A medically induced coma is produced by an anesthetic, typically propofol, pentobarbital or thiopental, to cause a temporary coma or a deep state of unconsciousness. It is usually given to patient of brain injury with swelling that has not responded to other treatments. When the brain swells it can be life-threatening, as it can constrict blood supply and destroy additional brain tissue. When a patient is put in a medically induced coma or deep state of unconsciousness, the brain is able to rest and swelling is more likely to decrease. When swelling is relieved, pressure on the brain also reduces, hopefully preventing some or all brain damage from occurring. a patient’s critical life functions are constantly monitored by an anesthesiologist or other physician in a critical care setting only. So it is done in advantage of patient, so there is no question of any harm.