International price comparisons for pharmaceuticals. Measurement and policy issues

Area of Science:

• Health Economics
• Pharmaceutical Policy
• Comparative Price Analysis

Background:

• Cross-national pharmaceutical price comparisons are vital for policy decisions and setting domestic prices.
• Existing comparisons often rely on limited product samples, potentially leading to inaccurate conclusions.

Purpose of the Study:

• To examine methodological issues in international pharmaceutical price comparisons.
• To assess the validity of policy conclusions drawn from these studies.
• To propose methods for more accurate average price level measurement.

Main Methods:

• Analysis of methodological challenges in international price comparisons.
• Evaluation of sample selection criteria and their impact on results.
• Discussion of standard index number methods for price comparisons.

Main Results:

• Valid average price levels require comprehensive, weighted product samples, not just identical products.
• Narrowly focused comparisons overstate international price differentials.
• International drug price comparisons are highly sensitive to methodological choices.

Conclusions:

• Policy conclusions from international price comparisons are only valid if based on representative samples and appropriate methodologies.
• Current methods often use unrepresentative samples, leading to overstatements of price differences.
• A broader inclusion of products, including generics and various forms, is necessary for accurate comparisons.