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(US), anesthetic
a substance that causes anaesthesia



a substance that acts selectively on the central nervous system and induces a state of anesthesia.

The meaning of the term “anesthetic” has changed in the course of the development of pharmacology. Anesthetics used to include nervous-system depressants and stimulants, as well as many substances that only indirectly affect the nervous system. From the beginning of anesthetic practice, stimulants, depressants, and various indirectly acting substances were the principal anesthetics. Neurotropic agents with different types of action, for example, analgesic, somnifacient, and tranquilizing, are grouped separately. Application of the term “anesthetic” to denote substances of plant or synthetic origin that are narcotics—morphine, oxycodone, Trimeperidin. for instance—was determined by convention, as was the use of the term “narcotic” to convey the sense of “anesthetic.” The main requirements of an anesthetic are that it have broad action, that is, a significant range between the effective (anesthetic) and toxic doses; that it not produce complications; and that it have no aftereffects.

Anesthetics are classified as either inhalation or noninhalation, depending on the method of administration. Inhalation anesthetics are divided into volatile anesthetics, which include ethers, chloroform, trichloroethylene, halothane, and ethyl chloride, and into gaseous anesthetics, such as nitrous oxide and cyclopropane. Noninhalation anesthetics, for example, hexobarbital, sodium thiopental, and propanilid, are administered intravenously. Narcolan is introduced by rectum.

Often, a combination of anesthetics is used to weaken or completely compensate for any negative properties that one of the ingredients might have when used alone. Surgical procedures that involve certain physiological functions can require a combination of an anesthetic with other types of agents, such as muscle relaxants, antihistamines, cholinergic and adrenergic blocking agents, ganglioplegic agents, neuroleptics, and tranquilizers. A new kind of anesthesia has been developed, neuroleptoanalgesia, in which anesthesia is brought about using neuroleptics and analgesics without the use of anesthetics.


Zakusov, V. V. Farmakologiia nervnoi sistemy. Leningrad, 1953.


What does it mean when you dream about an anesthetic?

To dream of being anaesthetized may represent the residue of a memory (e.g., from a medical operation). It could also reflect a desire to be relieved of some painful experience—physical, mental, or emotional.


A drug, such as ether, that produces loss of sensibility.
References in periodicals archive ?
If seizures were still not controlled within 24 hours of starting KE then anesthetic agents were used including thiopental and propofol and patients were intubated and mechanically ventilated if required.
Although this agent has strong analgesic potency strength, it is a weak anesthetic agent and may be insufficient in patients with high anxiety levels.
Those anesthetic agents depending on the animal's size (body weight) and procedure (intramuscular injections), MS-222, isobutyl alcohol, and intramuscular (IM) injections of lidocaine, ketamine, or xylazine have been reported (Oswald 1977, Brown et al.
In first experiment propofol was employed as sole anesthetic agent in experimental horses.
The first most effective, safe and reliable intravenous anesthetic agent was thiopentone sodium.
Propofol and methohexital as anesthetic agents for electroconvulsive therapy: a randomized, double-blind comparison of electroconvulsive therapy seizure quality, therapeutic efficacy, and cognitive performance.
This dose of shortest induction and recovery times is recommended as the most appropriate amounts for an effective sedative and anesthetic agent in economic terms for aquaculture activities, such as handling, catching with net, transporting to another tank, etc.
A VOLUME REFLECTOR[R] that replaces traditional bag-in-bottle and piston designs, and allows partial re-breathing of exhaled gases, has a small system volume with no moving parts, and delivers uninterrupted ventilation for a fast wash-in and wash-out of anesthetic agent.
The objective of this study was to determine phenol red thread test (PRTT) values in eyes of clinically normal Hispaniolan Amazon parrots before and after topical application of an ophthalmic anesthetic agent and compare findings with Schirmer tear test (STT) values.
Anesthesia is a broad discipline; for orthopaedic applications, the type and location of the planned orthopaedic procedure is important in the selection of the most appropriate anesthetic agent and technique.
Women who scored higher for depression on the Beck Depression Inventory-Second Edition (BDI-II), or who were more pessimistic about their current medical diagnosis as measured by the Future Pessimism Scale of the Millon Behavioral Medicine Diagnostic, were more sensitive to a standardized dose of an anesthetic agent during anesthesia induction, Dr.
This article will review safety and effectiveness of articaine, an anesthetic agent recently introduced in the United States for consideration as part of their pain control armamentarium.