• In moderate doses (150-250mg) caffeine counters drowsiness, and fatigue.
• It can help prevent boredom and tiredness interfering with performance on manual and mental tasks.
• Larger doses can sometimes impair performance. There may also be increased levels of alertness and anxiety.
• Can increase heart rate and blood pressure, even breathing.
  
  The Risks:
  
  
• Consuming 500-600mg of caffeine per day (roughly 7 cups of instant coffee) is considered excessive, and can have adverse effects.
• Increases sensitivity and sensor, disturbances (ringing in the ears or light flushes).
• Insomnia, muscle tremor, nausea, and diarrhoea may result.
• Caffeine can aggravate high blood pressure, and ulcers.
• Largely psychological dependence may arise in cases of heavy, long-term use.
• Tolerance can develop, while cutting out regular intakes of caffeine can lead to users feeling less alert, more drowsy and irritable.
• Regular drinkers may feel fatigued if they miss out coffee from their usual routine.
• Death from overdose is possible, but would take 100 cups of coffee.
  
  The Law:
  
  
• Caffeinated drinks and caffeine pills (such as ProPlus) are sold without restriction.
  
  

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