ABSTRACT
OBJECTIVE: To estimate and compare type 2 diabetes mellitus treatment costs in insulin-naive patients following initiation of therapy with either insulin glargine (IG) or insulin detemir (ID) over 1-year time horizon from a payers' perspective in Argentina. METHODS: We used a pharmacoeconomic model based on a randomized trial comparing IG and ID (Rosenstock J, Davies M, Home PD, et al. A randomised, 52-week, treat-to-target trial comparing insulin detemir with insulin glargine when administered as add-on to glucose-lowering drugs in insulin-naive people with type 2 diabetes. Diabetologia 2008;51:408-16) and Argentinean sources. Clinical, resource use, and cost data were combined to estimate direct medical costs (insulin, test strips, and needles) during the first year. Price per international unit of insulin is similar for IG and ID in the local market. Deterministic analysis was performed on insulin unit cost and probabilistic sensitivity analyses on clinical, resource use, and unit costs to evaluate contribution to variance on the difference in total annual treatment cost. RESULTS: Annual mean treatment cost (Argentinean pesos 2013) was AR $6229 for IG and AR $9257 for ID, showing 33% total cost reduction with IG (AR $3028; exchange rate US $1.00 = AR $5.30). Probabilistic sensitivity analysis showed that IG was cost saving in 88% of the simulations. The most influential parameter was the difference in insulin dose requirements. Threshold analysis showed that if the unit price of ID is reduced by 43%, ceteris paribus, the total annual costs per person for both insulin regimens would be the same. CONCLUSIONS: From a payer's perspective in Argentina, cost savings related to the use of IG represented one third of total treatment costs. Sensitivity analyses confirmed the robustness of these results.
