Static electricity is a form of electricity and when discharging it consists of an electrical current. Usually this electrical current is small(smaller than 1mA). It is low in potential harmful energy but it is high in Voltage, usually some kilovolts. The effects of static electricity normally are considered to be more annoying than being dangerous but for sure it can be harmfull to people. More detailed information about the dangers of static electricity and electricity in general on the body can be found here.