The overview of a medication error and certain types of error that could cause patients medication plan to turn into a wrong way. Medication error also could lead to many other unwanted outcomes that could be harmful to patient. The types of medication errors that normally occur with its explanation are given. A potential error from the prescriber is explained and the error from the perspective of patient is also mentioned. There are certain steps that can be taken in order to overcome these medication errors and how a patient can react in order to overcome these medication errors. An example of a medication error case study is also presented with the discussion on the error.