one of various substances that diminish functional activity, usually by depressing the nervous systemnervous system,
network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually all members of the animal kingdom have at least a rudimentary nervous system.
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. Barbituratesbarbiturate
, any one of a group of drugs that act as depressants on the central nervous system. High doses depress both nerve and muscle activity and inhibit oxygen consumption in the tissues. In low doses barbiturates act as sedatives, i.e.
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, sedativessedative,
any of a variety of drugs that relieve anxiety. Most sedatives act as mild depressants of the nervous system, lessening general nervous activity or reducing the irritability or activity of a specific organ.
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, alcohol, and meprobamatemeprobamate
, tranquilizing drug that acts as a depressant of the central nervous system and is commonly used in the treatment of anxiety and sometimes schizophrenia. Although meprobamate is chemically unlike barbiturates and has lower toxicity, it has similar pharmacological
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 are all depressants. Depressants have various modes of action and effects. Some are primarily used medically to relieve emotion stress, anxiety, and tension; others induce sleep, and still others are used to relieve pain. Depressants also reduce the rate and force of contraction of the heart and are used in the treatment of some forms of heart diseaseheart disease,
any of several abnormalities of the heart and its function in maintaining blood circulation. Heart disease is the cause of approximately half the deaths in the United States each year.
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. Many depressants can induce psychological dependence and addiction (see drug addiction and drug abusedrug addiction and drug abuse,
chronic or habitual use of any chemical substance to alter states of body or mind for other than medically warranted purposes. Traditional definitions of addiction, with their criteria of physical dependence and withdrawal (and often an underlying
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). Typically, overdosage results in confusion, coma, and convulsions. In many cases, the effects of one depressant are intensified if another depressant is taken at the same time, e.g., if barbiturates are taken with alcohol. Because of their potential for abuse, there are now strict regulations regarding the dispensing of many depressant drugs.

depressant

1. Med able to diminish or reduce nervous or functional activity
2. a depressant drug
References in periodicals archive ?
Recently, our research group has studied EOs and their isolated compounds, focusing on the development of CNS depressants with fewer side effects (7,8,11).
However, concomitant use of alprazolam, with other CNS depressants such as alcohol and opioid analgesics, could have an additive CNS depression effect and lead to severe toxicity or even death.
The first group is made up of drugs which reduce brain activity, termed CNS depressants; the second group of drugs is made up of those which act increasing brain activity, termed CNS stimulators; and a third group is made up of those drugs which act by qualitatively modifying brain activity, being termed hallucinogens.
Always home.' Furthermore, as long-term use of CNS depressants has a tendency to suppress REM-sleep, dreams tend to creep into the waking state.
It is possible that other CNS depressants or psychotropic medications may exert similar effects on nighttime arousals as Zolpidem did in this study.
Drugs that cause central nervous system depression (CNS depressants), including controlled substances are among drugs that would be cause for concern if found in specimens from a nurse while on duty or subject to call, regardless of if the nurse exhibited impaired behavior.
It can interact with CNS depressants and stimulants, and tolerance often develops.
Part III is divided into 13 chapters covering Alcohol, CNS Depressants, Opioids, Cocaine, Marijuana, Amphetamines/Sympathomimetic Amines, Hallucinogens, Anticonvulsant and Antiarrhythmic Drugs, Antidepressant Drugs, Neuroleptic Drugs, Carbon Monoxide/ Cyanide, Inhalants, and Metals.
Mixed with opioid painkillers such us OxyContin and Vicodin, or CNS depressants such as Valium and Xanax, alcohol can slow breathing, causing respiratory failure and death.