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.
The researchers used a concussion-symptom scale and found that patients who engaged in the most mental activity took about 100 days to completely recover, having no headaches, dizziness or blurred vision. For those who gave their brains time to heal, recovery time was cut to an average of 43 days, the study found. Study co-author Michael Collins is one of the developers and owners of the company that created and sells the concussion-assessment tool used in the study.