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Longitudinal Analysis of Generic Substitution

Author

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  • Dag Morten Dalen
  • Marilena Locatelli
  • Steinar Strøm

Abstract

Using an extensive longitudinal dataset extracted from the Norwegian Prescription Database (NorPD) containing all prescriptions written in the period January 2004 to June 2007, we selected two particular drugs (chemical substances) used against cholesterol. The two brand-name products on the Norwegian markets were Provachol (atc code C10AA03) and Zocor (atc code C10AA01). The generics are Provastatine and Simastatine. The model accounts for taste persistence and is estimated on panel data. We find that prices have a negative impact on transitions in the sense that an increase in the brand price will reduce the transition from generics to brand and likewise an increase in the generic price will reduce the transition from brand to generics.

Suggested Citation

  • Dag Morten Dalen & Marilena Locatelli & Steinar Strøm, 2010. "Longitudinal Analysis of Generic Substitution," CESifo Working Paper Series 3176, CESifo.
  • Handle: RePEc:ces:ceswps:_3176
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    Keywords

    generics; substitution; microdata; random utility model; longitudinal data;

    JEL classification:

    • C35 - Mathematical and Quantitative Methods - - Multiple or Simultaneous Equation Models; Multiple Variables - - - Discrete Regression and Qualitative Choice Models; Discrete Regressors; Proportions
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
    • L65 - Industrial Organization - - Industry Studies: Manufacturing - - - Chemicals; Rubber; Drugs; Biotechnology; Plastics

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