theophylline

theophylline
An alkaloid found with caffeine in tea leaves (commercial t. is prepared synthetically); a smooth muscle relaxant, diuretic, cardiac stimulant, and vasodilator; used in bronchial asthma and other forms of chronic obstructive pulmonary disease as a bronchodilator and respiratory muscle stimulant. Also, thought to increase respiratory drive, so sometimes used in hypoventilation syndromes. Shares chemical and pharmacologic properties with caffeine and theobromine.
- t. sodium glycinate equilibrium mixture containing t. sodium and glycine in approximately molecular proportions, buffered with an additional mole of glycine; similar in action and uses to aminophylline but more stable in air, and less irritating to the gastric mucosa.

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the·oph·yl·line thē-'äf-ə-lən n a feebly basic bitter crystalline compound C7H8N4O2 that is present in small amounts in tea but is prepared chiefly by synthesis, that is isomeric with theobromine, and that is used in medicine often in the form of derivatives or in combination with other drugs esp. as a bronchodilator to relieve or prevent symptoms of asthma and bronchospasm associated with chronic bronchitis and emphysema

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n.
an alkaloid, occurring in the leaves of the tea plant, that has a diuretic effect and relaxes smooth muscles, especially of the bronchi. Theophylline preparations, particularly aminophylline, are used mainly to control bronchial asthma. Trade names: Nuelin, Slo-Phyllin, Theo-Dur, Uniphyllin Continus.

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the·oph·yl·line (the-ofґə-lin) [USP] a methylxanthine compound occurring in tea leaves and prepared synthetically; theophylline, its salts, and its derivatives act as smooth muscle relaxants, central nervous system and cardiac muscle stimulants, and bronchodilators. Used as a bronchodilator in the prevention and treatment of symptoms of asthma and of reversible airway obstruction associated with chronic bronchitis, emphysema, or other chronic obstructive pulmonary disease; administered orally and intravenously.

Medical dictionary. 2011.

Look at other dictionaries:

  • Theophylline — Systematic (IUPAC) name 1 …   Wikipedia

  • Theophylline — Théophylline Théophylline Général Nom IUPAC …   Wikipédia en Français

  • Théophylline — Général Nom IUPAC …   Wikipédia en Français

  • théophylline — [ teɔfilin ] n. f. • 1889; de thé et gr. phullon « feuille » ♦ Biochim. Principal alcaloïde des feuilles de thé, obtenu également par synthèse. La théophylline est un diurétique, un vasodilatateur des coronaires et un dilatateur des bronches. ●… …   Encyclopédie Universelle

  • theophylline — [thē΄ə fil′ēn΄, thē΄ə fil′in] n. [< ModL thea, tea (infl. by Gr, goddess, as being a divine herb, but < source of TEA) + PHYLL + INE3] a colorless, crystalline alkaloid, C7H8N4O2·H2O, extracted from tea leaves or prepared synthetically: an… …   English World dictionary

  • theophylline — /thee euh fil een, in/, n. Pharm. a white, crystalline, poisonous alkaloid, C7H8N4O2, an isomer of theobromine, extracted from tea leaves or produced synthetically: used to relieve bronchial spasms, in the treatment of certain heart conditions,… …   Universalium

  • theophylline — n. an alkaloid, occurring in the leaves of the tea plant, that has a diuretic effect and relaxes smooth muscle, especially of the bronchi (it is an antimuscarinic drug). Theophylline preparations, particularly aminophylline, are used mainly as… …   The new mediacal dictionary

  • theophylline — teofilinas statusas T sritis chemija apibrėžtis alkaloidas formulė (CH₃)₂(O=)₂C₅H₂N₄ atitikmenys: angl. theophylline rus. теофиллин ryšiai: sinonimas – 1,3 dimetil 2,6 purindionas …   Chemijos terminų aiškinamasis žodynas

  • theophylline — noun Etymology: International Scientific Vocabulary theo (from New Latin thea tea) + phyll + 2 ine Date: circa 1894 a feebly basic bitter crystalline compound C7H8N4O2 present in tea leaves that is isomeric with theobromine and is used in… …   New Collegiate Dictionary

  • theophylline — (= 1,3 dimethylxanthine) Inhibits cAMP phosphodiesterase, and is often used in conjunction with exogenous dibutyryl cyclic AMP to raise cellular cAMP levels. Other, less potent, methylxanthines are caffeine, theobromine and aminophylline …   Dictionary of molecular biology

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