Upper respiratory tract infection (URTI) is the most common problem managed by GP registrars. Antibiotic resistance is a major public health threat and current evidence-based guidelines do not recommend the use of antibiotics for simple URTIs and sore throat. However, Australian GPs issued over 2 million antibiotic prescriptions for URTI in 2011 (with antibiotics being prescribed in 32% of URTI presentations). Supervisors can play a key role in reducing unnecessary antibiotic prescription by appropriate supervision and role modelling.