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.
Symptoms of concussions, such as confusion, blurred vision, headache, loss of memory, and, sometimes, loss of consciousness, can last anywhere from a few seconds to a few hours to a few days. This depends on the severity of the impact. Sometimes, concussions last just a few moments. Other times, a person can be unconscious (knocked out or passed out) for a couple of minutes or longer. Depending on the severity of the symptoms, concussions are grouped into 5 grades. In Grade 0 concussion, the symptoms include headache and difficulty in concentration.