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咖啡因、茶碱和可可碱均为黄嘌呤衍生物。每天有无数的人应用咖啡因,无容置疑是其具有刺激作用。咖啡中含有1～2%的咖啡因,除去咖啡因的咖啡仍含0.3%的咖啡因。巧克力、茶及含可乐味的饮料含有较少比例的咖啡因。摄入咖啡因后约99%经胃肠道吸收,血浆峰值在15～45分钟,成人半衰期在3～7.5小时。作者报道1例48岁的妇女,12年前患过全身发疹,持续2年,诊断为慢性特发性荨麻疹。直到病人发觉发疹与饮用咖啡有关,以及被禁用咖啡、茶
Caffeine, theophylline and theobromine are xanthine derivatives. There are countless people who use caffeine every day, no doubt that it has a stimulating effect. Coffee contains 1 to 2% caffeine, decaffeinated coffee still contains 0.3% caffeine. Chocolate, tea and cola flavored beverages contain a small percentage of caffeine. About 99% of the intake of caffeine by the gastrointestinal tract, the peak plasma in 15 to 45 minutes, adult half-life of 3 to 7.5 hours. The authors report a 48-year-old woman who developed systemic rashes 12 years earlier for 2 years and was diagnosed with chronic idiopathic urticaria. Until the patient found that the rash was related to drinking coffee, and coffee and tea were banned