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Caffeine is associated with few side effects:-
1. Excess caffeine can lead restlessness
, excitement, insomnia, flushing
of the face, increased urination, gastrointestinal disturbance, muscle twitching, a rambling flow of thought and speech, irritability, and irregular or rapid heart beat and anxiety.
2. It is also addictive. If you use it every day, you may be addicted.
can cause liver damage
if used in higher doses and for prolong time.
So get evaluated for cause of tired and sleepiness and use medicine according to cause, as advised by physician.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal