Prescriptions with potential drug interactions dispensed at Swedish pharmacies in January 1999: cross sectional study

In this paper by Juan Merlo and colleagues (25 August, pp 427-8) we mistakenly omitted from the figure legend the number of possible drug interaction pairs. The legend should have read: “Prevalence of potential drug interaction subtypes34 among the 191 899 possible drug interaction pairs found in the 962 013 prescriptions containing two or more drugs dispensed to patients aged 15-95 from Swedish pharmacies in January 1999.”