The Mayo Clinic wrote in a Dec. 26, 2006 article posted on its website, titled "Taking Performance-enhancing Drugs: Are You Risking Your Health?":
"Stimulants are drugs that can reduce fatigue, suppress appetite, and increase alertness and aggressiveness. They stimulate the central nervous system, increasing your heart rate, blood pressure, body temperature and metabolism.
The most common stimulants include caffeine and amphetamines (Dexedrine, Benzedrine). Cold remedies often contain the stimulants ephedrine, pseudoephedrine hydrochloride (Sudafed) and phenylpropanolamine. Street drugs such as cocaine and methamphetamine also belong to this group."
The National Institute on Drug Abuse (NIDA) stated in an article titled "Research Report Series - Prescription Drugs: Abuse and Addiction" posted on its website (accessed Oct. 13, 2008):
"As the name suggests, stimulants increase alertness, attention, and energy, as well as elevate blood pressure and increase heart rate and respiration. Stimulants historically were used to treat asthma and other respiratory problems, obesity, neurological disorders, and a variety of other ailments."