Comparison of two Different Methods (Patient Questionnaire and Medication Possession Ratio - MPR) for Measuring the Chronic Patient's Behavior.

Background: Medication adherence is the extent to which patients take medications as prescribed by their health care providers. There are a number of approaches to study medication-taking behavior. The aim was to compare two most common methods for measuring adherence: Patient Adherence Questionnaire and Medication Possession Ratio (MPR).