• Pieter Dylst and Steven Simoens.
• Research Centre for Pharmaceutical Care & Pharmaco-economics, K.U.Leuven, Belgium. pieter.dylst@pharm.kuleuven.be
• Pharmacoeconomics. 2011 Oct 1; 29 (10): 875-82.

BackgroundAfter the expiry of patents for originator medicines, generic medicines can enter the market, and price competition may occur. This process generates savings to the healthcare payer and to patients, but knowledge about the factors affecting price competition in the pharmaceutical market following patent expiry is still limited.ObjectiveThis study aimed to investigate the relationship between the market share of generic medicines and the change of the medicine price level in European off-patent markets.MethodsData on medicine volumes and values for 35 active substances were purchased from IMS Health. Ex-manufacturer prices were used, and the analysis was limited to medicines in immediate-release, oral, solid dosage forms. Countries included were Austria, Belgium, Denmark, Germany, France, Italy, the Netherlands, Spain, Sweden and the UK, which constitute a mix of countries with low and high generic medicines market shares. Data were available from June 2002 until March 2007.ResultsMarket volume has risen in both high and low generic market share countries (+29.27% and +27.40%, respectively), but the cause of the rise is different for the two markets. In low generic market share countries, the rise was caused by the increased use of generic medicines, while in high market share countries, the rise was driven by the increased use of generic medicines and a shift of use from originator to generic medicines. Market value was substantially decreased in high generic market share countries (-26.6%), while the decrease in low generic market share countries was limited (-0.06%). In high generic market share countries, medicine prices dropped by -43.18% versus -21.56% in low market share countries.ConclusionsThe extent to which price competition from generic medicines leads to price reductions appears to vary according to the market share of generic medicines. High generic market share countries have seen a larger decrease in medicine prices than low market share countries.

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