Inappropriate pharmacotherapy is common and is an important cause of harm to patients. The incidence of preventable adverse drug events is high worldwide, with rates ranging from 16.5 to 52.9%. [1][2][3] It is also estimated that 70% of preventable adverse drug events are due to inappropriate prescribing. 4,5 Junior doctors working in secondary care, who write out most prescriptions in hospital, prescribe incorrectly in 8-10% of cases, sometimes with fatal consequences. 6,7 One reason for these errors is that junior doctors tend to base their drug choices on examples learned from their medical teachers instead of on their own autonomous therapeutic reasoning. 8 Moreover, junior doctors themselves do not feel well prepared to prescribe after graduation,