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.
Report Abuse. 1  Symptoms of concussion can last for up to a few weeks, sometimes even longer. Mostly they settle sooner than this, but 2 days isn't that long. 2  a concussion usually lasts up to 24 hours ... i think she should get herself a check-up.