1 The scientific name for caffeine is 1,3,7-trimethylxanthine. 2  Caffeine is considered to be the most commonly used psychoactive drug in the world. 3  Coffee, soda, and tea are the most common sources of caffeine in the American diet.  Discontinuation of regular caffeine use may produce withdrawal symptoms.
For most patients, post concussion symptoms go away within a few days to several weeks after the original injury occurs.[In others, symptoms may remain for three to six months.In a small percentage of patients, symptoms may persist for years or may be permanent.
Studies of traumatic brain injury cases show that less than 3% experienced no memory loss at all. In 6% of cases, post-traumatic amnesia lasted for less than an hour; 7% experienced memory loss from an hour to a day; 16% between a day and a week; 23% between a week and a month; and 45% experienced amnesia for longer than a month.