Validation and standardization of the Brazilian version of the Medication Regimen Complexity Index for older adults in primary care.

Aim: To validate and standardize the Brazilian version of the Medication Regimen Complexity Index (MRCI) for older adults in primary healthcare.

Methods: A cross-sectional methodological study was carried out with elderly patients attending primary healthcare centers in southeastern Brazil. Convergent validity was tested by correlating MRCI scores with medication number.