This study focuses on retail brand extension from the consumer perspective when non-traditional products – in this case over-the-counter pharmaceuticals - are offered with the private label brand. A model in which attitude towards the extension (ATE) mediates the impact of some antecedents - national brand preference (NBP), trust towards the retailer (T), fit (FIT), private label knowledge (PLK) and consumer innovativeness (INN) - impacting the intention to purchase the extended PL brand (INTB) is proposed and tested. Direct effects regarding NBP and FIT are tested too. 500 questionnaires were collected from a sample of retail customers. Structural equation modeling serves to test the hypotheses. The model shows a good fit and the hypotheses are supported – except for INN.