Does green tea have negative effects?

Green Tea: Green tea is perhaps used by a billion people a day. It is a common beverage used daily in many cultures of the world. The myth that it helps with weight loss is a false myth.

Green tea: Overdose of Green Tea (usually extract) may lead to irritability, insomnia, irregular or rapid heart rate, muscle twitching, nausea, vomiting, diarrhea, abdominal cramps, liver damage, trouble breathing, dizziness, fever, confusion, hallucinations, diuresis, seizures, loss of consciousness & even death. Green tea is reported to have possible interactions w anticoagulants, stimulants, oral -