http://buyorganiccoffee.org/1714/how-much-coffee-will-kill-you/
How Much Coffee Will Kill You?
We have written a lot about healthy organic coffee and the health benefits of coffee in general. There are a lot of good reasons to drink coffee and it turns out that many of those benefits increase as you drink more cups each day. However, caffeine is a stimulant that can give you the shakes if you consume too much. Like most substances there is a limit to how much is good and when it turns bad. So, how much coffee will kill you? Let’s start with what the Mayo Clinic says about how much coffee is too much.
Using caffeine to mask sleep deprivation can create an unwelcome cycle. For example, you may drink caffeinated beverages because you have trouble staying awake during the day. But the caffeine keeps you from falling asleep at night, shortening the length of time you sleep.
And some medications like the antibiotics ciprofloxacin and norfloxacin interact with caffeine and interfere with its breakdown in the body. The anti-asthma drug theophylline will build up in your system because caffeine interferes with its breakdown. And if you drink coffee and use the herbal supplement Echinacea your caffeine level will build up.
But, aside from when to drink coffee and use these substances how much coffee is enough and how much is too much. 400 milligrams of caffeine, about the amount in four cups of brewed coffee is OK for most adults but adolescents should consume only a fourth this amount. If you drink too much these things happen:
Insomnia
Nervousness
Restlessness
Irritability
Stomach upset
Fast heartbeat
Muscle tremors
But how much coffee will kill you? Popular Science reports on the death of a 14-year-old and discusses how much caffeine would it take to kill you.