Caffeine in serum

Caffeine is a purine alkaloid naturally found in the The leaves of the tea plant, Paraguayan holly Mate, coffee and cocoa seeds, and in other plants. Caffeine is adenylyl receptor antagonist, has a stimulating effect on the central nervous system, causes acceleration of heart rate, dilation of blood vessels and increases dopamine activity The most common sources of caffeine are coffee and tea When consumed in moderate amounts, caffeine improves mood and concentration, and removes fatigue. An overdose of caffeine can carry serious consequences such as severe stimulation psychomotor agitation, accelerated heart rate, increased diuresis, nausea, vomiting or weakness.