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Medical errors

A medical error is an unexpected and undesired event (adverse event) that results directly from the health care or services you receive but which could have been prevented.

Errors may happen when a health professional fails to complete a planned action or treatment as it was intended, or uses an incorrect plan for an action or treatment, such as giving a patient the wrong medicine or dose or giving someone a medicine they are allergic to. Errors can also happen when medical equipment or devices are used incorrectly. Errors may also happen when medical equipment or devices fail. Adverse events, whether due to a medical error or not, are not complications of disease or expected side effects of medicines or other treatments. An adverse event may result in injury or death.

Author Jeannette Curtis
Author Caroline Rea, RN, BS, MS
Editor Kathleen M. Ariss, MS
Editor Susan Van Houten, RN, BSN, MBA
Associate Editor Tracy Landauer
Associate Editor Pat Truman
Primary Medical Reviewer Patrice Burgess, MD
- Family Medicine
Primary Medical Reviewer Adam Husney, MD
- Family Medicine
Primary Medical Reviewer Kathleen Romito, MD
- Family Medicine
Last Updated May 25, 2007

WebMD Medical Reference from Healthwise

Last Updated: May 25, 2007
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.