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A chemical group of drugs derived from xanthine (a purine derivative); members of the group include theophylline, caffeine, and theobromine. ... (05 Mar 2000) ... 
Naturally occurring purine alkaloids such as theobromine, theophylline and caffeine (trimethyl-xanthine). They inhibit cAMP phosphodiesterase and thus cause an increase in the intracellular cAMP concentration.
Type: Term Pronunciation: meth′il-zan′thinz Definitions: 1. A chemical group of drugs derived from xanthine (a purine derivative); members of the group include theophylline, caffeine, and theobromine.