Induces clearer thought, less drowsiness. Shortens reaction time, increases motor activity and reflex excitability. Increases rate and force of the heart s contractions. Produces vasodilation of systemic blood vessels and vasoconstriction of blood vessels in the brain. Speeds up production of urine.
Caffeinism is a stimulated condition of chronic poisoning due to over-indulgence of caffeine.
Caffeine dependence and tolerance. Caffeine and birth defects. Colorectal cancer and long term, heavy coffee users linked. Possible association between coffee consumption and heart attack, increased levels of blood cholesterol. Guidelines for defense against caffeine.