methylxanthines

meth·yl·xan·thines

(meth'il-zan'thinz),
A chemical group of drugs derived from xanthine (a purine derivative); members of the group include theophylline, caffeine, and theobromine.

methylxanthines

a group of alkaloids that includes caffeine and related substances. Ingested caffeine is rapidly metabolized in the liver to three dimethylxanthines: paraxanthine, theophylline and theobromine; these are released in the plasma and remain in the circulation while caffeine concentration declines. As caffeine and its metabolites are often present at the same time, it is difficult to resolve which tissues are directly or indirectly affected by which compound.
References in periodicals archive ?
About energy drinks Energy drinks are a category of non-alcoholic beverages that contain stimulants such as caffeine in combination with numerous other ingredients such as taurine, methylxanthines, amino acids, herbal extracts, and vitamin B, which provide consumers with an energy boost.
The thermogenic and fat-oxidizing potential of varied bioactive food ingredients such as methylxanthines, polyphenols, capsaicinoids/capsinoids, minerals, proteins/ amino acids, carbohydrates/sugars and fats/fatty acids have been recognized.
Unlike other methylxanthines, dexofylline has no side effects on gastrointestinal tract, nervous system, heart and kidney.
Theophylline, theobromine and caffeine existing in tea are among the type of methylxanthines that are found in almost all types of teas.
Concomitant medication being considered to influence bronchial asthma was not permitted in the trial (leukotriene antagonists, anticholinergics, long acting beta agonists, beta blockers, methylxanthines, anti-IgE treatment, cromoglycin sodium/nedocromil sodium).
This is full of anti-ageing antioxidants and contains methylxanthines that boost metabolism, help burn fat more rapidly, especially around the stomach, and also lowers cholesterol.
Chocolate or public enemy number one contains methylxanthines, which eaten by your pets can spell disaster.
Controllers comprise a number of classes of medications, including inhaled corticosteroids, inhaled long-acting beta-agonists, oral long-acting beta-agonists, leukotriene receptor antagonists, methylxanthines, and nonsteroidal anti-allergy agents and combinations of these medications.
Methylxanthines, phenolic composition, and antioxidant activity of bark from residues from mate tree harvesting (Ilex paraguariensis A.
Coffee is a bronchodilator as well as a liver detoxifier arid contains the methylxanthines, theophylline, theobromine, and caffeine and stimulates xanthine oxidase, a P450 liver enzyme, that induces many detoxification enzymes in the liver as well as glutathione transferase.
Another particularly salient consideration is the correlation between the use of prescription and illegal drugs and the use of other psychoactive substances, such as nicotine, caffeine, alcohol, and so-called "energy drinks" (nonalcoholic beverages that are purported to improve cognitive or physical performance, mostly containing methylxanthines, taurine and B vitamins).
The purported diuretic effects of methylxanthines - caffeine in coffee, tea, and soft drinks; theophylline in tea and theobromine in tea, chocolate, and cocoa have been recognised for more than 75 years, which has prompted dieticians, clinicians, and exercise physiologists to denounce the use of caffeine in books and government reports.