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.
Not everyone with post-concussion syndrome will have all of the symptoms mentioned above. In general, for most people, symptoms of post-concussion syndrome only last for up to a few weeks. But for some people, the symptoms last longer and can last for three to six months or (rarely) a year or more.