This helps you think more rapidly and clearly. Elsewhere in the body, blood vessels expand. Caffeine is used medically as a mild stimulant or headache-killer. Caffeine citrate helps in treating sleeping problems in newborns. In healthy people, moderate amounts of caffeine have little effect on blood pressure or heart rate.
Bigger doses can cause agitation and ringing in the ears, muscle tremors and irregular heartbeat.
If you quit coffee cold, you may experience headache, nervousness, anxiety dizziness and irritability. Remember, though, coffee isn't a drug. It's not primarily used to cure, relieve or prevent illness. Medicine Chest airs weekly on eight Kansas radio stations.