This document provides guidelines for reporting medication errors in Malaysia using the Medication Error Reporting System (MERS). The MERS allows healthcare professionals to register and submit error reports individually or centralized through facilities. Reporters can maintain and view their submitted reports, and generate data from the reports. The reporting and verification process involves the reporter submitting the report, a verifier approving or rejecting it, and the state and national Ministry of Health endorsing completed reports. User registration and report creation follow a multi-step online process through the MERS website.