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Longitudinal Analysis of Generic Substitution


  • Dag Morten Dalen
  • Marilena Locatelli
  • Steinar Strøm


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 Group Munich.
  • Handle: RePEc:ces:ceswps:_3176

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    References listed on IDEAS

    1. Train,Kenneth E., 2009. "Discrete Choice Methods with Simulation," Cambridge Books, Cambridge University Press, number 9780521766555, March.
    2. John K. Dagsvik, 2002. "Discrete Choice in Continuous Time: Implications of an Intertemporal Version of the Iia Property," Econometrica, Econometric Society, vol. 70(2), pages 817-831, March.
    3. Andreassen, Leif & Di Tommaso, Maria Laura & Strøm, Steinar, 2013. "Do medical doctors respond to economic incentives?," Journal of Health Economics, Elsevier, vol. 32(2), pages 392-409.
    4. Dag Dalen & Kari Furu & Marilena Locatelli & Steinar Strøm, 2011. "Generic substitution: micro evidence from register data in Norway," The European Journal of Health Economics, Springer;Deutsche Gesellschaft für Gesundheitsökonomie (DGGÖ), vol. 12(1), pages 49-59, February.
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    Cited by:

    1. Elsayyad, May & Konrad, Kai A., 2012. "Fighting multiple tax havens," Journal of International Economics, Elsevier, vol. 86(2), pages 295-305.

    More about this item


    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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