A person can die from an overdose very quickly, which is why it is necessary for anyone who has overdosed to seek medical treatment immediately. An overdose occurs when a large amount of drugs have been ingested. The effects can occur in a matter of hours. A person may become unresponsive, may begin vomiting, or show other signs of an overdose. If a person is overdosing, going to a hospital is absolutely necessary to prevent death or destruction of vital organs. A hospital can pump the stomach to remove the drugs and perform other procedures to prevent a death by overdose.