A medical error is a preventable adverse effect of care, whether or not it is evident or harmful to the patient. This might include an inaccurate or incomplete diagnosis or treatment of a disease, injury, syndrome, behavior, infection, or other ailment. Causes of medication error may include difficulty in reading handwritten orders, confusion about different drugs with similar names, and lack of information about a patients drug allergies or sensitivities. Medication errors can be classified, invoking psychological theory, as knowledge-based mistakes, rule-based mistakes, action-based slips, and memory-based lapses. Pharmacovigilance and Pharmacoepidemiology Journal offer a stage in Pharmacoepidemiology Researches and related subjects. Journal accepts leading forefront original research papers, review manuscripts, case reports and commentary in the field. Our target audience, readers and contributors are worldwide.