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.
There are three main categories of concussions. The first is often seen with a knockout in boxing when the loss of consciousness is brief and usually lasting only 8-10 seconds. The second and more severe classification is when consciousness is lost for less than 6 hours as is sometimes the case in automobile accidents.