Side effects include increased blood pressure and heart rate, and it's highly addictive. When you're coming down from it you'll experience a strong desire for more, and the cycle will begin.
The ever useful
wiki.
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Cocaine abuse is associated with a lifetime risk of heart attack that is seven times that of non-users. During the hour after cocaine is used, heart attack risk rises 24-fold. It accounts for 25% of the heart attacks in the 18–45 year-old age group.
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I'm no doctor, so my advice means nothing (standard disclaimer), but don't get involved with this one, and if you really feel you must experiment, make it extremely casually. Do not start taking it regularly, it will take over your life. I've seen it happen.