[Rofecoxib versus non-steroidal anti-inflammatory drugs in arthrosis treatment: cost-effectiveness analysis for Spain]. / Rofecoxib frente a antiinflamatorios no esteroideos en el tratamiento de la artrosis: análisis coste-efectividad para España.

OBJECTIVE: Analyze the efficiency of non-selective non-steroidal anti-inflammatory drugs (NSAIDs) versus rofecoxib prescription for arthrosis treatment in Spain through a theoretical model of cost-effectiveness. METHODOLOGY: A theoretical model of decision that evaluates the efficiency of the use of non-selective NSAIDs and rofecoxib in the treatment of patients > 65 years with arthrosis who were nonrespondent to the administration of acetaminophen 4 g/day. The analysis focuses on the estimate of the impact derived from the gastrointestinal (GI) adverse effects. Two alternative analysis contexts are considered: "customary clinical practice" and "rational use of GI drugs" with possible preventive use of gastroprotective (GP) drugs in both groups. The time horizon is 1 year. Direct expenses are estimated from the Spanish Health System perspective. The effectiveness parameter used is the number of severe GI complications prevented. RESULTS: Under the assumptions of the first context, with a 55% estimated combinated prescription of non-selective GP with NSAID, and 6% with rofecoxib, the percentage of cost compensation of rofecoxib is 72%. Under the assumptions of the second context, the cost of rofecoxib is totally compensated when the percentage of combinated prescription of GP with NSAIDs is 59%. CONCLUSION: The use of rofecoxib can be a cost-effective alternative with regard to the traditional non-selective NSAID in the arthrosis treatment, especially in context of higher preventive use of CI drugs.