<Emphasis Type="Bold">Objective: To estimate rates of non-adherence for statins following implementation of a preferred drug list (PDL). <Emphasis Type="Bold">Study design: A retrospective cohort study. <Emphasis Type="Bold">Methods: A difference-in-difference-in-difference approach was used to estimate the impact of a PDL on the use of statins in an Alabama...</emphasis></emphasis></emphasis>

Pharmaceutical manufacturers have increased the availability of their products and sometimes increased their own financial returns by charging lower prices outside of the US and by discounting to lower-income patients in the US. Examples include discounted HIV-AIDS drugs in developing countries...