Pharmacoeconomic assessment of oseltamivir in treating influenza - the case of otherwise healthy Danish adolescents and adults

Objective: To assess the pharmacoeconomics of treating influenza with oseltamivir in healthy Danish adolescents and adults. Method: Cost-effectiveness and cost-utility analyses were used to compare oseltamivir to usual care (symptomatic treatment with over the counter (OTC) medicine), considering both the societal and health care payer's perspectives. The population group studied was otherwise healthy adolescents and adults, aged 13 to 64. Danish data were collected to simulate results that are specific to Denmark. The economic model included first- and second-order Monte Carlo simulations. Sensitivity analyses were conducted to test the robustness of the analyses. Main outcome measure: The cost-effectiveness study was expressed as gain in cost per day to return to normal activity, and the cost-utility study as cost per QALY (quality adjusted life years) gained. Results: From a societal perspective, oseltamivir was a dominant treatment compared to usual care. From a health care payer's perspective, the cost-effectiveness ratio was 12.3 Euro per gain in day to return to normal activity and 5,063 Euro/QALY gained. A sensitivity analysis leaving out hospitalisation, complications, and mortality showed increased cost-effectiveness and cost-utility ratios, However, treatment with oseltamivir remained cost-effective, assuming a willingness to pay for health benefits at 26,1 74 Euro/QALY. Conclusion: Pharmacoeconomic analyses of influenza treatment with oseltamivir in an otherwise healthy Danish adolescent/adult population show that this treatment saves money for society and is associated with a relatively low cost from a health care payer's perspective. Treatment of influenza with oseltamivir would be cost-effective for healthy adolescents/adults in Denmark.