The methodological issues in multina- tional price comparisons and results re- ported were the principal focus of this review. As seen in the reviewed litera- ture, drug price comparisons differed mostly due to the methodology that was used to assess the data. For example, many researchers used different eco- nomic parameters, ones they believed were best suited for conducting their research. However, such discrepancies may cause the data found within differ- ent studies to become heterogeneous. In 1993, Andersson published a method- ological approach to comparing prices accurately (1). This procedure, however, was intended primarily for policymak- ers to set socially correct prices that would compare equally with countries that had similar policies and economies. With a general price comparison