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Theophylline, also known as dimethylxanthine, is a methylxanthine drug used in therapy for respiratory diseases such as COPD or asthma under a variety of brand names. Due to its numerous side effects, these drugs are now rarely used clinically. As a member of the xanthine family, it bears structural and pharmacological similarity to caffeine. It is naturally found in tea, although in trace quantities (~1mg/l), significantly less than therapeutic doses.
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Theophylline /the·oph·yl·line/ a xanthine derivative found in tea leaves and prepared synthetically; its salts and derivatives act as smooth muscle [more]Asmalix - Community and Resources