purchasing planning and order allocation in the pharmaceutical sustainable supply chain using the theoretical-graph (gt-mp- dm) (case study: supplying the clotting factor for patients with hemophilia)

In view of the growing environmental consciousness among product users, the issue of product sustainability is one of the challenging tasks being faced by product designers, manufacturers, environmentalists, and decision makers. this article presents a framework for supplier selection from a sustainability perspective. along with the sustainability criteria, the other criteria and sub-criteria involved in the selection of drug suppliers for patients with hemophilia are investigated, too. regarding the significance of the clotting agents in the health and life of hemophilia patients, it is especially important to provide and supply this drug from the safe companies and to consider the amount of ordering. the criteria and sub-criteria studied in this article were investigated and concluded through library studies, filed assessments of the experts’ comments. for the case study, the desired supplier is determined and the others are ranked through the graph theoretical matrix permanent decision making (gt-mp-dm) approach. finally, with presenting the bi-objective mathematical model, the amount of order to the suppliers is determined and then the model is solved by means of fuzzy max-min method and gams software; the model is validated by sensitivity analysis.