The caffeine in
black tea can also speed up the nervous system. Drinking
black tea along with stimulant
drugs might cause serious problems including increased heart rate and high blood pressure. Avoid taking stimulant
drugs along with
black tea. Drinking too much black tea, such as more than five cups per day, is POSSIBLY UNSAFE. High amounts of black tea can cause side effects due to the caffeine in black tea. These side effects can range from mild to serious and include headache, nervousness, sleep problems, vomiting, diarrhea, irritability, irregular heartbeat, tremor, heartburn, dizziness, ringing in the ears, convulsions, and confusion. Also, people who drink black tea or other caffeinated beverages all the time, especially in large amounts, can develop psychological dependence. Drinking very high amounts of black tea containing more than 10 grams of caffeine is LIKELY UNSAFE.
