stimulant, any substance that causes an increase in activity in various parts of the nervous system nervous 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.
..... Click the link for more information. or directly increases muscle activity. Cerebral, or psychic, stimulants act on the central nervous system and provide a temporary sense of alertness and well-being as well as relief from fatigue. Drugs such as caffeine caffeine , odorless, slightly bitter alkaloid found in coffee, tea, kola nuts (see cola), ilex plants (the source of the Latin American drink maté), and, in small amounts, in cocoa (see cacao). It can also be prepared synthetically from uric acid.
..... Click the link for more information. and the amphetamines amphetamine , any one of a group of drugs that are powerful central nervous system stimulants. Amphetamines have stimulating effects opposite to the effects of depressants such as alcohol, narcotics, and barbiturates.
..... Click the link for more information. belong in this category, and several groups of drugs chemically similar to antihistamines antihistamine , any one of a group of compounds having various chemical structures and characterized by the ability to antagonize the effects of histamine. Their principal use in medicine is in the control of allergies such as hay fever and hives.
..... Click the link for more information. and phenothiazines phenothiazine , any one of a class of drugs used to control mental disorders. Phenothiazines, along with other antipsychotic, or neuroleptic, drugs are used for such disorders as schizophrenia, paranoia, mania, psychosis resulting from mental deficiency, some forms
..... Click the link for more information. also act as mild psychic stimulants (see psychopharmacology psychopharmacology , in its broadest sense, the study of all pharmacological agents that affect mental and emotional functions. The term is usually applied more specifically to the study and synthesis of drugs used in the control of psychiatric illnesses, namely the
..... Click the link for more information. ). Cocaine cocaine , alkaloid drug derived from the leaves of the coca shrub. A commonly abused illegal drug, cocaine has limited medical uses, most often in surgical applications that take advantage of the fact that, in addition to its anesthetic effect, it constricts small
..... Click the link for more information. , besides its effect as a local anesthetic, also stimulates the central nervous system, producing excitement and erratic behavior. The hallucinogenic drugs hallucinogenic drug , any of a group of substances that alter consciousness; also called psychotomimetic (i.e., mimicking psychosis), mind-expanding, or psychedelic drug.
..... Click the link for more information. are also central nervous system stimulants.

A second class of stimulants that affect the medulla and spinal cord includes derivatives of niacinamide (nicotinic acid amide) and other chemically diverse compounds; they are sometimes used to speed the return to wakefulness after anesthesia anesthesia [Gr.,=insensibility], loss of sensation, especially that of pain, induced by drugs, especially as a means of facilitating safe surgical procedures.
..... Click the link for more information. or to counteract barbiturate poisoning. Ammonia, in smelling salts, is also a medullary stimulant; the alkaloid strychnine is a spinal-cord stimulant.

Other substances act mainly on the autonomic nervous system. Drugs that stimulate the parasympathetic portion of the autonomic nervous system, such as pilocarpine pilocarpine , naturally occurring alkaloid obtained from plants of the genus Pilocarpus (family Rutaceae). By mimicking the effects of acetylcholine, pilocarpine acts as a stimulant of the parasympathetic nervous system.
..... Click the link for more information. , physostigmine, and neostigmine neostigmine , drug used to mimic the effects of stimulation of the parasympathetic nervous system. Along with several other drugs that have a similar mode of action, it inhibits the action of the enzyme cholinesterase, which destroys the substance acetylcholine at
..... Click the link for more information. , cause contracted pupils, salivation and sweating, slowed heartbeat, and lowered blood pressure. Drugs such as norepinephrine, epinephrine epinephrine , hormone important to the body's metabolism, also known as adrenaline. Epinephrine, a catecholamine, together with norepinephrine, is secreted principally by the medulla of the adrenal gland.
..... Click the link for more information. , and other catecholamines catecholamine , any of several compounds occurring naturally in the body that serve as hormones or as neutrotransmitters in the sympathetic nervous system. The catecholamines include such compounds as epinephrine, or adrenaline, norepinephrine, and dopamine.
..... Click the link for more information. and synthetic analogs stimulate the sympathetic portion of the autonomic nervous system, resulting in dilated pupils, rapid heartbeat, and increased blood pressure. Because the sympathetic and parasympathetic systems have opposing physiological effects, stimulation of one system amounts to depression of the other. Some of the alkaloids from the ergot ergot , disease of rye and other cereals caused by the fungus Claviceps purpurea. The cottony, matlike body, or mycelium, of the fungus develops in the ovaries of the host plant; it eventually turns into a hard pink or purple body, the sclerotium, or ergot,
..... Click the link for more information. fungus act by direct stimulation of smooth muscle, inducing contractions in uterine and intestinal muscle.

stimulant

Any drug that excites any bodily function; usually one that stimulates the central nervous system, inducing alertness, elevated mood, wakefulness, increased speech and motor activity, and decreased appetite. Their mood-elevating effects make some stimulants (e.g., amphetamines, caffeine and its relatives, cocaine, nicotine) potent drugs of abuse (see drug addiction). Ritalin, prescribed for attention deficit disorder in children, is a mild stimulant.

stimulant

1. a drug or similar substance that increases physiological activity, esp of a particular organ

2. increasing physiological activity; stimulating

stimulant [′stim·yə·lənt]

(pharmacology)

A drug or agent that temporarily acts on muscles, nerves, or a sensory end organ, producing an increase in its state of activity.

Stimulant

a medicinal preparation used therapeutically to stimulate the sensory nerve endings of the skin and mucosa. The group of stimulants includes substances that are different in origin and chemical structure, for example, ammonia water and such volatile oils as oil of mustard, camphor, menthol, and oil of turpentine.

Stimulants are rubbed into or applied to the skin to weaken the inflammatory process in myositis, neuritis, and arthralgia. Bitters such as tincture of wormwood (absinthium tincture) and centaury are taken orally to stimulate the appetite. The receptors of the oral cavity perceive the sensation of the bitter taste of bitters, which induces a reflex intensification of the excitability of the feeding center and a subsequent increase in appetite. Steam from ammonia water irritates the sensory receptors of nasal mucosa, which causes a reflex intensification of the tone of the respiratory and vasomotor centers.

REFERENCES

Anichkov, S. V., and M. L. Belen’kii. Uchebnik farmakologii, 2nd ed. Leningrad, 1968.
Mashkovskii, M. D. Lekarstvennye sredstva, parts 1–2, 7th ed. Moscow, 1972.

V. V. CHURIUKANOV

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Stimulant (redirected from general stimulant)

stimulant

REFERENCES

Stimulant
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