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8-Chlorotheophylline (1,3-dimethyl-8-chloroxanthine or 8-CTP) is a stimulant drug of the xanthine class that is closely related to caffeine in both its chemical structure and effects. It is mainly used as a wakefulness-promoting agent found within dimenhydrinate, where it counteracts the drowsiness effects present with diphenhydramine. 8-Chlorotheophylline can cause heart problems in people who take large doses of dimenhydrinate as both of the active ingredients in the drug, Diphenhydramine, and 8-Chlorotheophylline together can cause severe tachycardia.