Medication /Drug errors can happen in hospital or out of hospital practice and are more frequent among the beginners starting with their health care practice. The untoward reactions can vary from mild to fatal. The common causes of Medication errors are miscommunication regarding drug dilution, route and speed of administration, confusion over similar looking labels on drug ampoules etc. We present here a case of drug error, who suffered cardiac arrest due to rapid intravenous injection of Vitamin K but revived with prompt cardiopulmonary resuscitation. He recovered fully, so as to undergo surgical closure of jejunostomy for which he was admitted. Drug error could be avoided with close loop communication, clear instruction and paying full attention to the drugs while administrating them to the patients. The health care workers should also have a clear understanding about the patient’s pathophysiology while giving medication.