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How Caffeine Affects the Body. Caffeine stimulates heart rate through a well documented process in the cardiac cells. Caffeine blocks the enzyme phosphodiesterace, which normally actviates production of an enzyme, cyclic AMP (cAMP), which initates a protein that increases heart rate.s for heart rate, caffeine is a central nervous system stimulant. It is in a class with other psychoactive drugs like epinephrine, amphetamines, cocaine, Ecstacy, nicotine and other ADHD medications like Ritalin. It is one of the few psychoactives that is legal.
Adderall -- a brand of amphetamine salts -- is a central nervous stimulant, or CNS. It is used in the treatment of attention deficit hyperactivity disorder, also known as ADHD. Caffeine is a naturally occurring substance found in a variety of plants, such as coca pod, cola nut and guarana.ndividually, caffeine and Adderall adversely affect the heart. They both increase your heart rate. According the prescribing information for Adderall, your heart rate is potentially increased by about three to six beats per minute when you take it.