Caffeine is defined as a drug because it stimulates the central nervous system.
Review Date: Thursday, October 30, 2014
The Nemours Foundation
Do you know the caffeine content of your favorite beverages? Take a closer look at how much caffeine you consume in a typical day, especially if you are bothered by headaches, restlessness or anxiety.
Review Date: Wednesday, November 26, 2014
Mayo Foundation for Medical Education and Research
For most people, moderate doses of caffeine — 200 to 300 milligrams (mg), or about two to four cups of brewed coffee a day — aren't harmful. But some circumstances may warrant limiting or even ending your caffeine routine. Read on to see if any of these apply to you.
Review Date: Wednesday, November 26, 2014
Mayo Foundation for Medical Education and Research