Economic Evaluation of Nimesulide versus Diclofenac in the Treatment of Osteoarthritis in France, Italy and Spain Rosanna Tarricone, 1 Elisa Martelli, 1 Fabio Parazzini, 2 Josep Darbà, 3 Claude Le Pen 4 and Joan Rovira 5 1 CeRGAS – SDA – Bocconi University, Milan, Italy 2 University of Milan, Milan, Italy 3 Universitat de Barcelona, Barcelona, Spain 4 LEGOS, Université Paris-Dauphine et CLP-Santé, Paris, France 5 SOIKOS y Universitat de Barcelona, Barcelona, Spain Abstract Objective: To assess and compare the incremental costs of the 15-day treatment of osteoarthritis (OA) with nimesulide vs that with diclofenac in France, Italy and Spain. Design: A cost-minimisation analysis was performed through a decision tree, assuming the National Health System perspective. A meta-analysis was performed to assess the incidence of gastrointestinal adverse events (GIAEs) in patients with OA treated with nimesulide or diclofenac. Results: Three studies were included in the meta-analysis, which included a sample size of 484 patients in total. The incidence of GIAEs is higher in patients treated with diclofenac than in those treated with nimesulide. Nimesulide is cost-saving in all three countries: treatment costs are reduced by Euro dollars (EUR) 1.5 per case in France, EUR2 in Italy and EUR3.6 in Spain. Final results are not sensitive to variation of incidence rates of gastric and intestinal events and to changes in the resource consumption: nimesulide always remains cost- saving. Conclusions: This is the first economic analysis carried out in three different countries on original epidemiological data comparing nimesulide and diclofenac directly. Projecting our results to the estimated OA prevalence in the entire population of the three countries, the expected savings to the NHS would vary from a minimum of EUR17 500 000 in France to a maximum of EUR30 000 000 in Spain. It can be stated that these findings can provide support for clinicians and policy-makers for the adoption of this cost-saving treatment strategy in patients with OA. CLINICAL PHARMACOECONOMICS Clin Drug Invest 2001; 21 (7): 453-464 1173-2563/01/0007-0453/$22.00/0 © Adis International Limited. All rights reserved.