" Caffeine is a CNS stimulant belonging to class of methylxanthine and is the most commonly used psychoactive compound that works by reversibly blocking the action of adenosine. Caffeine is central sensory system stimulant of methylxanthine class. It is taken as psychoactive medications. This drug is intense, white crystalline purine in shading, and it is artificially identified with adenine and guanine bases of DNA. It can be found in seeds, nuts or the leaves of various plants local to South America and East Asia help with shielding these valuable plants from predators since creepy crawlies like the plant and through doing this, it keeps the germination to adjacent seeds. At times the drinks that have caffeine are ingested to mitigate tiredness and enhance execution. It is additionally utilized as beverages, whereby the caffeine beverages, for example, espresso, tea, and cola are utilized by the Americans. Caffeine can be both powerful and negative well-being impacts. For instance, it can treat and keep the develop recent child breathing issue; it can be exceptionally defensive in curing a few maladies like Parkinson sicknesses. "