This document discusses medical errors and medication errors. It defines medical errors as failures of planned actions or use of wrong plans that lead to patient harm. Medication errors are defined as preventable events involving medication use that may cause patient harm. The document notes that medical errors are the eighth leading cause of death in Pakistan, with around 7,000 deaths per year due to medication errors alone. Causes of medication errors discussed include errors of omission, errors of commission, communication failures, and failure to follow policies. The Swiss cheese model of layered defenses is presented as a way to understand how latent errors in the system can combine to cause patient harm. Types of medication errors like prescribing, dispensing, and administration errors are explained. Steps