Talk:Theophylline

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Pharmacology High‑importance

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Ideal sources for Wikipedia's health content are defined in the guideline Wikipedia:Identifying reliable sources (medicine) and are typically review articles. Here are links to possibly useful sources of information about Theophylline.

PubMed provides review articles from the past five years (limit to free review articles)
The TRIP database provides clinical publications about evidence-based medicine.
Other potential sources include: Centre for Reviews and Dissemination and CDC

Is theophyline naturally derived

Is theophyline naturally derived from plant sources, or is it synthesized in test tube?
- Both. There's no difference between natural and artificial theophylline - they're 100% exactly the same.12:12, 10 Nov 2004 (UTC)

What is a "positive inotropic effect" and a "positive chronotropic effect"? Does that mean increase or decrease in either? Using the links doesn't help.
- positive inotropic effect -> it increases heart muscle contractility and efficiency
- positive chronotropic effect -> it increases the heart rate.
- The links will be even less help when they're moved to Wiktionary! - Nunh-huh 15:33, 24 Mar 2005 (UTC)

What amount of theophylline is there in a cup of black tea? Is there any in coffee?

Correction: Ratio of Metabolized Substances

Caffeine is metabolized in the liver into three primary metabolites: 
paraxanthine (84%), theobromine (12%), and theophylline (4%) 
Reference: # ^ Caffeine. The Pharmacogenetics and Pharmacogenomics Knowledge Base.
Retrieved on 2006-08-14.

This reference is somewhat out of date. According to the same source [1], cross-referenced by Theobromine, the ratios listed in Caffeine are incorrect.

How safe is this?

Q:If theophylline is naturally occuring in green tea, than how much is occuring in a cup? What are the effects for someone on medication to this combination?

Hopefully someone else can answer the amount question. I don't know what you mean by the second one, but if you mean a combination of black tea and taking theophylline pills, then yes that could contribute to excess amounts and thus toxicity. - Taxman ^Talk 20:01, August 15, 2005 (UTC)

Q: What are the effects of infusing theophylline and guarna into the same concentrate?

Presumably you mean guarana which contains caffeine? No idea. Unless that's been studied it could have little to no interaction, or a significant adverse reaction. That's one of the big problems with homeopathic medicine, is the lack of information about their adverse reactions with other drugs. To answer your general question, Theophylline can be significantly toxic and as far as I know, it is generally a last resort type drug, only to be used when nothing else works or works well enough. At least here in the US that is. - Taxman ^Talk 20:01, August 15, 2005 (UTC)

That's actually the good thing about homeopathic "medicine" - the plant extract is diluted so far that no trace of the plant remains in the final product! So I reccomend the anon swig as much homeopathic theophylline and guarana as they wish ;) --129.11.249.164 (talk) 03:46, 2 May 2012 (UTC)[reply]

Taxman: An infusion or a concentrate can not be considered homeopathic because they contain conspicuous quantities of herbal extracts. Tea and/or guarana as medicine could be considered herbal medicine.

Theophylline and COPD

Recent research at Imperial College London under Prof Peter Barnes has demonstrated that low doses of theophylline raise the level of the enzyme HDAC2, which may then allow glucocorticoids to reduce lung inflamation, which they are not normally effective at with COPD patients. The doses used in the trials were much less than used when theophylline was once a commonly prescribed bronchodilator for COPD treatment.

Steroids are normally quite effective in COPD patients. Theophylline is still in fairly common use in patients refractory on short- and longterm bronchodilators and inhaled steroids. JFW | T@lk 17:08, 7 March 2006 (UTC)[reply]

"In chronic obstructive pulmonary disease (COPD) patients and asthmatic patients who smoke HDAC2 is markedly impaired as a result of oxidative and nitrative stress so that inflammation is resistant to the anti-inflammatory effects of corticosteroids." Barnes PJ, Eur J Pharmacol.2006 Mar 8;533(1-3):2-14. --Onefishtwofish 12:20, 2 July 2006 (UTC)[reply]

Bioavailability

Currently the article reads bioavaiability when administered intravenously is 100%. This is useless information, as bioavailability is the amount that reaches the bloodstream when administered. Anything administered intravenously has a bioavalability of 100%. — Preceding unsigned comment added by 130.102.10.116 (talk) 00:13, 16 October 2024 (UTC)[reply]

From the article: 'Bioavailability is 100%. However, taking the drug late in the evening may slow the absorption process, without affecting the bioavailability. Taking the drug after a meal high in fat content will also slow down the absorption process, without affecting the bioavailability. There is one exception. Taking UniphylTM, a long-acting theophylline formulation, after a meal high in fat content will increase its bioavailability.'

I am completely ignorant of what bioavailability means, but I'm guessing that it isn't supposed to exceed 100%, making this a rather curious statement, since it implies > 100% bioavailability w/ the use of some product. --anonymous, 31 March, 2008 —Preceding unsigned comment added by 75.172.48.115 (talk) 17:44, 31 March 2008 (UTC)[reply]

WikiProject Food and drink Tagging

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(Extra) Citation needed

How many references are needed to get the citations needed tag removed? To me the current number of references should do.T.vanschaik (talk) 18:12, 22 February 2012 (UTC)[reply]

I don't think there is any kind of rule. I agree with you that the current number of references is sufficient to remove the tag, so I have done so. -- Ed (Edgar181) 18:19, 22 February 2012 (UTC)[reply]

Current draft seems to unfairly compare concentration in dry cocoa beans by weight in mg/g with concentration in brewed tea by volume (diluted by water).

Current draft seems to unfairly compare

cocoa beans concentration by dry weight (mg/g) with

brewed tea concentration in volume (by liter) (i.e., diluted by water).

As a result, hot cocoa or other prepared foods containing cocoa diluted with water or other ingredients may be assumed to be better sources of theophylline than they are, and tea may be falsely assumed to be inferior by comparison, though it may not be.

Apples - to - apples comparison needed.

Reversing toxicity

I have had acute extreme tachycardia and elevated BP twice from accumulated cocoa, presumably due to theophylline toxicity, and both times it was reversed starting in 10 minutes and completely in 2 hours with 50 mg orally chewed atenolol. In other words, as the reference in the article says, cardioselective beta blockers do work. Note that a drug such as atenolol of course won't address any CNS issues. --IO Device (talk) 18:11, 11 July 2015 (UTC)[reply]

To add to article

Basic information to add to this article: the etymology of the word "theophylline." 173.88.246.138 (talk) 14:58, 19 April 2021 (UTC)[reply]

Done. sbelknap (talk) 04:41, 6 September 2023 (UTC)[reply]

"Dimethylxanthine" listed at Redirects for discussion

The redirect Dimethylxanthine has been listed at redirects for discussion to determine whether its use and function meets the redirect guidelines. Readers of this page are welcome to comment on this redirect at Wikipedia:Redirects for discussion/Log/2024 October 29 § Dimethylxanthine until a consensus is reached. 1234qwer 1234qwer 4 12:38, 29 October 2024 (UTC)[reply]